Analysis of Infrared LED Chip Applications

Emitting infrared rays to control the corresponding controlled apparatus, which controls the distance and transmission power proportional. In order to increase the operating distance of the infrared, the infrared light-emitting diode in the pulse state, because the effective transmission distance of the pulsating light (modulated light) with the pulse of the wind is proportional to the call flow, simply to maximize the peak IP, can increase the emission of infrared LED light distance. Improve the method of Ip reduce the pulse duty cycle, ie compressed pulse width T, some TV infrared remote control, infrared LED pulse duty cycle of about 1/3-1/4; electrical products infrared remote control, the duty cycle is 1/10. Reduce the pulse duty cycle also greatly increased firing distance of the low-power infrared light-emitting diode. Ordinary infrared light-emitting diode, the power is divided into three categories small power (1mW-10mW), medium power (20mW-50mW) and high-power (50mW-100mW). To make the infrared light emitting diode to generate a modulated light, simply on the drive tube with a certain frequency of the pulse voltage.

 

Infrared light emitting diode emits infrared light to control the controlled device, controlled device in both infrared light power conversion components, such as the infrared receiver diode, phototransistor. Practical already infrared transmitter and receiver paired two tubes.

 

Infrared transmitter and receiver, there are two ways, one of which is direct-second is reflective. Direct-emitting tube and receiving tube relative placed at both ends of the launch with a controlled substance, a certain distance apart in the middle; reflective light tube and receiver tubes tied together, usually the receiver tube is always light, infrared light-emitting tube receive the infrared light reflected back before the light encounters the reflective material, the receiving tube. Infrared transmitter circuit of the double tube, can increase the transmission power, increasing the distance of the role of the infrared emission.

 

Can be obtained according to the different wavelengths in accordance with the characteristics of the infrared LED chip , a wider range of applications, for example:

1. Wavelength: 940nm, suitable for remote control, such as the remote control of household appliances;
Wavelength: 808nm, applicable to the medical apparatus, space optical communication, infrared lighting 2. Solid laser pump source
3. Wavelength: 830 nm, automated credit card system for high-speed road (the best night vision systems, can be seen on the die one o'clock red, better than better than 850nm)
4. Wavelength: 840nm, suitable for IR waterproof camera color zoom
5. Wavelength: 850 nm, suitable for cameras, video capture, digital photography, monitoring floor apartment intercom, burglar alarm, infrared waterproof
6. Wavelength: 870nm, suitable for shopping malls, crossroads camera ufeff