LIGHT SCATTERING TYPE PARTICLE SENSOR

摘要

A light scattering type particle sensor capable of sensing very small particles by converting the light of low energy density emitted from a light source into the light of high energy density. In the light scattering type particle sensor for sensing the particles by receiving the scattering light (Ls) generated by irradiating the light (Lb) to the particles contained in a fluid, the light (Lb) is the light in which the wavelength lambda of the light (La) emitted from a light emitting diode (11) is changed into the wavelength of lambda/2 when transmitted through a non-linear optical crystal (13), and the light (Lb) of the wavelength of lambda/2 is reciprocated between a reflecting film (13d) formed in the non-linear optical crystal (13) and a reflecting mirror (14) facing each other across a particle sensing area (8).