Pre-amplifier for weak optical signal of magnetic field inertial measuring device

Abstract

The invention discloses a pre-amplifier for a weak optical signal of a magnetic field inertial measuring device. The pre-amplifier comprises two silicon photodiodes, an automatic depolarization amplifying module for one route of differential signals and two single-channel monitoring modules for two routes of optoelectronic signals, wherein current output ends of the two silicon photodiodes are reversely connected in parallel so as to supply the differential signals, and signals of the other two current output ends are respectively taken as input signals monitored by a single end; the automaticdepolarization amplifying module comprises a transimpedance amplifying circuit and a direct current proportion-integral feedback loop and is used for realizing a low-noise amplifying function in alternating components of a light current; and the two single-channel monitoring modules are respectively used for monitoring original light intensity information of the two silicon photodiodes in real time. According to the pre-amplifier, an automatic depolarization low-noise amplifying function and a real-time monitoring function of two routes of original signals are realized in a frequency responserange of 10k-100k by virtue of the two silicon photodiodes.

Description

technical field [0001] The invention belongs to the technical field of photoelectric measurement. Specifically relates to a preamplifier for a weak light signal of a magnetic field inertial measurement device. Background technique [0002] The nuclear magnetic resonance gyroscope has the precision of an optical gyroscope, the volume of a microelectromechanical (MEMS) gyroscope, and the development potential of low cost. It is currently the fastest-growing class of atomic spin gyroscopes. The magnetic field inertial measurement device described in the present invention is realized based on the principle of nuclear magnetic resonance gyroscope. Most of the devices use a beam of detection light to detect the Larmor precession information of the atoms in the gas cell, and the photodetector converts the light signal into an electrical signal for processing by the control circuit. The preamplifier of the light detection signal is the forerunner of the whole circuit, and its perf...

AI Technical Summary

Problems solved by technology

Due to the inevitable azimuth error between the optical components (half-wave plate and polarization beam splitter prism) used in this detection method, there is a DC bias component in the weak optical signal, which suppresses the AC component in the differential light intensity signal. extraction and amplification of

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