Info about Germanium Photosensor?

K

Kevin Criqui

Guest
I just got a few 1/2" diameter photodiodes that I think are germanium.
They are in a gold can a bit over an inch in diameter and have 6 leads,
4 of which are active. The manufacturer's logo is a square "G" and the
part number is GMP942. Does anyone have any idea who manufactured
these? Best I can tell, there is a preamp built in and these require
plus and minus 15V to operate. These were sensors in a system using a
YAG laser.

Kevin
 
Kevin Criqui <usenet@kce.com> writes:

I just got a few 1/2" diameter photodiodes that I think are
germanium. They are in a gold can a bit over an inch in diameter and
have 6 leads, 4 of which are active. The manufacturer's logo is a
square "G" and the part number is GMP942. Does anyone have any idea
who manufactured these? Best I can tell, there is a preamp built in
and these require plus and minus 15V to operate. These were sensors
in a system using a YAG laser.
Click to expand...
There was supposedly a Germanium Corporation so that alone doesn't
necessarily imply they are germanium.

Why would you need a germanium detector in a YAG laser unless it was
running at 1319 nm or one of the other IR lines beyond 1100 nm.

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On Sat, 05 Mar 2005 15:25:20 -0800, Kevin Criqui <usenet@kce.com>
wrote:

I just got a few 1/2" diameter photodiodes that I think are germanium.
They are in a gold can a bit over an inch in diameter and have 6 leads,
4 of which are active. The manufacturer's logo is a square "G" and the
part number is GMP942. Does anyone have any idea who manufactured
these? Best I can tell, there is a preamp built in and these require
plus and minus 15V to operate. These were sensors in a system using a
YAG laser.

Kevin
Click to expand...
They're from Germanium Power Devices
http://www.gpd-ir.com/index.htm
There is a chance that they are quads, not amplified "hybrids".

Steve J. Noll | Ventura California (USDA Zone 10)
| The Glass Block Koi Pond/Fountain:
| http://www.kissingfrogs.tv
 
Steve J. Noll wrote:
On Sat, 05 Mar 2005 15:25:20 -0800, Kevin Criqui <usenet@kce.com
wrote:


I just got a few 1/2" diameter photodiodes that I think are germanium.
They are in a gold can a bit over an inch in diameter and have 6 leads,
4 of which are active. The manufacturer's logo is a square "G" and the
part number is GMP942. Does anyone have any idea who manufactured
these? Best I can tell, there is a preamp built in and these require
plus and minus 15V to operate. These were sensors in a system using a
YAG laser.

Kevin


They're from Germanium Power Devices
http://www.gpd-ir.com/index.htm
There is a chance that they are quads, not amplified "hybrids".
Click to expand...
Thanks for the pointer. I don't see this particular model on their
produce list so I've emailed asking for more information. I've seen
quads in the same package, but this is definitely a single sensor and I
can see a fairly large IC next to it which is why I guessed that it has
a built-in preamp. I'll post again if I get specs.

Kevin
 
Kevin Criqui wrote:
Steve J. Noll wrote:

On Sat, 05 Mar 2005 15:25:20 -0800, Kevin Criqui <usenet@kce.com
wrote:


I just got a few 1/2" diameter photodiodes that I think are
germanium. They are in a gold can a bit over an inch in diameter and
have 6 leads, 4 of which are active. The manufacturer's logo is a
square "G" and the part number is GMP942. Does anyone have any idea
who manufactured these? Best I can tell, there is a preamp built in
and these require plus and minus 15V to operate. These were sensors
in a system using a YAG laser.

Kevin


They're from Germanium Power Devices
http://www.gpd-ir.com/index.htm
There is a chance that they are quads, not amplified "hybrids".


Thanks for the pointer. I don't see this particular model on their
produce list so I've emailed asking for more information. I've seen
quads in the same package, but this is definitely a single sensor and I
can see a fairly large IC next to it which is why I guessed that it has
a built-in preamp. I'll post again if I get specs.
Click to expand...
I got a reply from GPD Optoelectronics today. The GMP942 is in fact a
germanium photodiode with an active area of 13mm and has a built-in
AD645 amplifier with a 1K feedback resistor. The ones I got are mounted
behind what appears to be a long pass filter (looks deep red when
looking through it) which makes the module fairly unresponsive to
visible light.

Kevin
 
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