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Blackbody Calibration Source
Precision Infrared Radiation Temperature Measuring Instrument
The blackbody calibration source is a device that emits thermal radiation with a known spectrum and intensity. It is mainly used to calibrate radiation temperature measuring instruments such as radiation thermometers and infrared thermal imaging cameras. Our blackbody calibration sources have the following advantages:

● Wide temperature range: from -50°C to 1600°C, covering various industrial and scientific applications.
● High emissivity index: close to 1, ensuring accurate and consistent measurements.
● Good target surface uniformity: less than 0.15°C deviation across the entire surface, minimizing errors and uncertainties.
● Good temperature control stability: less than 0.1°C fluctuation over time, maintaining stable performance and reliability.
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Product Profile
● The cavity of Dearto blackbody radiation source is designed with a spherical shape to ensure the high emissivity of blackbody radiation. The emissivity index can reach up to 0.997, which is close to the ideal blackbody.
● The unique air curtain technology prevents condensation from forming on the cavity surface during long-term low-temperature operation. The air curtain also acts as a thermal insulation layer, reducing heat loss and improving temperature stability.
● The super-large diameter cavity can accommodate most D:S radiation thermometers. It is a professional calibration equipment for calibrating various radiation thermometers.

Blackbody Calibration Source Product Selection Table

Product numbe DTR-50NG DTR-30NG DTR-800G DTR-1200G DTR-1600G
Temperature range (°C) -50~100 -30~100 50~800 100~1250 500~1600
Emissivity 0.998
Orifice size φ65 Φ50
Temperature control stability (℃/10min) ≤0.1 ≤ (0.1 and 0.1%t greater)
Target surface Uniformity(℃) ≤0.15 The greater of 0.15 and 0.15%t
Resolution (°C) 0.01 0.1
Dimensions (mm) 850×550×1100 550×600×800 730×780×1470
Product numbe DTBF-50G DTM-3050BSG
Temperature range (°C) 30~50 30~50
Emissivity 0.997 0.95
Orifice size Φ60 70×70
Temperature control stability (℃/30min) ±0.01 ±0.05
Dimensions (mm) 358×154×251 140×250×180
Product numbe DTSE-50G DTSE-50G
Temperature range (°C) 0~50(32~42) 0~100
Emissivity 0.999 0.999
Orifice size (mm) Φ10 / φ50 φ130
Temperature control stability (℃/10min) ±0.01 ±0.01
Dimensions (mm) 660(L)×540(W)×1120(H)


Blackbody Calibration Source: Guide

Blackbody Calibration Source is a high-precision device mainly used for calibrating radiation thermometers, infrared thermometers, infrared thermal imagers, radiometers, heat flow meters and calibrations for spectral analysis.

In this guide, you will learn all about.
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1: What is a Black Body Radiation Source?

Blackbody Calibration SourceAt its core, a black body radiation source is a fundamental concept in physics and engineering. It refers to an object that absorbs all incident radiation, regardless of its wavelength and direction, and emits radiation based solely on its temperature. This unique property makes black body radiation sources ideal for precise temperature calibration and measurement applications.

The term "black body" may be a bit misleading, as it doesn't necessarily mean the object is black in color. In fact, black body radiation sources can come in various forms, including cavities, furnaces, and other specialized devices designed to maintain a constant and uniform temperature.

Black body radiation sources are widely used across industries where precise and accurate temperature measurements are critical. They find applications in fields such as meteorology, material testing, astrophysics, and even in the calibration of infrared thermometers and thermal imaging devices.

2: What are the Principles and Characteristics of Black Body Radiation Sources?

2.1 The Principles of Black Body Radiation Sources

The principles governing black body radiation sources are rooted in the laws of thermodynamics and quantum mechanics. According to Planck's law and the Stefan-Boltzmann law, a black body emits radiation at a rate directly proportional to the fourth power of its absolute temperature. This means that as the temperature of a black body increases, the intensity of the emitted radiation rises exponentially.

Moreover, a black body absorbs all incident radiation, regardless of its wavelength and direction, making it an ideal reference for temperature calibration. This unique property ensures that a black body radiation source emits a continuous and predictable spectrum of radiation based solely on its temperature, providing a reliable and stable reference point for accurate temperature measurements.

2.2 Characteristics of Black Body Radiation Sources

Black body radiation sources exhibit several key characteristics that make them stand out among other temperature calibration methods:

2.2.1 High Accuracy and Precision

Due to their inherent properties, black body radiation sources offer unparalleled accuracy and precision in temperature calibration. The emitted radiation follows well-established physical laws, enabling precise measurements and minimizing calibration uncertainties.

2.2.2 Wide Temperature Range

Black body radiation sources can cover an extensive temperature range, from cryogenic temperatures to high-temperature applications. This versatility allows industries with diverse temperature calibration needs to rely on black body sources for various purposes.

2.2.3 Stability and Longevity

Once a black body radiation source reaches thermal equilibrium, it exhibits remarkable stability over time. This stability ensures consistent and reliable calibration results over extended periods, making them a cost-effective and long-lasting solution for temperature calibration requirements.

2.2.4 Traceability and Standards Compliance

Black body radiation sources are essential tools for establishing traceability in temperature measurements. They are commonly used to calibrate and validate other temperature sensors and instruments, ensuring compliance with international standards and regulations.

3: Why is the Blackbody Radiation Source the Calibration Standard for Infrared Thermometers?

Infrared thermometers have become indispensable tools for non-contact temperature measurements in various industries, from healthcare to industrial applications. But have you ever wondered how these devices ensure accurate readings? The answer lies in the use of blackbody radiation sources as the calibration standard for infrared thermometers.

3.1 The Reliability of Blackbody Radiation Sources

Blackbody radiation sources offer unmatched reliability in temperature calibration, making them the gold standard for calibrating infrared thermometers. As we discussed earlier, black body sources emit radiation based solely on their temperature, following well-established physical laws. This characteristic ensures a continuous and predictable spectrum of radiation, which serves as a stable reference point for calibration.

Infrared thermometers rely on detecting the thermal radiation emitted by the objects they measure. To ensure accurate temperature readings, these devices need a known and stable reference point. Black body radiation sources provide this reference with precision, allowing infrared thermometers to be calibrated against a source with a known temperature.

3.2 High Accuracy and Calibration Traceability

Calibrating infrared thermometers against black body radiation sources ensures high accuracy in temperature readings. The stability and reliability of black body sources lead to precise calibration, reducing measurement uncertainties and errors in infrared thermometer readings.

Moreover, calibration traceability is of utmost importance in various industries, especially those with strict quality control and safety requirements. Black body radiation sources, being a primary calibration standard, provide a traceable link to international standards, ensuring the accuracy and reliability of temperature measurements.

3.3 Wide Temperature Range Coverage

Black body radiation sources can cover a wide temperature range, which is crucial for calibrating infrared thermometers designed for diverse applications. Whether it's measuring extremely low temperatures in cryogenic applications or high temperatures in industrial processes, black body calibration sources offer the versatility needed for accurate calibration across different temperature ranges.

3.4 Ensuring Compliance with Regulations

Infrared thermometers are used in industries where compliance with regulations and standards is mandatory. Calibration against black body radiation sources helps ensure that the infrared thermometer meets these stringent requirements, allowing for consistent and reliable temperature measurements that comply with industry standards.

4: What are the Types of Blackbody Radiation Sources?

Blackbody Calibration SourceBlackbody radiation sources come in various forms, each designed to meet specific calibration and measurement needs. Understanding the different types of black body sources will help you choose the most suitable option for your application. Let's explore the main types of black body calibration sources below:

4.1 Fixed-Point Blackbody Calibration Sources

Fixed-point black body calibration sources, also known as ITS-90 (International Temperature Scale of 1990) black bodies, are designed to maintain a specific temperature at a well-defined fixed point. These sources are crucial for establishing and reproducing standard temperature points, such as the triple point of water (0.01°C) and the melting point of gallium (29.7646°C).

Fixed-point black body sources are typically used in high-precision calibrations where accuracy is paramount. They provide a reliable and stable reference for calibrating other temperature sensors and instruments, ensuring traceability to international standards.

4.2 Variable-Temperature Blackbody Calibration Sources

Variable-temperature black body calibration sources are versatile devices that allow users to set and control a wide range of temperatures. Unlike fixed-point sources, these black body devices offer flexibility in calibration across various temperature points within their operational range.

These sources are commonly used for calibrating infrared thermometers, thermal imaging cameras, and other temperature measurement instruments that require calibration at different temperatures. Their adaptability makes them essential tools in industries with diverse temperature calibration needs.

4.3 Cavity Blackbody Calibration Sources

Cavity black body calibration sources are designed as enclosed cavities with highly reflective inner surfaces. These cavities trap and absorb incident radiation, creating an environment where the emitted radiation is solely determined by the cavity's temperature.

These sources are widely used for their ability to provide a highly uniform and stable radiation field, making them suitable for calibrating infrared thermometers, thermal imagers, and radiation pyrometers. The uniformity of the emitted radiation ensures accurate and repeatable temperature measurements.

4.4 Integrating Sphere Blackbody Calibration Sources

Integrating sphere black body calibration sources consist of a spherical cavity coated with a highly reflective material on the inner surface. These sources offer excellent radiance uniformity, making them ideal for calibrating instruments that measure the total radiant power of a source, such as radiometers and photometers.

The spherical design ensures that the emitted radiation is evenly distributed throughout the cavity, providing a consistent reference for calibration purposes. Integrating sphere black body sources are valuable tools in industries where accurate radiometric measurements are essential.

5. What are the Advantages and Disadvantages of Each Black Body Radiation Source?

Each type of black body radiation source offers unique advantages and may have certain limitations. Understanding the pros and cons of each source will help you make informed decisions when selecting the most suitable black body calibration source for your specific application.

5.1 Fixed-Point Blackbody Calibration Sources


  • Extremely High Accuracy: Fixed-point sources provide exceptionally precise calibration at specific temperature points, ensuring reliable reference values for temperature measurements.

  • Traceability: These sources are fundamental for establishing traceability to international temperature standards, making them indispensable for industries with stringent quality control requirements.


  • Limited Temperature Range: Fixed-point sources can only provide calibration at specific temperature points and may not cover a wide range of temperatures.

  • Higher Cost: These sources involve intricate designs and materials, leading to higher costs compared to some other types of black body calibration sources.

5.2 Variable-Temperature Blackbody Calibration Sources


  • Versatility: Variable-temperature sources offer the flexibility to calibrate instruments across a wide range of temperatures, accommodating various calibration needs.

  • Cost-Effective: Compared to fixed-point sources, variable-temperature black body calibration sources may offer a more cost-effective solution for applications requiring calibration at multiple temperatures.


  • Slightly Lower Accuracy: Variable-temperature sources may have slightly lower accuracy compared to fixed-point sources due to the need for temperature adjustments over a range.

  • Calibration Complexity: These sources require careful calibration procedures to ensure accuracy across the entire temperature range.

5.3 Cavity Blackbody Calibration Sources


  • Uniform Radiation Field: Cavity sources provide highly uniform radiation fields, ensuring accurate and repeatable calibrations for various temperature measurement instruments.

  • Stability: Once in thermal equilibrium, cavity sources offer excellent stability, delivering consistent reference values for extended calibration sessions.


  • Limited Temperature Range: Cavity sources may have a constrained temperature range compared to variable-temperature sources.

  • Setup and Maintenance: These sources require careful setup and periodic maintenance to ensure optimal performance and accuracy.

5.4 Integrating Sphere Blackbody Calibration Sources


  • Radiance Uniformity: Integrating sphere sources offer excellent radiance uniformity, making them suitable for calibrating instruments that measure total radiant power.

  • Versatility: These sources can be used for a wide range of applications, from radiometry to photometry.


  • Slightly Lower Stability: Integrating sphere sources may have slightly lower stability compared to cavity sources.

  • Limited Calibration Range: These sources may have a restricted calibration range compared to variable-temperature sources.

6: Main Parameters of the Blackbody Radiation Source

Blackbody radiation sources are characterized by several key parameters that determine their performance and suitability for specific calibration and measurement applications. Understanding these parameters is essential for selecting the right black body calibration source for your needs. Let's explore the main parameters of a black body radiation source:

6.1 Temperature Range

The temperature range of a black body radiation source defines the minimum and maximum temperatures it can achieve and maintain. Some sources are designed for specific fixed points, while others offer a broad range of variable temperatures. Choosing the appropriate temperature range is crucial for calibrating instruments with different temperature measurement needs.

6.2 Emissivity

Emissivity refers to a material's ability to emit thermal radiation. A perfect black body has an emissivity of 1, meaning it emits radiation as per Planck's law. However, real black body radiation sources may have slightly lower emissivity values. Emissivity affects the accuracy and reliability of the emitted radiation and, consequently, the calibration precision.

6.3 Uniformity

Uniformity refers to the even distribution of temperature and radiation within the black body source. Sources with high uniformity ensure that the emitted radiation is consistent throughout the entire surface area, leading to precise and repeatable calibrations. Uniformity is crucial, especially for calibrating instruments that measure across the source's field of view.

6.4 Stability

Stability is a critical parameter for black body calibration sources. It refers to the source's ability to maintain a constant temperature and radiation output over extended periods. A stable source ensures consistent and reliable reference values during calibration, reducing measurement uncertainties and errors.

6.5 Precision

Precision indicates the accuracy and repeatability of temperature measurements obtained from the black body source. A high-precision source minimizes calibration errors and provides precise reference values, enhancing the overall accuracy of temperature measurement instruments.

6.6 Aperture Size

The aperture size of a black body radiation source defines the area from which the emitted radiation is collected. A larger aperture allows for calibrating instruments with wider field-of-view requirements. However, a smaller aperture may be preferred for higher accuracy measurements in specific applications.

Each of these parameters plays a crucial role in determining the performance and applicability of a black body radiation source. When selecting a source, it's essential to consider the specific calibration requirements and the instruments to be calibrated to ensure optimal calibration results and accurate temperature measurements.

7: How Does the Black Body Radiation Source Affect the Accuracy and Reliability of Temperature Measurement?

Blackbody Calibration SourceThe black body radiation source plays a crucial role in determining the accuracy and reliability of temperature measurement. Its design, parameters, and characteristics directly impact the precision and consistency of calibration, leading to trustworthy temperature readings. Let's explore how the black body radiation source affects temperature measurement:

7.1 Calibration Precision

The accuracy and stability of a black body radiation source are paramount for precise calibration. A well-calibrated black body source serves as a reliable reference, ensuring that temperature measurement instruments are accurately adjusted. The better the calibration precision of the black body, the more precise the temperature measurements will be on the calibrated instruments, leading to reduced errors in readings.

7.2 Traceability to Standards

Using a black body radiation source that is traceable to international standards is essential for compliance with quality control and regulatory requirements. Calibration against a traceable black body ensures that temperature measurements are consistent and conform to established standards, providing confidence in the accuracy of measurements and facilitating comparisons across different instruments and laboratories.

7.3 Minimizing Measurement Uncertainties

The uniformity and stability of the black body source contribute to reducing measurement uncertainties. A stable black body maintains a constant temperature and radiation output, ensuring consistent reference values for calibrating instruments. Moreover, uniform radiation across the source's field of view leads to consistent measurements, minimizing variations and uncertainties in temperature readings.

7.4 Enhancing Instrument Accuracy

Calibration against a high-precision black body radiation source enhances the accuracy of temperature measurement instruments. The accuracy of the calibration source directly translates to the accuracy of the calibrated instrument. A reliable black body source guarantees that temperature measurement instruments provide dependable and accurate readings, which is especially critical in industries where precision is essential for product quality and safety.

7.5 Ensuring Consistency and Reproducibility

The black body radiation source ensures consistency and reproducibility in temperature measurement across different instruments and calibration sessions. A well-characterized black body source provides consistent and repeatable reference values, allowing for dependable temperature measurements regardless of the instrument's location or the time of calibration.

8: Calibration Methods for Black Body Radiation Sources

Calibration is a crucial step in ensuring the accuracy and reliability of black body radiation sources. There are two main calibration methods used for black body sources: the radiation calibration method and the contact thermometer calibration method. Let's explore each method:

8.1 Radiation Calibration Method

The radiation calibration method involves comparing the radiation emitted by the black body source to a reference standard. This method utilizes highly accurate radiometers and spectrometers to measure the emitted radiation's intensity and spectrum.

During the calibration process, the black body radiation source is set to specific temperatures, and its emitted radiation is measured at different wavelengths. These measurements are compared to the values of a traceable reference standard to determine the source's accuracy and adjust any deviations.

The radiation calibration method ensures high precision and traceability, making it the preferred method for calibrating fixed-point black body sources and sources used in critical applications requiring extremely accurate temperature references.

8.2 Contact Thermometer Calibration Method

The contact thermometer calibration method involves using highly accurate contact thermometers, such as platinum resistance thermometers (PRTs) or thermocouples, to directly measure the temperature of the black body source.

In this method, the contact thermometer is placed in contact with the surface of the black body source, and its reading is recorded. The temperature indicated by the contact thermometer is compared to the set temperature of the black body source, allowing for adjustments to ensure the source's accuracy.

The contact thermometer calibration method is commonly used for calibrating variable-temperature black body sources. It offers a practical and straightforward approach to ensure the accuracy and reliability of sources used in applications where a broad temperature range is needed.

9: Applications of Blackbody Radiation Sources in Various Fields

Blackbody radiation sources find widespread applications across diverse industries and fields. Their ability to provide accurate and stable temperature references makes them indispensable for various purposes. Let's explore some of the key fields in which black body calibration sources are widely used:

9.1 Industrial Production

In industrial production, temperature calibration is critical for ensuring the quality and consistency of manufactured products. Blackbody radiation sources are used to calibrate temperature sensors and thermal imaging cameras employed in industrial processes, such as steel manufacturing, glass production, and semiconductor fabrication. Accurate temperature measurements help optimize production parameters, improve product quality, and enhance process efficiency.

9.2 Scientific Research

In scientific research, precise temperature measurements are fundamental for conducting experiments and studies in various fields. Blackbody radiation sources serve as reliable references for calibrating laboratory instruments, including spectrometers, radiometers, and thermal analysis equipment. These sources ensure the accuracy of research data, leading to more robust and trustworthy scientific findings.

9.3 Medical Care

In medical care, temperature is a critical parameter in various applications, from patient monitoring to medical device calibration. Black body calibration sources are utilized to ensure the accuracy of medical temperature sensors, infrared thermometers, and thermal imaging devices used in clinical settings. Accurate temperature measurements are essential for diagnosing medical conditions and providing optimal patient care.

9.4 Environmental Monitoring

Environmental monitoring relies on accurate temperature data to assess and analyze environmental conditions. Blackbody radiation sources play a vital role in calibrating temperature sensors and data loggers used in environmental monitoring stations. These sources ensure the precision and reliability of temperature measurements in applications such as climate research, weather forecasting, and pollutant monitoring.

9.5 Military Defense

In military defense applications, temperature calibration is crucial for various sensing and targeting systems. Black body radiation sources are used to calibrate thermal imaging cameras, infrared detectors, and other temperature-sensitive military equipment. Accurate temperature references enhance the performance and effectiveness of military defense technologies.

These are just a few examples of the many fields where black body calibration sources are widely used. Their significance in providing accurate temperature references extends to other sectors, including aerospace, energy, automotive, and more. In each of these industries, blackbody radiation sources contribute to better precision, reliability, and quality in temperature measurement and calibration practices.

10: Infrared Temperature Measuring Instruments Calibrated by Blackbody Radiation Sources

Blackbody radiation sources play a crucial role in calibrating a wide range of infrared temperature measuring instruments, ensuring their accuracy and reliability. Let's explore some of the key infrared temperature measuring instruments that can be calibrated using black body sources:

10.1 Radiation Thermometers

Radiation thermometers, also known as non-contact infrared thermometers or pyrometers, are widely used for measuring the temperature of surfaces from a distance. Black body radiation sources provide a precise and stable reference for calibrating these instruments, ensuring accurate temperature readings in various industrial and research applications.

10.2 Infrared Thermometers

Infrared thermometers are handheld devices commonly used for non-contact temperature measurements. These versatile instruments find applications in medical, industrial, and household settings. Calibration against black body radiation sources ensures the accuracy of infrared thermometers, enabling reliable temperature measurements in diverse environments.

10.3 Thermal Imaging Cameras

Thermal imaging cameras detect and display temperature variations across a scene, allowing for quick identification of hotspots and temperature anomalies. Calibration using black body radiation sources ensures the accuracy and consistency of thermal imaging cameras, making them invaluable for applications in predictive maintenance, building inspections, and security surveillance.

10.4 Radiometers

Radiometers are instruments used to measure the radiant flux or power of electromagnetic radiation, including infrared radiation. Calibrating radiometers against black body sources ensures precise and reliable measurements of infrared radiation, making these instruments essential for scientific research, environmental monitoring, and industrial processes.

10.5 Heat Flow Meters

Heat flow meters are used to measure the rate of heat transfer through a material or surface. Black body radiation sources provide accurate temperature references for calibrating heat flow meters, ensuring reliable and consistent measurements in applications such as building energy efficiency assessments and materials testing.

10.6 Spectrum Analyzers

Spectrum analyzers are used to measure and analyze the electromagnetic spectrum of a signal. Calibrating these instruments using black body radiation sources ensures accurate temperature measurements and enhances the reliability of spectral analysis in research, telecommunications, and signal processing applications.

In the End

By utilizing black body calibration sources, the accuracy and reliability of these infrared temperature measuring instruments are significantly enhanced, enabling industries and researchers to obtain precise and dependable temperature data for their diverse applications.

We take pride in offering high-quality blackbody calibration sources that cater to the calibration needs of various infrared temperature measuring instruments. For more information on our products and calibration services, please don't hesitate to get in touch with us.

This concludes our definitive guide to blackbody calibration sources. We hope this comprehensive resource has provided valuable insights into the significance and applications of black body radiation sources in modern temperature metrology.

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