Can a Red Plastic Cover Improve an IR Sensor Performance?

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Using a red plastic cover over an IR sensor may impact its performance, depending on the filter's transmission characteristics. If the cover allows high transmission at the laser wavelength (around 904 nanometers) while blocking other wavelengths, it can enhance the signal-to-noise ratio. However, if the sensor already has a narrow band filter, adding a red cover may yield minimal improvements. The effectiveness of the cover ultimately hinges on its specific optical properties. Overall, the potential benefits of a red plastic cover on IR sensor performance are contingent on existing filtering mechanisms.
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IR Detector Question...

If someone take an IR sensor and puts a red covered piece of plastic over the sensor...is that really going to significantly affect the performance?

A friend of mine has a laser detector for road use and it appears to have a red plastic cover over the IR sensor...

Police operate at 904 nanometers...is a red plastic cover really going to improve the performance of the IR sensor by acting as a type of "filter"?

I'm having a hard time believing this...
 
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If the filter has high transmission at the laser wavelength and lower transmission at other wavelengths, then yes. The filter will increase the signal to noise ratio of the detected radiation. Unless, of course, if the laser detector already has a narrow band filter, then adding another one has marginal returns.
 

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