A constant wavelength light absorption sensor was developed using the feature that the biologically active formazane solution extracted from the waste water has the maximal absorption peak for the light with wavelength 485 nm.

The new optical sensor system for the ESDD monitoring of transmission equipment is described in the paper,which gained the data of temperature、humidity 、optical parameter by terminals.

Based on the properties of ENZ materials, two potential applications for optical sensor and optical power divider are suggested and numerically studied.

This paper introduces the sensors that are used in the products with ozone technology and expounds the principle of the temperature sensors,light sensors and infra-red far-controlling technology which are usually used in the products with ozone technology.

A newstyle nonlinear light sensor of adjustable threshold has been fabricated by packaging a silicon photoelectronic negative resistance device and an LED together,and using the photobistable and selflocking characteristics of the negative resistance device.

The array is known as a light sensor and consists of a linear row of closely spaced photo detectors.

A photo sensor is introduced, its construction priciple and how XJ 2 type temperature control instrument performs the control of the rolling temperature of rolled drills.