How do u increase the sensitivity of an IR sensor?

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To increase the sensitivity of an IR sensor, one effective method is to use an NPN IR photo-transistor in a Darlington arrangement with another sensitive NPN transistor. This setup involves creating a collector-base connection on the second NPN transistor, which enhances the overall sensitivity. When IR light activates the phototransistor, it can turn on the second transistor if there is sufficient potential across its collector-emitter junction. This configuration amplifies the response to IR signals, making the sensor more effective. Implementing this design can significantly improve the performance of IR sensing applications.
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how do u increase the sensitivity of an IR sensor? what are the options?
 
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If you're talking about an NPN IR photo-transistor, use it in a darlington arrangement with another sensitive NPN transistor.

In other words, use it to make a collector-base connection on another NPN transistor. Then, if there's a potential across the second transistor's collector-emitter junction any IR on the phototransistor will "turn on" the NPN transistor.
 

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