I'll bet you can find something, but I'll also bet that it won't be cheap.
When you think that it's got to be able to sense temps going for room temp
to 100's of degrees in a small amount of time, reading at that interval
could be a problem, and you need a sensor that won't get fried... Plus,
you're probably looking at a thermocouple to read the temp, they tend to be
slow in responding.
Now, if your looking for a way to measure something like "how long after I
apply current will the igniter fire?" , you might be able to do that with an
oscilloscope... Trigger when voltage is applied, and trigger when a "burn
thru" is detected at the igniter head (a wire with a low voltage applied
"burns thru" due to the igniter igniting) Then measure the time between the
Are you refering to the oscilloscope deal? Why an IR sensor? If you're
just looking for a pulse, a "burn-thru" will work.. The leading pulse of
the burn thru would be enough..(even without any de-bounce).
"hot enough to burnthru is hot enough to ignite motor" could be the plan..
Granted, it might take some trials to figure out what's best to use for
"burn thru", but it could be the actual bridgewire of the igniter itself!
(one trigger -apply power and wait for power drop, and measure the time
between.). If the pyrogen burns, you got the ignition time! (My IR sensor
would be what I see! The pyrogen doesn't fire, bad test!). This doesn't
need to be ISO, as it was requested to be "cheap and simple"! ("burnthru
wire will "burnthru" at 750 degrees, so it took x time to reach that point.
A piece of solder could do it, as solder often has a rated melting temp....)
Woody, et al,
I've seen some igniters vendors who claim high burn temps (e.g. 3500 F),
presumably as a metric for how well they can ignite the nearby AP. So I was
wondering how one could test home-made igniters to see how they compare,
especially trying out different "mixes". So I wasn't going for burn-through
time - yes I could easily rig up something to measure that.
As David suggests, I was hoping to find an IR sensor that could handle the
high range of possible temperatures - ideally hooked to a serial port with
logging s/w, so as to keep the h/w cost down. Have been googling, but so
far so solid (inexpensive) leads.
...The Bit Eimer NAR 84054 L1
"My goal in life is to be the kind of person my cat thinks he is"
Many moons ago, I did an IR sensor design - but I don't think I still
have the data - and I've had a really rough day so I'm not thinking
If any of the information comes back to mind, I'll post it here - but
again I warn, it's a lot more difficult than one would expect at first...
Magnesium by itself burns at a temperature around 4000 degrees F. With
the addition of
a strong oxidizer this temperature will increase to well over 5000F.
It works along the
same principle as a blacksmith using a bellows pump to blow air on
burning coal to
greatly increase the burn rate and thus increase the temperature of the
Check out the link below for more specific information about the
The challenge is something with a high enough sampling rate for the
typical burn time of an igniter, coupled with a thermistor that won't be
destroyed by the ignitor, or something that you're willing to treat as
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