RE: IR flash and bat counts

["Alistair I. Paul" <aipaul@xxxxxxxxxxxxxx>]

> -----Original Message-----
> From: owner-infrared@xxxxx [mailto:owner-infrared@xxxxx]On Behalf Of
> Frank Schiffel
> Sent: 18 October 1999 19:11
> To: infrared@xxxxx
> Subject: IR flash and bat counts
>
>
> there's interest in counting bats at a cave entrance using IR at night.
>
> has anybody any knowledge of a VCR or other system that could be
> set up at a location and do a count? I'd suggest a 35mm or larger
> with a back and a timer that imprints on the film. that's a bit
> expensive though.
>
> a 160 VHS tape would last 8 hours and should be adequate.
>
> obviously a fixed location. fixed field of view, known distance
> to subject and all that so depth of field and all that are
> standard inputs for the technical side of the data gathering.
>
> any suggestions? comments?
>
> obviously something that would be set up and left running with no
> interaction.
>
> thanks.
Hi Frank
There is plenty of timelapse VCRs (12,24,48,72hrs and upto 960hrs on a 3hr
E180 tape) coupled with a monochrome cctv camera which are very  sensitive
(IR down to >1000nm)0.005Lux @ f1.2 (I can scan a graph of spectral
sensitivity if you like). These new cameras are as good as SIT cameras of a
few years ago.
Have a look at http://www.philipscss.com  and look for the LTC 0500 mono
camera I use this one and the colour LTC0600 and have found them to be two
of the better cameras on the market at present.
For lenses there is a great range with Fujinon and Pentax being about the
best for cctv work but you can also get them from Panasonic and Computar
with apertures as wide as f0.4 (Yes zero point four).
For IR light I use a 12V 150W varifocal illuminator from TecSec Europe Ltd.
with the options of 715nm,780nm or 850nm filters or white without the
filter.
http://www.freespace.virgin.net/tecsec.europe
With the combination of LTC0500 camera Computar f1.6 7.5mm to 120mm 16:1
zoom lens and the 150W/715nm lamp I get a useful range of about 130-140m

hope this helps
Al.
aipaul@xxxxxxxxxxxxxx

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