Pyrometer with humidity meter.

Discussion in 'Electronics Resources' started by Santhakumar, Aug 4, 2016.

  1. Santhakumar

    Thread Starter Member

    Mar 17, 2015
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    Hi

    Could anyone suggest a Pyrometer (Remote temperature measuring device, capable of measuring above 350 Degree Celsius) with embedded humidity meter also.

    I need a pyrometer for my project and thinking of buying a product which can also measure humidity and may be ambient temperature also.
    if anyone knows product with this combination please suggest me.

    Thanks.
     
  2. jpanhalt

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    Jan 18, 2008
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    It seems you are asking for a lot from the humidity measurement. How do you define it at temperatures above the boiling point of water and at atmospheric pressure?

    What methods have you considered for measuring humidity?

    There is actually quite a bit written on measuring humidity at temperatures in excess of water's boiling point. Here is just one link to an instrument manufacturer: http://www.macinstruments.com/relatv_c.html

    John
     
    Last edited: Aug 4, 2016
  3. Santhakumar

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    Mar 17, 2015
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    Hi jpanhalt,

    My Requirement is just remote temperature measuring product. let's say i have a laser gun which can measure temperature by pointing it at hot surface to be measured. But i don't want to measure the humidity of that hot surface. i can use it to measure humidity when it is not been used for temperature measurement. i just asked a product with this added feature.

    Hope you would understand my requirement.
    And thanks for your link. it made me to understand facts about humidity.

    Santhakumar.
     
  4. Alec_t

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    Sep 17, 2013
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    How do you plan to use a laser for humidity measurement?
     
  5. Santhakumar

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    Mar 17, 2015
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    Hi ,

    laser Beam only for Temperature ..To measure humidity there will be a sensor..but suggest me if both modules is in single product.
     
  6. jpanhalt

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    How do you measure temperature with laser? The radiation from a hot object is very non-laser like.

    Are you sure the laser you see is not just to show approximately where the IR detector is pointed?

    John
     
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  7. wayneh

    Expert

    Sep 9, 2010
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    I think you could use spectroscopy to measure the density of water vapor and air separately but you'd probably need a mirror on your target to reflect your beams. I'm not aware of any such instrument.

    I agree the laser is more likely a targeting aid than anything to do with the measurement.
     
  8. Santhakumar

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    Mar 17, 2015
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    Hi,

    Laser is a spectrum which is just a near Infrared spectrum..and which is transmitted from the infrared gun and reflected back from the object. this reflected waves detected by IR detector and so it measures temperature from this reflected radiation.

    [​IMG]
     
  9. Sensacell

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    Jun 19, 2012
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    Ummm. no.

    The device has a visible laser which is only used to point the device at the desired measurement spot, it has NOTHING to do with the temperature measurement.

    It actually measures "black body" IR radiation from the target, very long IR wavelengths.
     
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  10. jpanhalt

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    I think you have a serious misunderstanding of how you pyrometer works. Here is the briefest description from Wikipedia:
    Your pyrometer does not measure a reflected laser beam. It detects the infrared emitted by the object it is pointed at.

    John
     
  11. Santhakumar

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    Mar 17, 2015
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    Is that so..thinking that it is measuring laser radiation since it is also falling on IR spectrum..could you attach the link that what you are stating So that i could get more on it.
     
  12. Sensacell

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  13. jpanhalt

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    Now he has that link twice.

    John
     
  14. Santhakumar

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    Mar 17, 2015
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  15. wayneh

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    If you can see the beam, it isn't IR anyway. QED
     
  16. Santhakumar

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    Mar 17, 2015
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  17. jpanhalt

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    As several of us have said, you are wrong about your pyrometer using laser emissions to determine the temperature of the object at which it is pointed. The laser on that instrument is nothing more than a visible pointer. The infrared light that is emitted from an object, which is proportional to its temperature, is not laser light. It is emitted in all directions. That pyrometer detects that light. Have you read and understood that Wikipedia link on black-body radiation?

    As to your comment immediately above, that sentence makes no sense to me in the context of those comments.
    1) The linked article is accurate and does not support your contentions. Nevertheless, you present it as supporting your viewpoint. Please explain that apparent contradiction.
    2) You cannot see infrared light (IR) with an unaided eye. In fact, its discovery and name came from the observation of a type of radiation from light that had been dispersed by a prism that couldn't be seen, yet still warmed an object in its projected path The very important fact that IR can severely and permanently damage your eyes is related to the fact that you can't see it. You are not conscious of how bright it is, nor do the protective mechanisms of the eye (iris) respond to it. Nevertheless, it penetrates the tissues of the eye and can burn the retina, which results in permanent visual defects or even blindness.

    John
     
  18. GopherT

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  19. tcmtech

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    Nov 4, 2013
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    Because he thinks he is smarter and more knowledgeable than us. That's why. :oops:
     
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