Infrared emitter tube is a common electronic component mainly used in fields such as infrared communication, infrared remote control, and human body sensing. Due to its common application characteristics, its high quality and reliability are crucial for the performance of electronic products. Therefore, it is crucial to use the correct method to determine the quality of infrared emission tubes. This article will introduce how to judge the quality of infrared emission tubes.

1、 Appearance judgment method

A simple and direct method is to judge the quality of the infrared emitter tube by observing its appearance. A regular infrared emitter tube has a long strip shape and one or more small hemispherical lenses inside, which are used to illuminate or concentrate light. Normally, a clean looking infrared emitter tube with no obvious scratches, cracks, looseness, or deformation, and no dust or stains on the lens surface, can be considered to be working properly.

If the appearance of the infrared emitter tube is not very normal, such as scratches, deformations, looseness, and stains on the surface, further inspection of its normality is needed. Scratches and stains can easily affect the light transmission effect of the lens, while deformation and looseness can lead to defocusing and unstable electrical performance. If the infrared emitter tube is continued to be used in this situation, it is likely to cause a decrease in photoelectric performance or simply not work, and may even cause damage to other electronic components.

2、 Electrical characteristic detection method

When judging infrared emission tubes, technical means such as electrical characteristic testing are usually required. This method includes three aspects: electrostatic testing, heating testing, and photodiode driving testing, mainly used to evaluate whether the electrical performance of infrared emitting tubes is normal.

(1) Static electricity test

Infrared emitter tube is a semiconductor device that, similar to typical integrated circuits, is susceptible to electrostatic interference, leading to operational failure. Therefore, during testing, it is necessary to ensure a dry testing environment and use appropriate tools such as electrostatic gloves, electrostatic pads, etc. to reduce electrostatic interference. For an electrostatic tester, the common method is to use a noise meter, first assemble it to detect gas and electrostatic interference signals, and then place the infrared emitting tube in an electrostatic environment for electrostatic testing. If the output current of the infrared emitter tube is stable and robust, it can be considered to have good quality.

(2) Heating test

The heating test method is mainly used to test the thermal sensitivity of infrared emission tubes. Generally, the temperature of the infrared emission tube can be raised to around 60 ℃ by a heater before testing. If the infrared emitter tube performs normally and the current is stable after heating, it can be considered to have good quality. Otherwise, it may cause changes in emission sensitivity or transistor saturation current and other current interruption phenomena. Pay attention to judging the temperature suitability, as excessively low temperatures may affect the performance assessment.

(3) Photodiode driver test

In the photodiode driving test, we commonly use an infrared emitter tube to excite the photodiode, which is used to estimate the light output power of the infrared emitter tube. Among them, photodiodes are commonly used optoelectronic devices for measuring light intensity and transmission distance. The basic process of this testing method is to connect the infrared emitter tube with a photodiode, and compare it with a standard light bulb at the photodiode end to estimate the performance of the infrared emitter tube.

3、 Summary

In short, judging the quality of an infrared emitter tube requires consideration of its appearance and electrical characteristics, among which the electrical characteristics are mainly determined through electrostatic testing, heating testing, and photodiode driving testing. Moreover, appropriate equipment, environment, temperature, and power should be selected during testing, and attention should be paid to preventing electrostatic interference and other interferences. If all the above tests perform normally, it can be considered that the infrared emission tube has good quality and can be used with confidence.

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