Some discontinued medical machinery from Invivo, a pcb with some sensors on it "ANESTHETIC AGENT ANALYZER MODULE II"
It has this custom assembly of an IR lamp with a reflector, a flow cell and a phododiode array (presumably)
12 pin part. scratched markings that read "3-8-1B-15"
Would like to find out about this sensor and if it could be used in some diy spectrography spectrometry project.
On the photos, the full pcb.
Disassembled module, ir lamp is a ceramic rod with a conical reflector, the flow cell in center and the presumed photodiode array on the right with a split window, spacers and module plate.
It is a sensor that could be used with arduino in a spectroscopy / spectrography project?
I am trying to get information on what its sensitivity.
The opamps that are used on the pcb are ltc1053cn, 3 in total.
The OPAMPs are ~ 15 bucks each - and ther is an atmel Chip (probably a uC) with a sticker. If you feel like reverse engineering is a funny project just do it
It's a board that was designed at least 21 years ago. Ask yourself if you want to spend time figuring out the pins on a component of that vintage whereas you can probably find better quality sensors today at lower cost.
If it was a photomultiplier tube or something expensive like that it might be worthwhile. But a photodiode array? I'd just buy a new one that fit my needs.
You are right, the board is ancient, circa 2000s.
In order to satisfy our curiosity I used non destructive remote viewing technique called grinding wheel.
Ive opened the cap on the detector to see inside.
Its a sandwich of some layers and see for yourself.
Just to comment a bit on the pictures.
The image just above , with 3 pieces, the top left part with 4 blue blobs, I have removed that ceramic grating screen so we can see the circuits below.
The round object on the right with square windows, they do look like they have different color.
The image of the full assembly uncapped, top part with the small blue resin dot,
notice a small hair of a wire that goes from the leg to the recess with a square piece of silicon. This part is not illuminated directly and sits under the metal part of the window.
So gentelmen, any guesses on what the sensor is?
Looks like one common leg in a cirlce and an output leg on each of the 10 detector squares.
If you hadn't posted the entire board, along with manufacturer information, it would have been a great candidate for Bunnie Huang's "Name that Ware" monthly contest
It's amazing how good those guys are at figuring out what some obscure hardware is.
The woven glass fiber insulation usually is seen on something that gets extremely hot. Likely the IR source is a piece of very hot ceramic material heated from nichrome wires inside the device. Two different resistances indicate two different heats.
I think you need to discover exactly what anesthetic agents were being tested before you can discover what the device did. Were they gas or liquid? Were they under pressure?
I believe its a breath able pressured gas, check the flow cell.
IR spectrum detector.
Any ideas on the actual detector and the used op amps?
Si or In Ga ?
I guess the "IR lamp" comes with a termocouple or thermistor.
What about them small sqare "filters"?
And the small detector that is under the metal cap not in the windows view.
Btw I have another one just like it on a pcb that looked in better shape.
The equipment received some blows before being tossed into recycling.
Actually, I would start with Google and then move to AI. Ask a question about what gas will emit a visible light photon when excited by very long wave length IR photons.
It's not about emission. It's about absorbance. It's a pyroelectric IR detector. It's basically an IR gas detector for multiple gasses. It's not a diode array, those would be all in one line. This measures the absorbance of the IR light by different gas molecules at different wavelengths. You can use Beer's law to determine the concentration from the absorbance.
I'm more interested in the lamp. Does it have an opening in the gold colored piece? I wonder what that's made of. I assume that the white part is a heating element. I wonder if the metal dome is chosen to glow at a particular range of IR wavelengths.
