Cavity Ring-Down Spectroscopy Device and Method Based on Logarithmic Operational Amplifier

Abstract

The invention belongs to the technical field of laser spectrum, in particular relates to a cavity ring-down spectroscopy device and a cavity ring-down spectroscopy method based on a logarithm operation amplifier, and solves the technical problems that the precision of a measurement result is difficultly improved and a device is complicated and relatively high in cost in a cavity ring-down spectroscopy technology at present. The device comprises a laser emission device, wherein the emergence end of the laser emission device is connected with an acousto-optical modulator through an optical fiber; a coupling lens and an optical cavity are arranged on an emergence light path of the acousto-optical modulator in sequence; a photoelectric detector is arranged on the emergence light path of the optical cavity; the signal output end of the photoelectric detector is divided into two paths, the first path is connected with the control end of the acousto-optical modulator through a threshold circuit, and the second path is connected with the logarithm operation amplifier. According to the technical scheme, the device is simple and convenient to operate, a large quantity of manpower and material resources do not need to be consumed, and the device is easily accepted by most of application departments due to the cost and the convenience of use.

Description

technical field [0001] The invention belongs to the technical field of laser spectroscopy, in particular to a cavity ring-down spectroscopy device and method based on a logarithmic operational amplifier. Background technique [0002] Cavity ring-down spectroscopy (CRDS) is a highly sensitive absorption spectroscopy technique, which is often used for trace gas detection and lens reflectivity measurement. According to Beer Lambeau's law, when the beam intensity is I 0 When the light passes through the gas-absorbing medium, the intensity will be attenuated due to the absorption of the medium, and the detected transmitted light intensity will decrease, and the larger the optical path length, the more obvious the intensity decrease. Absorption spectroscopy technology is to invert the concentration of the absorbing medium by comparing the relationship between the initial light intensity and the transmitted light intensity. Among them, the cavity ring-down spectroscopy technology...

AI Technical Summary

Problems solved by technology

[0016] The present invention provides a cavity ring-down spectroscopy device and method based on a logarithmic operational amplifier in order to solve the technical problems that the accuracy of the measurement results of the current cavity ring-down spectroscopy technology is difficult to improve and the device is complicated and the cost is high.

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