How do u increase the sensitivity of an IR sensor?

[vivazza]

how do u increase the sensitivity of an IR sensor? what are the options?

 

[The Glom]

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.

 

[ravenprp]

There are several ways to increase the sensitivity of an IR sensor:

1. Adjust the gain: Most IR sensors have a gain adjustment feature that allows you to increase the sensitivity. This can be done by turning a knob or using a potentiometer to adjust the gain level.

2. Use a lens: Adding a lens to the IR sensor can help focus the incoming IR radiation, increasing its sensitivity. This is especially useful for long-range detection.

3. Increase the power supply: Providing a higher voltage to the sensor can improve its sensitivity. However, be careful not to exceed the maximum voltage limit of the sensor.

4. Reduce interference: IR sensors can be affected by external light sources, such as sunlight or artificial light. Minimizing these sources of interference can help increase the sensor's sensitivity.

5. Use a reflective surface: Placing a reflective surface behind the IR sensor can help increase its sensitivity by reflecting more IR radiation towards the sensor.

6. Adjust the detection range: Some IR sensors have a range adjustment feature that allows you to change the distance at which the sensor can detect objects. By adjusting the range, you can increase the sensitivity for objects within a shorter distance.

It's important to note that increasing the sensitivity of an IR sensor may also increase its susceptibility to noise and false triggers. Therefore, it's important to find a balance between sensitivity and reliability for your specific application.