The infrared emission tube (IR LED) also known as infrared emitting diode，belonging to the class of diode. It is the electric energy can be converted into near infrared (not visible) directly and the radiated light emitting device.
SMD infrared emission diode
Infrared emission control (IR LED), also known as infrared emitting diode, is a diode category. It can be directly converted into electrical energy near-infrared light (invisible light), and can radiate out of the infrared lighting emitting device is mainly used in a variety of optical switch, a touch screen and the remote transmitter circuit. The structure of Infrared emission are similar compare with the principle and common light-emitting diodes, but use different semiconductor materials. Infrared light emitting diode usually use gallium arsenide (GaAs) and gallium aluminum arsenide (GaAlAs) and other materials, the use of ir LED strip and transparent or light blue, black resin package.In line infrared emission tube
The infrared transmitting tube shape is similarity compare with the Common LED, but infrared can be emits infrared lighting. The pressure drop of voltage about 1.4V, the operating current is generally less than 20mA. In order to adapt to different work voltage, a current limiting resistor in series of circuit loop. The infrared transmitting to control the controlled device corresponding, proportional to their distance and transmit power control. In order to increase the control distance of infrared light, infrared light emitting diode is working on the pulse condition,
proportional to their pulse of light (modulated light)and peak current pulse , just try to improve the peak Ip, can be increase the transmitting distance of infrared light.
Improved Ip method, is try to reduce the pulse duty ratio, namely the compressed pulse width of T, some infrared remote control device of color TV, the infrared emitting tube work pulse duty ratio of about 1/3-1/4; some electrical appliances infrared remote control, the duty ratio is 1/10. emitting power of low power infrared LED is greatly increased when Reducing the pulse duty . Common infrared light emitting diode, the power is divided into small power (1mW-10mW), power (20mW-50mW) and high power (above 50mW-100mW) three categories. To make the infrared light emitting diode produces a modulated light, only in the drive pipe pulse voltage with a certain frequency.
Infrared light emitting diode emitting infrared to control the controlled device, controlled device has a corresponding infrared light electric conversion elements, such as infrared receiving diode, a photoelectric triode. Emission and receiving of infrared utility has paired two tubes.
The parameter
Transmitting distance, the emission angle (15 degrees, 30 degrees, 45 degrees, 60 degrees, 90 degrees, 120 degrees, 180 degrees), light intensity, wavelength emission. Above is the physical parameters need to be aware of its electric performance parameters: the market commonly used diameter 3mm, 5mm for low power infrared launching tube, 8mm, 10mm for power and high-power transmitting tubes. Small power transmitting tube forward voltage: 1.1－1.5V, current of 20mA, in the power of forward voltage: 1.4-1.65V 50 – 100mA, high-power transmitting tubes for the forward voltage: 1.5-1.9V200 350mA. Our Electronic made 1 －10W high-power infrared emission tube can be applied to the infrared lighting monitoring.
Application of infrared LED
The infrared transmitting and receiving in two ways, one is the direct style, the second is reflective. The direct type refers to the light-emitting tube and the receiving tube ends are relatively placed in emission and controlled object,a certain distance from the middle; reflective light tube and receiver tube means tied together,
usually receiving tube always without light, only to encounter a reflection in the infrared light emitted by light emitting diodes, receiving tube receives the infrared light is reflected back. Just work. Dual infrared transmitter circuit, can increase the transmission power, increase the role of the infrared emission distance.