Self-adaptive amplifying and filtering system for laser energy measurement of back reverse calorimeter

Abstract

The invention relates to a self-adaptive amplifying and filtering system for laser energy measurement of a back calorimeter, which comprises a calorimetric detector, an impedance matching device, a front programmable gain amplifier, a programmable switch capacitance low-pass filter, a post programmable gain amplifier, a signal acquisition and control module and a gain and bandwidth control module, wherein the signal acquisition and control module analyzes and processes an acquired signal by adopting a self-adaptive frequency spectrum analysis method and transmits processing results to the gain and bandwidth control module; and the gain and bandwidth control module downloads the processing results to the front programmable gain amplifier, the post programmable gain amplifier and the programmable switch capacitance low-pass filter. The self-adaptive amplifying and filtering system has the benefits that the gain of all amplifiers and the bandwidth of the filter are realized through online adjustment, the use is convenient, and the signal to noise ratio of an output signal is improved while the environmental noise is effectively restrained.

Description

technical field [0001] The invention relates to an adaptive amplification and filtering system for laser energy measurement of a reverse card meter. [0002] Background technique [0003] At present, the amplification and filtering device used in the laser energy measurement of the back-to-back card meter is composed of a fixed-level gain amplifier and a fixed-bandwidth filter. The bandwidth adjustment of the filter and the gain adjustment of the amplifier need to be realized by manually configuring the switch before use. In order to adapt to the frequency change of the interference source and the change of the energy of the input signal, it is necessary to adjust the bandwidth of the filter and the gain of the amplifier. The prior art has the following deficiencies in the adjustment process. [0004] First of all, when adjusting the bandwidth of the filter and the gain of the amplifier, it is necessary to manually configure the switch, which is very inconvenient to operate...

AI Technical Summary

Problems solved by technology

[0004] First of all, when adjusting the bandwidth of the filter and the gain of the amplifier, it is necessary to manually configure the switch, which is very inconvenient to operate and use; secondly, in order to adapt to the frequency change of the interference source and the change of the input signal energy, the filter needs to be adjusted several times. Bandwidth and gain of the amplifier, and each adjustment needs to disassemble the device, which not only causes difficulties for the application of the device, but also causes difficulties for the reliability and maintainability of the device; third, there are optional filters in the existing filter structure. The number of bandwidth series is small, and the continuous adjustment of the filter bandwidth cannot be realized. At the same time, the complex circuit structure also introduces more noise, which reduces the noise suppression ability of the circuit.

Images