Shock wave overpressure signal conditioning system

Abstract

The invention discloses a shock wave overpressure signal conditioning system, comprising a pressure sensor, a weak signal amplifier module and an ADC signal conditioning module. The pressure sensor is used for obtaining a shock wave overpressure signal. After the shock wave overpressure signal is applied to the pressure sensor, the pressure sensor generates corresponding charges. The weak signal amplifier module is used for obtaining charge signals generated by the pressure sensor and converting the charge signals into voltage signals. Different amplification times are realized through software programming. The ADC signal conditioning module is used for converting positive and negative voltage signals output by the weak signal amplifier module into positive voltage signals with unchanged waveforms and filtering high-frequency components, thereby reducing noise inference. According to the shock wave overpressure signal conditioning system provided by the invention, an integrated size of a sensor element and a signal conditioning circuit is reduced to several-millimeter magnitude, a signal to noise ratio is improved, and moreover, the great convenience and application space are provided for a test technology.

Description

technical field [0001] The invention belongs to the technical field of test and measurement, in particular to a shock wave overpressure signal conditioning system. Background technique [0002] At present, piezoelectric sensors are mostly used in piezoelectric measurement, and traditional piezoelectric sensors mostly use tourmaline as the sensitive element. In the past research, it was found that the size of the wafer directly affects the measurement waveform, and the size of the crystal is limited to a small range of variation, and It is not suitable for the case where the size of the sensitive element is large. As a sensitive element, tourmaline mainly considers the structure and surface coating materials, and the oil seal method is mainly used on the surface coating materials. The tourmaline crystal is sealed in a polyethylene tube filled with silicone oil, and the crystal passes through two leads. First connect a built-in amplifier and then connect the coaxial cable, wh...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a shock wave overpressure signal conditioning system to solve the problem that the charge amplifier in the sensor and signal conditioning part of the existing overpressure measurement system is large in size and expensive, and the sensor and the charge amplifier need to go through a long process. It is easy to introduce the problem of noise signal when connecting the wires

Images