KEYWORDS: Amplifiers, Power supplies, Signal to noise ratio, Sensors, Signal detection, LIDAR, Photodetectors, Interference (communication), Electronics, Signal processing
It is of great significance to detect fast weak optical signal in the field of LiDAR. This article proposes a kind of broadband high-sensitive light pulse detection module that uses two-stage amplified circuit to achieve photoelectric conversion and amplification. The photoelectric detector is AD500-10 avalanche photodiode developed by the First Sensor Corporation. The computing amplifiers are LMH6629 and LTC6268, and the high-voltage power supply is the N1 series ultra-small high-voltage module power of Dongwen Company. The test results show that the module can enlarge the light pulse with the wavelength of 1064 nm, the repetition frequency of 10MHz, the average power of 1nW. The noise peak is about 50mV, and the output pulse width is about 14ns, which can avoid overlapping when the repetition frequency of light pulse is 10MHz.
Intensive study on the system noise of infrared detection system in optical satellites could provide an important for the
detection performance research and system design. The source of system noise of the infrared detection system in optical
satellites is analyzed and the models of system noise including electronic noise, background noise and optic system noise
are constructed. Firstly, the electronic noise model is built based by comprehensive analysis of system equivalent power
and scan parameters; then, the earth and atmosphere background noise is established on the basis of the Combined
Atmospheric Radiative Transfer software; lastly, the optic system heat radiation noise is studied using blackbody radiation
theory. On the basis of those models, the electronic noise, background noise and optic system noise are studied, furthermore,
the rule by which the system noise varies according to the changes of temperature and the influence on system noise of
each noise source is studied. The results show that, firstly, the optic system noise could be ignored when the system
temperature blowing 250K; secondly, the electronic noise is the primary source of system noise at 2.7μm and the
background noise is the primary source at 2.7μm and 2.85μm4.19μm.
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