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TMP006 wavelength range

Other Parts Discussed in Thread: TMP006

I am playing around with your TMP006EVM eval kit, and have verified that the sensor sees my skin temperature as 33 C, which is the expected value.  By the way, you might mention to users trying out your eval kit that the sensor noise (baseline drift) is much improved if you shield it from direct drafts (eg. put it in a plastic bag.)

Your SBOU107 "User's Guide" says "TMP006 uses IR wavelengths from 4 μm to 8 μm."  Can you elaborate on this? Is the front window of the device a sharp cutoff filter passing only 4-8 um? Is there a wavelength spectrum plot available showing relative response?   If I put an IR-type fresnel lens in front of it as typically used in passive IR motion detectors, will I have much lower sensitivity (since those plastics have a transmission window from 8-14 um, but block 6-8 um, and transmit about 55% from 4-6 um).

In the "Layout Guidlines" on p.6 of the same document,it states "The IR thermopile sensor in the TMP006 is as susceptible to conducted and radiant IR energy from below the sensor on the PCB as it is to the IR energy from objects in its forward-looking field of view"  -so the backside is just as sensitive as the frontside (?)

  • Hello John,

    Yes, the TMP006 does behave much better if it is shielded from air drafts.

    The spectral response of the TMP006 is based on the absorption of the IR energy on the sensor surface, I have attached an image of the spectral tranmission below.  It's important to notice that the highest transmission is roughly 50% because half of the IR energy is reflected off of the silicon surface.  This is corrected for in the object temperature calculation math.

    You may want to look into polypropylene materials which do pass IR energy in the 4-8um range although there is some loss as you've mentioned.

    Regarding the layout guidelines:  Yes, the TMP0006 is just as sensitive on the back-side as it is on the front-side, that's why so much effort had to go into the layout to get proper results from the device. 

     Best Regards,
    Collin Wells
    Precision Analog

     

  • I need to protect the tmp006 device in my application.

    What poly material is suggested. I plan to use a plano surface. .060" thick. flat surface .

    Any studies on material applications for IR transmission?

  • Colin,

    my customer asks to show a spectral absorbtion characteristics of TMP006. Can I show your answer with transmission figure as an answer to their question?

  • Hello Dmitry,

    Yes, please feel free to share the information with your customer.

    Best Regards,
    Collin Wells
    Precision Analog

  • Collin;

    Can't a coating be sputtered on to the surface to make it "black" in the IR? This would extend the IR response to a longer wavelength and increase the sensitivity in human-body temperature measurements, etc. I was wrong about thinking the TMP006 spectral response was limited by a window.

  • Hi Neil,

    Actually you weren't  wrong.  The spectral response is limited by the silicon lid of the wafer level package that the TMP006 is packaged in.  So the IR response is limited by the silicon packaging of the device itself.

    Regards,
    Collin Wells
    Precision Analog

     

     

  • Dear,

     I’m planning to use the tmp006, your documentation(s) are missing some data, especially the wavelength spectrum (in micrometer or manometers), or sensitivity for this product, do you have such data? Can you provide it?

    Also, what are the effects of cooling for such device, example, a Pelletier Effect module? Especially in reducing the noise figure

     What is the real sensitivity of the device?  

     Thanks for any help

     Daniel

  • Hello Daniel,

    Wavelength spectrum is in micrometers and the graph is shown at the beginning of this post. The sensitivity of the device is 7-8uV/degree C at room temperature. This value is listed in Page 3 of the data sheet. 

    The device is a silicon thermopile based Si sensor based on Seebeck effect. There is not need for cooling the device, if are referring to cooled IR temp sensors. 

    Regards,

    Abhi

  • Thanks Abhi, 

    i have a major problem with this sensor, ... the speed... i need to find something faster... but still in the IR range...

    thanks again

    Daniel