A Signal Acquisition Circuit of Grain Loss Sensor

Abstract

The invention discloses a signal acquisition circuit of a grain loss sensor. It includes a charge-voltage conversion circuit, an absolute value circuit, and a band-pass filter circuit connected in series in order to adjust the charge signal output by the grain loss sensor into a voltage signal suitable for transmission and processing, and to process the noise signal except the grain impact signal. Filtering; two cascaded A / D converters are controlled by the DSP microcontroller to synchronously collect the output signals of the 8*8 sensing modules conditioned by the signal conditioning unit, providing a reliable data source for the statistics of lost seeds; power supply The circuit supplies power to the signal conditioning unit and the signal acquisition circuit. The invention has the advantages of compact design structure, excellent performance and high cost performance, and provides possibility for popularization and use of grain loss sensors.

Description

technical field [0001] The invention relates to a signal acquisition circuit of a sensor, in particular to a signal acquisition circuit of a grain loss sensor. Background technique [0002] In order to improve the working quality and production efficiency of the combine harvester, it is necessary to detect the harvest loss of the combine harvester in real time. In recent years, some experts and scholars at home and abroad have carried out a series of research on the grain loss detection device applied to the combine harvester. Patent CN201611039729.5 proposes a PVDF-based double-layer criss-cross structure particle collision sensor. The device is installed at the end of the cleaning screen of the combine harvester, which can realize the identification and statistics of multiple grains lost at a certain moment. It makes up for the defect that most of the research on the grain loss detection device only detects a single grain. [0003] Patent CN201611039729.5 proposes the wo...

AI Technical Summary

Problems solved by technology

Sensors, charge amplifiers, and data acquisition cards need to be connected through complex cables, and external noise can easily cause crosstalk to beneficial signals through cables

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