How to evaluate the quality of infrared filters?

 

Answer: To evaluate the quality of the filter, a professional spectral tester needs to be used for spectral testing. Only products that meet the customer's characteristic indicators can be considered qualified products.

 

 

What material is commonly used for infrared filters？

 

Answer: Commonly used material combinations are divided into near-infrared and mid infrared bands Ge SiO; Mid infrared -10 μ m band Ge ZnS; Far infrared -20 μ m band PbTe ZnSe; The infrared band of infrared thin film materials is very wide, reaching 0.76-30 μ m. Except for CsI, there is no material that can cover the entire band, and there are very few other available materials.

 

What is the function and principle of infrared filters?

 

Answer: According to the blackbody radiation law and physics research, the temperature of all objects in nature cannot be lower than -273 ℃, which is called absolute zero (0K). Therefore, the Kelvin temperature K=Celsius temperature ℃+273. All objects above absolute zero must radiate energy outward, producing infrared radiation; The higher the temperature of an object, the stronger its infrared radiation ability. Given the Planck formula: E=h ν, where E is energy, h Planck constant, and ν is frequency (=c/λ), i.e. E=hc/λ. The higher the temperature, the shorter the wavelength, and Wien's law λ m · T=2898 (μ m · K); When T=3000 K, λ m=0.97 μ m, and when T=5000 K, λ m=0.58 μ m. We can also calculate the corresponding temperature based on radiation energy or wavelength.

The infrared filter application field includes many aspects such as military, technology, medicine, and meteorology. In military, different engines or fuels have different temperatures, so the measured temperature can determine why the equipment is installed; In medicine, infrared radiation temperature measurement also applies relevant principles. The normal human body temperature radiates about 9.5 μ m of infrared radiation from the surface, and this wavelength has high energy, indicating a high body temperature.

In addition, Gas analysis equipment, surveillance cameras, infrared sensors, astronomical detectors, induction toilets, faucets, remote controls, thermometers, detectors, night vision products, touch screens, fingerprint recognition machines, facial recognition systems, infrared printers, infrared curtain wall products, infrared hand sanitizer devices... have the application of infrared filter technology, and RELATED PRODUCTS excels in functional applications.

 

 

What is the stability of a module related to?

 

Answer: The stability of the sensor module is related to factors such as its operating time, whether the current environmental temperature and humidity are stable, and whether gas sensors avoid vertical intake from the front.

 

What are the common faults of sensor modules?

 

Answer: Common faults in sensor modules mainly include inaccurate data (requiring power on and aging for a period of time), no signal output (whether the Supply voltage is correct), inaccurate accuracy (whether it is tested in a specific environment), incorrect data reading (whether it is parsed according to the data protocol requirements), and no data output (whether it is in automatic reporting mode).

 

 

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