Single infrared detector made with Relaxative ferroelectric crystal(PMNT) present excellence performance. In this paper include detector capacitance, characteristic of frequency--response, characteristic of detectivity. The measure result show that detectivity of detector made with relaxative ferroelectric crystal(PMNT) exceed three times than made with LT, the D*achieved than 1*109cmHz0.5W－1. The detector will be applied on NDIR spectrograph, FFT spectrograph and so on. The high performance pyroelectric infrared detector be developed that will be broadened application area of infrared detector.
It is obvious character that the chopper must be used in Uncooled pyroelectric imaging system. At present, three mainly
type chopper which are linear chopper, Archimedean spiral chopper and Fresnel zone plate array (FLA) chopper. The
FLA has some advantages than the others, which used diffraction solution. The paper report pyroelectric focal plane
binary optics chopper which was processed by laser direct writing etched Fresnel zone plate array shape, and draw the
test results: the sub-beam ratio of 1.2 x 103; diffraction efficiency more than 40%; non-uniformity: multi-point test better
than 10% in the FLA chopper.
A novel design of combination of hybrid system and zoom system in hyperspectral detection imaging is discribed based on the application of harmonic diffractive element (HDE) compared with conventional system. The principles of HDE and infrared zoom hyspectral detection system are presented and the results of a example design are given. It is show that the resolution of this hybrid system is improved and the light power received by Cassegrain system is enlarged. Wavefront aberrations are less than 1/4 wavelength and Modulation Transfer Function in the dual band on each zoom focus location approaches or attains the diffraction limit on 20 cycles/mm.