Researching On The Calibration Technology Of UV-VUV Detector

Recently, people have realized the value of UV-VUV wavelength, the application researching in this field has developed. Space UV remote sensing has been an important way of understanding the nature. A lot of phenomenon can be observed at UV wavelength, for example, the spectrum peak value of radiation by lots of star is in the UV-VUV wavelength, the constitution of the star and the physical, chemical changing on it can be known though the researching on the radiation spectrum. By detecting the atmosphere scattered light, glow and polar light, the interacting mechanics of the solar and the earth can be known, and the real-time monitoring to the air environment can be realized by conversing the content of all kinds of microcontent air and gasoloidWith the continuous developing of the quantitative remote sensing researching and the accuracy of radiation intensity and spectral resolution testing, it requires a high accuracy spectral responsivity standard to calibrate all kinds of sensor, and evaluate their testing accuracy,long-term stability and date comparative. Basing on the theory, there are two way to realize the absolute spectral radiation testing:the fist way basing on the radiation light source, the second way basing on the radiation detector.Changchun Institute of Optics, Fine mechanics and Physics, Chinese Academy of Sciences is an important radiation calibration department. The standard detector, standard light, standard diffuser and the integrating sphere have been introduced.The standard light had been used to calibrate the irradiance and radiance responsivity of the space remote sensing instrument and the radiance of the integrating sphere and so on. The calibration method of standard light is so simple, and easy to realize the continuous standard transmission at the whole wavelength. But some uncertain factor also have been leading-in(the stability of the light, the characteristic of the optics element transmission, the modified factor of the light size). The segment of the calibration method of standard detector is less than the standard light method, and the uncertain factor is also fewer, it has advantage in improving the calibration precision. But the calibration channel of method is so finite, so it can not cover the whole wavelength which needs to be calibrating.For proving the accuracy of the date of the standard light calibration method, this paper makes deep researching on the standard detector calibration and the working of the two method comparing. On the basic of finishing the studying of the calibration method and principle, the device of UV detector spectrum responsivity calibration and VUV detector quantum efficiency testing had been established. The uncertainty of the two devices is 1.7% and 2.3%. The High Accuracy UV Radiometer(HAUR) whose core element using NIST standard detector has been established. It has stable performance, compact construction. And the responsivity standard had been deduced by using the standard of he NIST standard detector. The uncertainty of the HAUR is 1.3%.The HAUR had been used to calibrate the he irradiance of the unknown light, the radiance of the integrating sphere and the irradiance and radiance responsivity of space remote sensing instrument, the calibration date and uncertainty analyzing of the standard light method and the standard detector method had been compared at the four spectrum channel. The comparison shows that the calibration date of the two methods is uniformity in the range of the uncertainty. So the accurate of two methods had been proved.