Investigation Of Transient Thermal-Radiation Time-resolved Spectrum Measurement And Its Temperature Measurement Method And Technology

When matter is impacted by shock compression with hundreds Pa, its temperature may be thousands karat, even it may be ten thousand karat, and there is strong spectrum to radiate at the same time. This radiation is mainly made from the thermal radiation of matter , and radiating transition of atoms and molecules of matter. By investigation of radiating spectrum of matter with transient shock compression, we not only can measure the temperature of matter, but also can know the object equation of matter, and we can know the microstructure of atoms and molecules of matter and their interacting with shock compression. For investigating thermal character changing of matter with shock compression, we need to measure the time character of radiating spectrum of matter with shock compression and its temperature, that is to measure transient time-resolved spectrum and its temperature.In this paper, the time-resolved spectrum measurement instrument has been improved and optimized based on what we have done , the real experiments for measuring time-resolved spectrum of Xe flash-lamp and time-resolved spectrum of matter under pulse laser shocking were made. For getting temperature of transient thermal-radiation, lodging the method of measuring the temperature of the time-resolved thermal-radiation with least duple multiply theory, and measuring the temperature of Wu lamp with this method, the results showed that the method have best properties for measuring temperature, and measuring the temperatureof time-resolved spectrum of matter under pulse laser shocking with this method, getting the primary results.In this method of measuring time-resolved spectrum, a special light beam modulator translates the time-distribution of an optical spectrum into a space-distribution of light intensity of the light beam, and the space-distribution spectrum is dispersed by a multi-spectrometer, then it is detected by an ordinary 2-D CCD array detector.The key technology of measuring time-resolved spectrum is to design and make the special light beam modulator that is used to the time-resolved spectrum detecting. The special light beam modulator is a disc that rotates at high speed, symmetrically along its diameter is respectively arranged a slit and a small hole, the slit is used to modulate light beam, the small hole is used to the synchrosystem and measure speed of modulator.In this method of measuring temperature, when the measuring results of time-resolved spectrum have been completed, computing the fit spectrum of corresponding Planck bold-radiation with least duple multiply theory, the temperature is measured.The time resolution of 43μs and 1 78 μs, the wavelength range of 350-800nm and the wavelength resolution of 0.3nm have been reached in the experiment of Xe flash-lamp spectral measuring. The time resolution of 100μ s is obtained in the experiment of spectral measurement of matter under shock compressed with the same wavelength detecting range and the same wavelength resolution. The error of temperature measuring is less than 1%, measuring process is convenient and computing is easy, the range of measuring is from 2000k to 5000k.This method and the instrumentation design will be get wider application in future in many research areas of shock compression physics, interactions of high-power laser with material, chemical dynamics, life science and so on.