A two-color detector signal amplification control system and method

Abstract

The invention discloses a two-color detector signal amplification control system comprising a two-color detector working band selection switch, a pre-amplification circuit, a filter circuit, multistage amplification circuits, an A / D conversion circuit, a microprocessor and an upper computer which are connected in series in turn. Each amplification circuit of the multistage amplification circuits is connected with a zero setting offset signal via a D / A conversion circuit and used for providing a zero setting analog signal for the multistage amplification circuits. The beneficial effects of the two-color detector signal amplification control system and method are that the gear is adjusted timely and a control signal is updated when the two-color detector working band selection switch is switched so as to be suitable for two working bands. Noise is effectively suppressed when the amplitude of a weak signal is increased according to the detected noise voltage values of different bands and different gears so that the signal-to-noise ratio and sensitivity of instruments can be enhanced.

Description

technical field [0001] The invention relates to the technical field of two-color detectors, in particular to a signal amplification control system and method for two-color detectors. Background technique [0002] In the near-infrared spectrum analyzer, in order to make the working band of the instrument cover 600nm-1700nm, a Si-InGaAs two-color photodetector is usually used. The two-color detector uses two different detector combinations. From the structural point of view, the two-color detector adopts an up-and-down structure. The upper detector responds to short wavelengths, and the lower detector responds to long wavelengths that pass through the upper detector. Using Si-InGaAs dual-color detectors, the entire test band is segmented and received by photodetection elements of corresponding response bands, which can ensure a relatively high spectral responsivity in the entire measurement spectral range. After receiving the optical signal, the detector outputs a current sig...

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Problems solved by technology

In addition, the background noise caused by the stray light of the optical system and the dark current of the detector itself will seriously affect the signal acquisition after being amplified many times, especially when the weak light signal is detected, the background noise will drown the signal

[0006] The technologies disclosed in the above two patents do not consider the problem of the different spectral responsivity of the two bands. A single amplification control circuit is used to amplify the signals of the two bands, and it is even more impossible to quickly switch between the two working bands of the two-color detector. to switch

At the same time, it cannot meet the multi-level zero offset voltage at different gears under the two bands, and cannot effectively eliminate the influence of detector dark current noise

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