In research of the square wave laser by smooth Q-switch cavity dumping, getting the stable synchronized signal from the multi-channels laser power supply with serious electromagnetic interference, by using of photoelectric coupling.

The principle and characteristics of photoelectric coupling technology are applied in the fault diagnosis of circuit to solve the problem of interference in the fault diagnosis of multi-power supply control system.

Due to the photoelectricity coupling technique used in the ampifier, the leakage of current is weak, so the system is very safe for patients, CMRR>102dB, the system has strong capability of restraining interfere.

The linear application of photoelectric coupler in medical instruments;

Two photoelectric couplers with the same characteristic and one integration operational amplifer are used to make up circuits of feedback and output,realize the uncoen-ground transmission of analog signals in multi-power supply system,and work out the solution of common-mode interference in the course of signal transmission.

In this paper, the photoelectric coupler s apply in the system with band transmissio experiment has been presented.

Effect of space radiation to the optocoupler performance;

Study of organic optocouplers;

Structural design and package characteristics of optocoupler;

Owing to the volt-ampere characteristic of light-emitting diode and phototransistor in the photocoupler, there is a nonlinear distortion in its isolated transmission process.

On the basis of introducing photocoupler,the paper focused its description on a kind of pulse drawworks sensor,which was designed under the photo coupling technology, made a exposition to processing circuits of sensor pulse signals and lab detecting technology of sensor technical indexes and probed into methods of real time measuring well depths while drilling.

Main factors affecting the breakdown properties of insutalors are analysed, on the basis of which a high voltage isolating photocoupler is designed and fabricated.