Research On Spectral Measurement Technology Of Infrared Focal Plane Detector Based On Michelson Interferometer

Infrared focal plane detectors have a wide range of applications in military(infrared guidance,night vision,camouflage recognition,lidar,target search and tracking,etc.),agriculture,industry,medicine and other fields.No matter what application,you should accurately understand infrared focal plane detection.The performance parameters of the infrared detector,and the spectral response is one of the important performance parameters of the infrared detector.The spectral response of an infrared detector refers to the response rate of the detector to incident radiation of different wavelengths.The relative spectral response determines the overall performance,application direction and system sensitivity of the detector.Therefore,it is of great significance to study the relative spectral response of infrared focal plane detectors.Aiming at the shortcomings of the monochromator-based spectrum test system that the test speed is slow,the spectrum response of the specified wavelength can only be tested,and the spectral signal-to-noise ratio in the long-wave direction is low,this paper designs and implements the spectrum of an area array infrared detector based on a Michelson interferometer.The test system uses the Michelson interferometer,infrared light source,infrared focal plane detector,standard pyroelectric detector,data acquisition card,step scan control module and other hardware in Bruker V80 Fourier spectrometer to realize infrared focal plane detection Driver and data acquisition of the device,design the interference data acquisition software by ourselves,and then process the acquired interferogram through matlab(curve smoothing,FFT transformation,phase correction,apodization function,etc.)The system was used to test the relative spectral response of the refrigerated(uncooled)long-wave and mid-wave infrared focal plane detectors.Finally,the data measured in the experiment were processed and analyzed.The results measured by the spectrum test system designed in this paper were compared with the results measured by the monochromator-based spectrum test system,and it was found that the spectrum based on the Michelson interferometer The test system has the advantages of high signal-to-noise ratio(especially in the long-wave direction),large luminous flux,wide spectral range,and fast test speed.In addition,the possible factors that cause system errors are analyzed,such as detector blind elements,system noise,measurement errors,etc.,especially the influence of the tilt of the moving mirror of the Michelson interferometer on the test results.The simulation is carried out using matlab,and it is found that the moving mirror tilt will cause a decrease in the signal-to-noise ratio of the spectrum.