Signal acquisition circuit for grain loss sensor

Abstract

The invention discloses a signal acquisition circuit for a grain loss sensor. The circuit includes a charge-voltage conversion circuit, an absolute value circuit and a band-pass filter circuit which are connected in series in order, conditions charge signals output by the grain loss sensor to voltage signals suitable for transmission and processing, and filters out noise signals except grain impact signals. A DSP microcontroller controls two cascaded A / D converters to synchronously collect output signals of an 8*8 sensing module conditioned by a signal conditioning unit, thereby providing a reliable data source for the statistics of grain loss. A power supply circuit supplies power for the signal conditioning unit and the signal acquisition circuit. The signal acquisition circuit is compact in structure, excellent in performance and high in cost performance, and provides possibility for popularization and use of the grain loss sensor.

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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