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Liquid Sensing

SensorIR

Hello TT Electronics,

 

I recently saw an article about your OPB350 liquid sensor.  Can this sensor detect the presence of opaque liquids?  What about bubbles in a clear liquid?  Can you give me an overview of how this product works.

 

Thank you,

Jon

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    Hello Jon, thank you for your question. 

    Identification of different fluids can be accomplished by monitoring the output current of the phototransistor.  For example, if the initial state is clear fluid, the output would be highest.  If the material on the fluid is black, the output would be lowest.  The output is analog; hence it is possible to detect states in between clear and black. 

    The light emitted from the LED has a typical peak wavelength around 890nm.  As long as the material is able to attenuate 890nm, then the output will change.  For example, you may be able to detect Hematocrit percentage on blood because red blood cells tend to diffuse more near infrared light.The sensor also is able to detect bubbles as an absence of material however; the bubble(s) needs to be the same size as the inner diameter of the tube in order for the sensor output to be consistent.

    Please let me know if I can be of further assistance.

     

    Walter Garcia Brooks

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    Hello Jon, thank you for your question. 

    Identification of different fluids can be accomplished by monitoring the output current of the phototransistor.  For example, if the initial state is clear fluid, the output would be highest.  If the material on the fluid is black, the output would be lowest.  The output is analog; hence it is possible to detect states in between clear and black. 

    The light emitted from the LED has a typical peak wavelength around 890nm.  As long as the material is able to attenuate 890nm, then the output will change.  For example, you may be able to detect Hematocrit percentage on blood because red blood cells tend to diffuse more near infrared light.The sensor also is able to detect bubbles as an absence of material however; the bubble(s) needs to be the same size as the inner diameter of the tube in order for the sensor output to be consistent.

    Please let me know if I can be of further assistance.

     

    Walter Garcia Brooks

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