基于吸收光谱的土壤速效磷检测系统

Based on Absorption Spectrum Monitoring System Phosphorus of Soil Available Phosphorus

开发了一种基于吸收光谱测量的土壤速效磷检测系统,主要由光学单元和信号采集单元组成。光学单元包括光源、入射和透射、光电转换器等。信号采集单元包括光源驱动电路,放大电路、A/D转换电路、液晶显示等。为了去除其他杂散光的影响,检测在暗盒中进行,光源发出的光经透镜聚光后入射到检测样品上,经透射后,来自样品的投射光直接传送到光敏传感器上,最后到信号采集单元接收处理。与土壤速效磷常规检测相比,该检测系统具有体积小、结构简单和低功耗等特点。

A soil available phosphorus system based on absorption spectra was developed.Mainly by the optical detector unit and the circuit modules,optical unit including the light source,the incident and transmission,media converter and so on.Signal acquisition unit including the light source drive circuit、amplifier circuit,A / D conversion circuit and iquid crystal display.Work carried out in the cassette to remove the influence of other stray light,the light emitted by the light condenser lens to the test sample after the incident,the transmission,the projection of light from the samples sent directly to the media converter,the resulting current longer be sent to the circuit unit amplifies,filters,A / D conversion,display and storage.Compared to soil P conventional detection,the test system has small volume,simple structure and low power consumption,etc.