Three functions of light activated triode

A, non-contact measurement speed

Torque sensor is installed on the axis of rotation with 60 slot wheel speed, the sensor shell device of a composed of light emitting diode and the photosensitive triode trough type photoelectric switch frame, wheel speed of each tooth will be blocked by light emitting diode, light activated triode will output a high level, when the light through a slot into the window of the light tube, photosensitive tube it outputs a low level, each round of rotation can be 60 pulse, thus, the number of pulses per second detected exactly equal to the speed in every minute.

Second, the photoelectric isolation

Light activated triode role is another transmission signal, the optical coupler (optical coupler, abbreviations for OC) which is also called photoelectric isolator, optical coupling for short. The medium of optical coupler to transmit electrical signals. It has good isolation effect to input and output electric signal. Optocoupler generally consists of three parts: optical transmitter, optical receiving and signal amplification. At the same time also has good electrical insulating ability and anti-interference ability; Strong ability to suppress common-mode and reliability. In the monolithic switch power supply, may constitute a light coupling feedback circuit with linear optical couplers, through adjusting control side to change the duty cycle, current to achieve precision voltage regulator.

Third, measuring the brightness

Way is to install the counter in the circuit, the brightness difference was able to maintain a certain time to close the fluorescent lamp force. Design a circuit, we can apply light activated triode make fluorescent lamp can not be normal boot or be forced to shut down so as to achieve the purpose of saving energy. Of course, the feasibility of this method from now see is not very high, the circuit will cost may be high will affect the implementation. But by light activated triode features for the purpose of saving.