散射法检测液体中微小颗粒浓度的研究

The Research On Detecting Tiny Particles Concentration based on Scattering Method

利用液体中微小颗粒对光的散射作用原理,设计了一种检测测量溶液中颗粒浓度的装置。该检测装置选用波长为830nm的红外LED作为光源,在与入射光成90°的散射角处测量散射光强度,以光敏二极管为光电接收器,并通过信号处理将检测得到的光信号转换为电信号,从而获得与液体中的固体颗粒浓度相关的电信号。由于液体中颗粒浓度对散射光强具有决定作用,进而得到待测液体中固体颗粒浓度与电信号的关系。为避免环境光造成干扰,系统采用不透光暗腔,并采用非接触式测量。

A colloidal concentration measurement setup is constructed based on the tiny particles in solution scatter light. In this setup, an LED with central emitting wavelength 830nm is employed. At the 90 degree, the scattered light is collected and measured using a photosensitive diode as a detector. Then the optical signal is transferred to the electrical signal. Since the colloidal concentration is related to scattered light intensity, the output electrical signal is also related to the colloidal concentration. To avoid the disturbing signal by surrounding light, a nontransparent cavity with non-contact measurement is utilized.