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  • IR thermometers

    From RichD@21:1/5 to All on Sat Jun 26 10:29:19 2021
    I ​wonder about those IR thermometers so prevalent 
    during the past year.  Previously, I recall seeing them 
    at deli salad bars, used to monitor the sour tureens.

    I understand the physics, the relationship between 
    spectrum and temperature. What is the accuracy,
    considering the problems of focus and reflection,
    and ambient noise?

    What's the internal sensor? 

    --
    Rich

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  • From Lu Wei@21:1/5 to RichD on Mon Jun 28 10:25:55 2021
    On 2021-6-27 1:29, RichD wrote:
    I ​wonder about those IR thermometers so prevalent 
    during the past year.  Previously, I recall seeing them 
    at deli salad bars, used to monitor the sour tureens.

    I understand the physics, the relationship between 
    spectrum and temperature. What is the accuracy,
    considering the problems of focus and reflection,
    and ambient noise?

    The accuracy is not good to my impression, but it's just for quick
    scanning. And they usually have no emissivity setting (I guess they are
    fixed to 0.95 or so).

    What's the internal sensor? 


    --
    Regards,
    Lu Wei
    IM: xmpp:luweitest@riotcat.org
    PGP: 0xA12FEF7592CCE1EA

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  • From Phil Hobbs@21:1/5 to Lu Wei on Thu Jul 1 21:25:05 2021
    Lu Wei wrote:
    On 2021-6-27 1:29, RichD wrote:
    I ​wonder about those IR thermometers so prevalent
    during the past year.  Previously, I recall seeing them
    at deli salad bars, used to monitor the sour tureens.

    I understand the physics, the relationship between
    spectrum and temperature. What is the accuracy,
    considering the problems of focus and reflection,
    and ambient noise?

    The accuracy is not good to my impression, but it's just for quick
    scanning. And they usually have no emissivity setting (I guess they are
    fixed to 0.95 or so).

    What's the internal sensor?



    So much of the 'precautions' of the last year or more have been pretty
    much theatre. Even if the IR gun was perfectly accurate, and
    irrespective of my state of health, the temperature of my forehead when
    I've just come in from outside is going to be quite different between
    January and July.

    Cheers

    Phil Hobbs

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