wavelength for pulse oximeter

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rina_1220

Joined: 02 Jun 2006
Posts: 65
Helped: 9
Location: Brazil

26 May 2007 3:01 pulse oximetry wavelengths

Hey all. I need to build a pulse oximeter for my final project in college but i still have one doubt about the wavelengths
do these waves need necessarily to be 660nm for the red led and 910nm for the IR led?
I have a 875nm wavelength IR led here. Will it be ok?
Thanks for the help

Aw. And what about the photodiode? Or should I use a phototransistor instead? What is better?
thanks again

klystron

Joined: 11 Jul 2002
Posts: 146
Helped: 4

28 May 2007 9:34 oximeter wavelength

The commercial sensors are disposable; ask a supplier to donate a sensor to you for your studies

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28 May 2007 9:34 Ads

rina_1220

Joined: 02 Jun 2006
Posts: 65
Helped: 9
Location: Brazil

29 May 2007 16:06 notes on pulse oximeter

I would like to make the sensor too... It's just a matter of experiment at first. Could someone who has already worked with it help me please?
As I've seen the circuit for the sensor seems to be simple. My problem is just with the leds light wavelength.

klystron

Joined: 11 Jul 2002
Posts: 146
Helped: 4

31 May 2007 11:02 Re: wavelength for pulse oximeter

Here is some details on commercial sensors

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rina_1220

Joined: 02 Jun 2006
Posts: 65
Helped: 9
Location: Brazil

31 May 2007 19:35 Re: wavelength for pulse oximeter

hey thank you.
I've got some phototransistors, some 660nm red leds and some 940nm IR leds here. I'm trying to make my sensor work tomorrow.
Hope it works =)

rina_1220

Joined: 02 Jun 2006
Posts: 65
Helped: 9
Location: Brazil

18 Feb 2008 16:28 Re: wavelength for pulse oximeter

I got it to work. It is pretty simple, but I got good results with photodiodes. I didn't get phototransistors to work properly for this.

http://www.bioe.psu.edu/SeniorDesignProjects/SD2006/DFord/bioe450%20web%20page.htm
In this site there are some worth notes about pulse oximetry.

Katak

Joined: 26 Aug 2009
Posts: 7

04 Sep 2009 15:23 Re: wavelength for pulse oximeter

hye... lm a student. would you mind sharing with me what component u used to make the sensor? specific detail and type code if u dont mind.. lm not very good in choosing emitter and photodiode >.<

rina_1220

Joined: 02 Jun 2006
Posts: 65
Helped: 9
Location: Brazil

04 Sep 2009 15:26 Re: wavelength for pulse oximeter

look here
http://www.bioe.psu.edu/seniordesign/SD2006/DFord/bioe450%20web%20page.htm

it's the same work i posted above, but that link is broken.

Katak

Joined: 26 Aug 2009
Posts: 7

04 Sep 2009 15:47 Re: wavelength for pulse oximeter

thanx for the link... Very Happy

can l want to use HOA1397-002 Reflective Sensors?

http://sensing.honeywell.com/index.cfm?ci_id=140301&la_id=1&pr_id=152790

this one has infrared emiter and also receiver.. but no red led.. do u have any suggestion? l had made heart beat monitor using this sensor.. so if possible l want to use the same sensor with a bit addition. if possible la...

Added after 1 minutes:

er.. sorry for the bad english... l hope u can understand what lm trying to say... (-_-")