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4471 Views 1 Reply Latest reply: Feb 28, 2014 12:49 PM by davecuthbert RSS
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Jan 26, 2014 2:11 PM

Infrared object detector - color sensitivity

I'm currently using a Lite-on phototransistor (LTR-4206E) and a Lite-on LED (LTE-4206) as part of a object recognition scheme. These are infrared devices. The idea is to detect the reflected infrared emissions from the object as they pass by. I cannot use a method where the infrared LED and phototransistor are facing each other, so I have to use reflected emissions.

 

My problem is that the system is much more sensitive to white objects as opposed to black or gray objects.

 

Is there a reasonable simple (and cheap) way to resolve this? I cannot put reflective tags or anything else on the objects, and I cannot increase the sensitivity because I will begin to detect objects that are further away than I want to detect.

 

Thanks in advance for your help.

I'm currently using a Lite-on phototransistor (LTR-4206E) and a Lite-on LED (LTE-4206) as part of a object recognition scheme. These are infrared devices. The idea is to detect the reflected infrared emissions from the object as they pass by. I cannot use a method where the infrared LED and phototransistor are facing each other, so I have to use reflected emissions.

 

My problem is that the system is much more sensitive to white objects as opposed to black or gray objects.

 

Is there a reasonable simple (and cheap) way to resolve this? I cannot put reflective tags or anything else on the objects.

 

Thanks in advance for your help.

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