Infrared emitting tubes, also called infrared emitting diodes, belong to the class of diodes. It can be widely used in infrared camera products such as infrared camera and audio output. The power of the chip inside is usually determined by the transmission interval, but the effect of the infrared surveillance camera is related to the angle of the infrared lamp, the number of the lamp group, the board and the lens number. Let's take a look at the detection methods and correct application of the infrared receiver manufacturer:
The polarity of the tube cannot be mistaken. Usually the longer pin is positive and the other pin is negative. If it is not recognized from the length of the pin (such as the shorted pin), it can be determined by measuring its forward and reverse resistance. When the measured forward resistance is small, the pin connected to the black test lead is the positive pole.
After measuring the forward and reverse resistance of the infrared light-emitting diode, it is also possible to speculate on the performance of the performance at a large level. Taking the 500× multimeter R×1k file as an example, if the forward resistance value is greater than 20kΩ, there is suspicion of aging; if it is close to zero, it should be scrapped. If the reverse resistance is only a few thousand ohms, or close to zero, the tube will be undoubted; its larger the reverse resistance, the smaller the leakage current, the better the quality.
Method for distinguishing infrared transmitting tube from infrared receiver manufacturer
People use the infrared emission tube and the infrared receiving tube as the infrared pair tube. The shape of the infrared pair tube is similar to that of a normal circular light emitting diode. It is difficult to distinguish the infrared emission tube and the infrared receiving tube from the initial contact with the infrared tube.
1. Use the three-meter meter to identify the Rxlk resistance of the 500-type or other type of pointer-type three-meter meter, and measure the inter-electrode resistance of the infrared pair tube to distinguish the infrared pair tube.
Criterion 1: The meter is measured under the condition that the end of the infrared tube is not reflected by the light. The forward resistance of the infrared tube is small, the reverse resistance is large, and the black meter is connected to the positive pole (long pin). The small (1k-20k) is the launch tube. The large forward and reverse resistance is the infrared receiving tube.
Criterion 2: When the black pen is connected to the negative pole (short pin), the resistance is large. The resistance is small and the pointer of the three-meter watch changes with the intensity of the light. The pointer swings to the receiving tube. Note: (1) The black meter is connected to the positive pole, and the red meter is connected to the negative pole to measure the forward resistance. (2) Large resistance means that the three-meter pointer does not move at all.
2. Power supply experiment method to determine
Use a light-emitting diode and a resistor only in series with the pair of tubes being tested, as shown in Figure 2. In the figure, the resistor acts as a current limiting resistor, and the resistance value is 220 ohms - 510 ohms. LED light-emitting diodes are used to visualize the operating state of the infrared transmitting tube under test. Use the remote control (TV remote control, etc.) to press the remote control button on the tube under test. When the LED is on, the tube to be tested is the infrared receiver tube. If it is not bright, it is an infrared emission tube.
The infrared transmitting tube working voltage and working current test can cumbersomely determine how good the work is. When measuring the working voltage at both ends of the pipe, it is usually zero when it is static (that is, when no button is pressed), and when it is dynamic (that is, when a button is pressed), it will jump to a smaller voltage value due to the coding of the remote control system. The mode, the construction of the drive circuit, and the operating power supply voltage are different. The voltage value is usually between 0.07 and 0.4V, and the test leads should be gently smashed. When measured with a digital multimeter, the measured value will generally be higher than the value measured by the pointer multimeter, usually between 0.1 and 0.8V. If the static needle is not static, the dynamic is not shaken, the static and the dynamic are under the static, the static and the dynamic are not, and the dynamic voltage and the static voltage are not significantly different, etc., it can be concluded that the infrared light-emitting diode works abnormally, if If the driving amplifier circuit is normal, the infrared transmitting tube is mostly damaged.
The infrared emission tube should be kept clean and in good condition. In particular, the spherical emission of the front end should not be contaminated with dirt or dirt, and it should not be damaged by friction. Otherwise, the infrared light emitted from the tube will reflect and The scattering phenomenon directly affects the propagation of infrared light. The lighter may reduce the flexibility of the remote control, reduce the control interval, and the heavy one may cause malfunction, and the remote control may fail.
The infrared emission tube must not exceed the limit value during the working process. Therefore, the model and parameters of the original tube should be paid attention to when changing the selection, and cannot be changed at will. In addition, the current limiting resistor of the infrared light emitting diode cannot be changed. Since the wavelength range of the infrared light is quite wide, the infrared transmitting tube must be paired with the infrared receiving diode, otherwise the flexibility of the remote control will be affected, and the control will be out of control. Therefore, when replacing the selection, it is necessary to pay attention to the wavelength parameters of the infrared light signal it radiates.
The infrared emitter tube package has a low hardness and its high temperature resistance is worse. To prevent damage, the solder joint should be kept away from the root of the lead, the soldering temperature should not be too high, and the soldering time should not be too long. It is best to use metal. The tweezers pinch the root of the pin to aid in heat dissipation. The shaping of the lead bend switch should be done before soldering, and the tube and pins should not be stressed during soldering.
The infrared emission tube is made of gallium phosphide and phosphorus arsenide data, and has a small volume and is positively driven to emit light. Low operating voltage, low operating current, average illumination and long life.
Infrared receiving head
It adopts small design and inner shield module package, and can do infrared decoding experiment, infrared remote control and so on. Remote control decoding and infrared remote control experiments are completed with the remote control. In the infrared remote control system as a receiving component is commonly used in 1, audio-visual equipment (such as VCD, DVD, DVB, TV, etc.) 2, household equipment (such as air-conditioners, electric fans, electric lights, etc.) 3, infrared remote control (such as toys, etc.) )
Infrared receiver manufacturer metal package infrared emission tube, suitable for all kinds of photoelectric conversion of automatic control instruments, sensors. Signal source for all types of photodetectors. Stable light can be obtained according to the driving method. Pulsed light, slowly changing light. Often used for control, alarm and other aspects. Holding point; using reflection function structure, strong optical power, low driving voltage, easy to match the transistor circuit. The structure is consolidating and resisting earthquakes. High reliability. Metallic glass packaged device with good wear resistance and temperature resistance.