Requirements for data aqusition for body tempatures

[sayluv]

Hi.

Let me preface this post with the fact that I know nothing about hardware.

I am trying to compile something  that will be used to accurately collect body temp at various points over a persons body over

several hours. The device needs to be relibable, but I am also looking for something that I myself will be able to figure out. 

A similar study used the following.

16 thermistors (type MA100GG; Thermometrics, Edison, NJ) connected through a linear voltage divider (10 k. ± 5% precision resistors)

BNC-2090 A/D board

Labview.

To reduce the incidence of wire failure, thethermistors were connected to the data acquisition system with 28-gauge wires.

The 16 voltage dividers were arranged in parallel, and the circuit was powered at 0.5 V (voltage supply model PS280; Tektronix, Inc., Beaverton, OR) to minimize
thermistor self-heating (< 0.01°C). Data from all 16 channels were simultaneously collected at 1 Hz, and the manufacturersupplied
curve fit was used to calculate temperature from the measured output voltage.

Please let me know if I can move this to a more appropriate board.

Thanks, J

[KateB · Accepted solution]

Hi J,

I set you a set of hardware for 16 channels of thermistor.

The following set of hardware is recommended for this requirement at lowest cost:

1.PCI-6221 and SHC68-68-EPM cable, http://sine.ni.com/nips/cds/view/p/lang/en/nid/14132

2.SCXI-1349 adapter between PCI-6221 and SCXI, http://sine.ni.com/nips/cds/view/p/lang/en/nid/1627

3. SCXI-1503 and 1306 for 16 channels thermistor, http://sine.ni.com/nips/cds/view/p/lang/en/nid/204198

You can use LabVIEW SingalExpress that comes together with the hardware to log the data, or if you wish to do further analysis, LabVIEW can also help you.

You don't need to calculate temperature from acquired resistance.

Software will output you a temperature directly, but you need to input a correct parameter from thermistor specification.

Regards, Kate

[KateB]

Hi J,

Sorry you also need SCXI-1000, http://sine.ni.com/nips/cds/view/p/lang/en/nid/10676.

Regards, Kate

[sayluv]

Good Morning Kate.

Thank you very much for your suggestion, very much appreciated.

Can you tell me the pros/cons of the design I posted versus your suggestion?

I compiled all the items into a cart. http://sine.ni.com/apps/utf8/nios.store?loc=en-US&action=view_cart&elq=9D4D3E036D504B9A82C6999C88F9A... 

Thanks, J

[KateB]

Hi J,

The design you posted doesn't expose a DAQ card.

Therefore, I cannot fully evaluate this, but what I can claim is that:

1. You can connect sensor directly without external excitation or precision resistor, since they're built in.

2. You don't have to manually calculate temperature in software, since it can configure to measure temperature directly.

Cons:

1. If your thermistor already have a BNC connection, you may need to change it, since terminal block in my suggestion supports bare wire.

2. If you already have a control chassis, you may need to re-design it, since dimension is different.

Regards, Kate

[sayluv]

Awesomeness. Thanks for your time!