Signal acquisition and processing device for impulse type grain flow sensor

Abstract

The invention proposes a signal acquisition and processing device for an impulse type grain flow sensor. A double parallel beam sensor and two sets of processor systems are combined; the device includes two mixed signal microcontrollers, an integrated single-power instrument amplifier and a mixed signal micro-controller form a two-stage amplification circuit, and the mixed signal micro-controllerand an embedded 32-bit processor form a two-stage processing frame. The device can ensure the signal conditioning performance and meanwhile adapt to the situation that different excitation voltage causes different common mode voltage and the change of the signal input range; single parallel beam impulse type grain flow signal acquisition and double parallel beam impulse type grain flow signal acquisition are compatible, the synchronization of data acquisition at a time is ensured by sharing serial port signals, and the yield calculation errors are reduced. The floating-point calculation is supported, the complex signal processing algorithm can directly run, the traditional host computer processing scheme is avoided, the portability of a system is improved, input of 6-36V DC voltage is supported, and the device can adapt to the situation that a vehicle-mounted power supply is unstable in power supply.

Description

technical field [0001] The invention belongs to the field of precision agriculture and intelligent agricultural machinery, in particular to an impulse type grain flow sensor signal acquisition and processing device. Background technique [0002] Obtaining crop yield information and establishing yield distribution maps are an important basis for realizing scientific control of inputs and formulating management decision-making measures in the process of crop production, and are also the core technology and prerequisite for realizing precision agriculture. Grain yield measurement system is an important tool for obtaining crop yield, which has a history of nearly 30 years. In principle, the grain flow sensor, the core component of the grain production measurement system, can be divided into two types based on mass flow and volume flow. In contrast, the former has better accuracy and stability, so the mainstream production measurement systems in Europe and the United States are ...

AI Technical Summary

Problems solved by technology

On the one hand, this architecture increases the computing burden on the upper computer, on the other hand, it reduces the portability of production measurement sensors, and indirectly leads to the lack of compatibility between mainstream commercial products, which creates obstacles for the standardization of key components of intelligent agricultural machinery.

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