Infrared imaging detection technology has been widely used. In the process of using infrared images for target observation, a large amount of typical target infrared radiation characteristic data is needed as infrared reference information to eliminate interference factors such as environment, time period, and false targets to achieve accurate target identification. The acquisition of typical target infrared radiation characteristic data is to use infrared characteristic measurement equipment to accurately measure the measured target under various external environments and conditions, and finally form the available target infrared radiation characteristic data through data analysis and arrangement. Since infrared target characteristic data needs to be acquired in the field, these devices generally have the characteristics of working environment in the field environment, multiple types of measurement targets, long measurement distance and wide measurement space. Therefore, in order to eliminate the influence of external environmental factors and accurately obtain the infrared characteristics of the target, it is necessary to calibrate the key parameters of the large-aperture infrared characteristics measurement equipment on the test site. However, there is currently no field calibration capability for large-aperture infrared characteristic measurement equipment, which has a negative impact on the application of infrared imaging detection systems. In order to solve the above problems, this paper develops a large-aperture long-focus optical system in an external field environment, which mainly includes a high-temperature standard infrared radiation source, a large-aperture off-axis primary mirror, a secondary mirror, and a target. After the development was completed, it was applied in the external field environment to calibrate a certain high-resolution infrared characteristic measurement equipment, and the relevant data were analyzed. The analysis results show that the uniformity measurement uncertainty is better than 0.4K (k=2), the distortion measurement uncertainty is better than 1% (k=2). And a good application effect is achieved.
KEYWORDS: Black bodies, Temperature metrology, Infrared radiation, Control systems, Temperature sensors, Neural networks, Infrared imaging, Imaging systems
With the further development of the technology, the application of infrared imaging detection system environment gradually extended to the external field, high altitude, near space and outer space, etc. Its working temperature range is getting wider and wider, low temperature can reach -50°C below, high temperature can reach 70°C above. Infrared imaging detection system needs to meet the requirements of quantitative detection technology in a wide temperature range to ensure the completion of corresponding functions. In order to ensure that the infrared detection system can perform performance testing, radiometric calibration and quantitative traceability in the whole temperature range, this paper developed a large-aperture high-precision fixed-point infrared radiation source with a wide temperature range, and its phase change medium is water. It mainly includes diaphragm assembly, radiation cavity, inner wall coating of radiation cavity, heating assembly, temperature control assembly, etc. After development, verification tests were carried out in high and low temperature environment, and the following indexes were achieved: effective emissivity ≥0.999, cavity opening diameter ≥60mm, and temperature measurement uncertainty: 5mK (k=2). It has been proved that it can meet the measurement and testing requirements of infrared detection system under wide temperature range.
The importance and necessity of high temperature dynamic measurement techniques is analyzed in the paper. According to the requirement of solid rocket engine test, infrared radiation thermometry technology, colorimetric measurement technology and multi-wavelength radiation thermometry technology are used in the high temperature dynamic measurement device. The device worked well under harsh environment in the test site. Testing data is analyzed during the experiment and the results match the theoretical calculation. Application analysis of high temperature dynamic measurement techniques is made. It is clearly that optical measurement technology is quite prospected in the model test.
KEYWORDS: Calibration, Infrared radiation, Radiometry, Black bodies, Signal detection, Sensors, Temperature metrology, Environmental sensing, Signal processing, Optical design
In this paper, the demand for value transfer and traceability in the quantitative measurement of infrared radiation characteristics in the field environment is analyzed, and the necessity and significance of value transfer and traceability are expounded. According to the requirements of infrared radiation quantity transfer and traceability in the field environment, the development of infrared radiation quantity transfer radiometer is completed, which mainly includes athermalized optical system, diaphragm module, chopper, reference blackbody module, infrared detection module, signal acquisition system and so on. It is applied in the field environment. By comparing the measurement method with the standard blackbody radiation source, the quantity transfer of a certain type of field target characteristic measurement equipment is carried out, and the relevant data are analyzed. The analysis results show that the measurement uncertainty is better than 1 % by traceability in the field environment. Therefore, the measurement uncertainty of the infrared radiation characteristics in the field can be effectively improved by transmitting the infrared radiometer through this value and cooperating with the standard blackbody radiation source, and the traceability chain of the infrared radiation value in the field environment can be improved, which has good application value.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.