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Old 03-20-2011, 03:26 PM #33
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Default Re: Gentec PS-310WB Thermopile

10 bit is plenty for my needs. W/ 2x gain I can get 2.5v max in 2.44mV steps.


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Old 03-20-2011, 03:51 PM #34
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Default Re: Gentec PS-310WB Thermopile

I'm not a programmer, but, if an external ADC is not wanted, i'm wondering if you can make some sort of "autoranging" using only software, with Arduino board ..... I mean, as far as i remember, you can change the range of the ADC converter changing its own reference voltage, and the ATMega used in the Arduino board can be used with an internal 1.1V reference, or with an external AREF pin ..... it's not difficult to imagine a very simple circuit activated from one of the outputs, that switch the AREF pin from no connection to an external reference voltage source (a TL431A, just as example), and adding some instructions must be easy enough to switch this port on when the input go over the 1V range (1024), and switch it back when the input go under a certain voltage (keeping a good hysteresis window between the 2 values for avoid continuous unwanted switching) .....

Just another crazy idea
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Old 03-20-2011, 03:51 PM #35
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Default Re: Gentec PS-310WB Thermopile

With the heatsink installed it can measure up to 10W. The minimum detectable power is 100uW. I'd go for three ranges, from 100mW to 10W full scale. If you only need 2.5W with 2.5mW resolution I love to trade sensors
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Old 03-20-2011, 04:42 PM #36
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Default Re: Gentec PS-310WB Thermopile

Quote:
Originally Posted by HIMNL9 View Post
I'm not a programmer, but, if an external ADC is not wanted, i'm wondering if you can make some sort of "autoranging" using only software, with Arduino board ..........

Just another crazy idea
Yes, it can be done and I actually tried. The only problem is the display and button shield. The buttons are set up as a single analog input, each button having it's own voltage level when pressed to save on having to use a bunch of digital inputs. Its voltage levels are based on 5V Vref, so if I change VRef I render them useless. Its not worth my time messing with their library to make the proper adjustments to make them work in both conditions.


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Originally Posted by Bluefan View Post
With the heatsink installed it can measure up to 10W. The minimum detectable power is 100uW. I'd go for three ranges, from 100mW to 10W full scale. If you only need 2.5W with 2.5mW resolution I love to trade sensors
I'm kinda fond of this beast, and in the future I might use it's extended capabilities. Just curious, what sensor head do you have?
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Old 03-20-2011, 06:09 PM #37
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Default Re: Gentec PS-310WB Thermopile

I'm still making experiments with coatings and TECs ..... I've found a decent 98-junctions 20x20mm ones, that are able to read til 0.5mW to 5W, but still need to discover a decent coating that can hold 5W (being precise, that can hold 5W in a tight beam ..... if the beam is enlarged 15mm dia, it will hold the power, but if it go 2 or 3 mm, it will get damaged).

And also, probably (but i need to check this well, before) we can get some 254-junctions very efficent TECs relatively easy too ..... still i'm not totally sure about this, need to check dismantling one () ..... I'm in the (slow) process to melt the sealing compound around the junctions (using solvents, trying to not ruin them), once i finished i will post the results.
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Old 03-20-2011, 08:05 PM #38
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Default Re: Gentec PS-310WB Thermopile

Quote:
Originally Posted by jib77 View Post
I'm kinda fond of this beast, and in the future I might use it's extended capabilities. Just curious, what sensor head do you have?
As you should be, it's a nice sensor. 100uw resolution comes in handy when measuring low power pointers. If I were you I wouldn't trade
I have an ophir 10A-V2-SH. It's a smart head which is nice, but I don't have the proper ophir readout, so just like you I have to make something myself.
I also have a few other ophir OEM thermopiles with their coatings in different states.
I also have a Laser Precision RkP-575, but I definately won't trade that one. I also don't have a readout for this one. It has a 100nW (that's nanowatts) noise equivalent power, 10W maximum, millisecond rise time, precision 1cm^2 aperture and 1% flatness over a very large spectrum. I haven't seen any thermal sensor beat that.
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Old 03-21-2011, 07:27 PM #39
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Default Re: Gentec PS-310WB Thermopile

The other one sold. Was it someone here?
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Old 04-14-2011, 05:39 AM #40
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Default Re: Gentec PS-310WB Thermopile

I was able to read the calibration EEPROM housed in the DB-15 connector thanks to an Arduino Nano ... now what it all means is TBD since I do not have a data structure to apply it to.



Code:
0x00 0x00 0x00 0x00 0xd0 0xe8 0x00 0x58 0x00 0x0c 0x00 0x00 0xe4 0xd8 0xe4 0xd4
0x00 0xc0 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0xfe 0x00 0x00 0x4a 0xe0 0x48
0x00 0xf8 0x00 0x00 0xfe 0x00 0x00 0x00 0x00 0x00 0x0a 0xf4 0x8e 0x5c 0x70 0x60
0xee 0x38 0x8a 0x60 0x4c 0x40 0xcc 0xb4 0xc0 0xc4 0x08 0x5c 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x24 0x00 0x00 0x00 0x38 0x00 0x02 0x72 0x70 0xfe 0x4a
0xe6 0x04 0xfe 0x2a 0x74 0x28 0xfe 0x0a 0x34 0x6c 0xfe 0x04 0x88 0xe0 0xfe 0x02
0xd0 0x74 0xfc 0xfe 0xea 0x04 0xfc 0xfe 0x9c 0xcc 0xfc 0xfa 0x80 0x50 0xfc 0xfa
0xb2 0x80 0xfc 0xf8 0x10 0xa0 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x30 0x38 0x00 0x86 0xae 0x14 0x00 0x1c 0x28 0xf4 0x00 0x00 0x00 0x18 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x00 0x04 0xac 0x7c 0x86 0xe0 0x8c 0xfc 0xfa 0x32 0xfc
0xfc 0xf8 0x36 0x60 0xfc 0xfc 0x20 0x30 0xfc 0xfe 0x8c 0x64 0xfc 0xfc 0x20 0x20
0xfe 0x00 0x00 0x00 0xfe 0x00 0x2e 0x3c 0xfe 0x00 0xe8 0x50 0xfe 0x04 0x00 0x02
0xfe 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
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Old 04-14-2011, 06:30 AM #41
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Default Re: Gentec PS-310WB Thermopile

I'm poking around... I have a couple ideas. I'll let you know if anything becomes any clearer than mud.

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Old 04-21-2011, 03:37 PM #42
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Default Re: Gentec PS-310WB Thermopile

Wooohooo! Look what the nice folks @ Gentec sent me.


Attached Files
File Type: pdf 69590__2005-9-26.pdf (52.4 KB, 262 views)
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Last edited by jib77; 04-21-2011 at 03:44 PM.
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