Miniature multichannel sensor signal preprocessing module

Abstract

The invention relates to a miniature multichannel sensor signal preprocessing module which has a modular circuit form and an independent packaging structure. The miniature multichannel sensor signal preprocessing module has advantages of relatively high integration degree, small size, high suitability for different hardware platforms and different embedded data acquisition systems with different structure forms, and high application flexibility. The signal preprocessing module has a unified electrical interface. When the type and the number of the sensors of the data acquisition system change,changing of the signal preprocessing module is required, and re-designing of the printed circuit is not required. The signal preprocessing module realizes high integration degree of a signal processing circuit between a sensor and an A / D conversion circuit, thereby supplying power supply excitation and signal processing for multiple types of sensors, and reducing complexity in hardware designingof the data acquisition system. The signal preprocessing module optimizes and solidifies the principle and printed circuit board designing of different types of sensor signal processing circuits. Noise of a signal chain is effectively reduced, and total precision of the data acquisition system is improved.

Description

technical field [0001] The invention relates to the application field of an embedded data acquisition system, in particular to a small multi-channel sensor signal preprocessing module. Background technique [0002] In some small aircraft tests, it is necessary to use an embedded data acquisition system to collect environmental parameters such as vibration, shock, overload, and pressure during aircraft launch and flight. The sensor completes the conversion of physical signals such as acceleration and pressure to electrical signals, and the converted electrical signals are sent to the A / D converter for conversion into digital quantities after filtering, amplitude adjustment, zero adjustment and impedance conversion. [0003] The function of the signal preprocessing circuit is to complete sensor power supply, output signal filtering, amplitude adjustment, zero adjustment and impedance transformation. At present, there are generally two ways to implement the sensor signal prepr...

AI Technical Summary

Problems solved by technology

At present, there are generally two ways to implement the sensor signal preprocessing circuit. One is a general-purpose signal conditioner, but the existing signal conditioner has the following defects: First, because of its large size, In the system; secondly, the interface of the signal conditioner is a general interface, and the embedded data acquisition system changes the interface according to the actual situation, so that the general interface of the signal conditioner cannot be connected with the interface of the embedded data acquisition system; thirdly , the installation method of the signal conditioner prevents it from being installed in the embedded data acquisition system

There are many defects in this design method: 1) When the type and quantity of sensors change, the corresponding preprocessing circuit needs to be adjusted, which leads to the redesign of the printed board; Correspondingly design power circuits with various output specifications, which increases the complexity of printed board design; 3) Analog circuits and digital circuits are designed on the same board, and digital signals will interfere with analog signals, which increases the noise of analog signals and reduces system performance. Sampling accuracy

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