Re: Pyroelectric Detector!
- From: John Fields <jfields@xxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 02 Sep 2005 13:18:09 -0500
On 2 Sep 2005 02:30:34 -0700, "Natty"
<Raghunathan.Appavou@xxxxxxxxx> wrote:
>hello friends,
>
>I need ur help. I am using a PIR detector (IRA-E700STO SERIES MURATA)
>
>I dont get any changes in the output voltage when an infrared body
>
>is detected.. the output voltage ust produce a transition from either
>
>+ve to -ve or from -ve to +ve.. I dont get that.
---
The detector is doing just what it's supposed to do, which is to
sense a _change_ in temperature and produce an output when it senses
that change. What's happening is that when the sensor heats up it
sends out a voltage of one polarity while it's heating up, and then
when it starts cooling down it sends out a voltage of the opposite
polarity while it's cooling down. During the times its temperature
is steady, it does nothing.
---
>A PIR detector has an inbuilt FET. the pinout of the detector is the
>
>Drain, Source and the Ground.
>
>The detector is powered by supply connected to the drain.. and the
>
>out put from the source is used for further analysis. I am a bit
>
>confused.. I am not sure if something is wrong with the detector. I
>
>wud really appreciate ur suggestions. thanx in advance.
---
If you're getting _any_ output from the detector, chances are
there's nothing wrong with it.
--
John Fields
Professional Circuit Designer
.
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