Signal acquisition and processing method of direct reading spectrometer

Abstract

The invention discloses a signal acquisition and processing method of a novel direct reading spectrometer, and is suitable for characteristics of a periodic spark light source of the direct reading spectrometer. The method comprises the steps: firstly, according to a split optical path structure of the direct reading spectrometer, determining a space position of a split optical path corresponding to each wave band of to-be-detected light, and placing a light detection module corresponding to each to-be-detected light path wave band; carrying out phase inversion treatment of electrical signals outputted by the light detection modules, then sending to a signal channel of a phase-locked amplifier, and carrying out band-pass filtering and amplification, to reduce spurious noise; sending a periodic signal having the same frequency as that of a to-be-detected signal into a reference channel, and adjusting the phase position to be the same as that of the to-be-detected signal; carrying out cross-correlation operation of outputted signals of the signal channel and the reference channel, and inhibiting noise having no correlation with the reference signal; and extracting low frequency components outputted by a correlator, to obtain the amplitude value and phase position information of the to-be-detected signal. The method can shrink the size of an optical system, reduces the investment of a detector, has high detection sensitivity and low noise, and can improve the resolution of the direct reading spectrometer.

Description

technical field [0001] The invention belongs to the field of spectrum detection, and more specifically relates to a method for collecting and processing optical signals of a novel direct-reading spectrometer based on the combination of a photodetector and a lock-in amplifier. Background technique [0002] In recent years, with the vigorous development of the steel industry, high-precision analysis and detection systems are the main means of quality control in steel production and processing, and precise analysis and detection must rely on sophisticated testing methods. Among them, the direct reading spectrometer is the main analysis, detection and calibration instrument in the steel industry. The light source of modern direct-reading spectrometer adopts spark excitation light source, that is, the processor controls the circuit to perform periodic charge and discharge operations, thereby generating periodic sparks between the sample and the electrode, and the spectrum of the ...

AI Technical Summary

Problems solved by technology

This solves the problem of low overall integration of the direct reading spectrometer detection system

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