The electrical properties of infrared light emitting diode -
Infrared light emitting diode is 3mm in diameter, 5mm is a small power infrared, diameter is 8mm, 10mm is a medium power and high-power transmitting tubes. Small power transmitting tube forward voltage: 1.1-1.5V, current: 20mA. In power transmitting tube forward voltage: 1.4-1.65V, current between 50-100mA. High power transmitting tube forward voltage as 1.5-1.9V, current between 200- 350mA 。use ir strip wavelength: 980nm, 940nm,880nm, 850nm, 870Nnm in general.
the relationship between infrared emission tube Power and infrared emission tube wavelength is: 850nm>880nm>940nm. Infrared light emitting diode –principle
The infrared light emitting diode principle is the method of infrared emitting and receiving, can be divided into two types, one is the direct type, two is a reflective.
refers to a light-emitting tube and receiver tube placed in opposite ends of a controlled substance with the launch .the middle of a certain distance. Infrared light emitting diode reflection type refers to the light emitting tube and a receiving tube tied together, usually receiving tube operation always without light, the luminous tube to emit infrared light encounters reflector, infrared ray receiving reflected back to work. The use of dual infrared emission circuit , can increase the transmission power to a great extent, increase the emission distance of led infrared.
Infrared light emitting diode - distance
Infrared light emitting diode radiation has a very strong when in use, depending on the optical axis distance varies, due to the different light-receiving element and the distance change,the amount of change in infrared light-emitting diode light receiving element between the incident light and the infrared LED showed a certain characteristic inversely as the square of light to measure the distance. To control the corresponding controlled device with emitting infrared, the distance between the control and the emission power is proportional. In order to increase the distance of the actual control of infrared, infrared emitting diode in a pulse state during, between the effective transmission distance and pulse peak current is proportional to control the pulsating light.
Infrared led light emitting diode application
Infrared light emitting diode in daily use, some TV infrared remote control, The work pulse duty cycle of infrared LED between about 1 / 3-1 / 4, the infrared remote control of electrical equipment, the duty ratio is: 1/10. In use, the pulse duty cycle can be reduced if a small-power infrared light-emitting diodes on the transmission range greatly increased.
Common infrared light-emitting diodes, the power divided into small power: between 1mW-10mW, the power: between 20mW-50mW,
high power 50mW-100mW above three categories. The above is specific introduction of the infrared light emitting diodes, hoping to serve as a reference.