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RE: solar sensors

dougw — Wed, 24 Dec 2014 05:56:30 GMT

There are lots of low cost light sensors on the market. Photoresistors cost about 5 cents each.

You will have to calibrate them yourself if you need some specific spectral sensitivity.

What type of interface do you need?

What accuracy do you need?

What spectral sensitivity do you need?

What levels of light do you need to measure?

What speed do you need?

RE: solar sensors

Former Member — Tue, 23 Dec 2014 16:52:51 GMT

its too costly for my project.

solar sensors

Former Member — Tue, 23 Dec 2014 08:39:04 GMT

can anybody suggest me an alternative for Honeywell SAF25 which is used for measuring the solar irradiance?

RE: solar sensors

gadget.iom — Tue, 23 Dec 2014 15:23:38 GMT

What's wrong with the Honeywell SAF25?

RE: Questions about lighting from Optek? Ask me, Walter!

Former Member — Tue, 23 Aug 2011 14:29:02 GMT

Walter,

This is a test. Let me know if you don't get it.

Questions about lighting from Optek? Ask me, Walter!

Former Member — Thu, 29 Jul 2010 21:40:51 GMT

If you need help on anything technical relating to Optek lighting, please post your question here!

Don't forget to sign up for email notifications under the "Actions" box so you'll see when I answer your question.

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Walter Garcia Brooks

Walter Garcia Brooks is a Marketing Development Engineer Manager for TT electronics OPTEK Technology. Walter has been in the optoelectronics industry since 2004 and has held the following positions: Test Engineer, Product Engineer, and Field Applications. He received his BSEE from the University of Texas at Dallas and is currently working on his MSEE at the University of Texas at Dallas.

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Liquid Sensing

SensorIR — Mon, 12 Jul 2010 21:06:41 GMT

Hello TT Electronics,

I recently saw an article about your OPB350 liquid sensor. Can this sensor detect the presence of opaque liquids? What about bubbles in a clear liquid? Can you give me an overview of how this product works.

Thank you,

Jon

RE: Liquid Sensing

Former Member — Wed, 14 Jul 2010 00:07:32 GMT

Hello Jon, thank you for your question.

Identification of different fluids can be accomplished by monitoring the output current of the phototransistor. For example, if the initial state is clear fluid, the output would be highest. If the material on the fluid is black, the output would be lowest. The output is analog; hence it is possible to detect states in between clear and black.

The light emitted from the LED has a typical peak wavelength around 890nm. As long as the material is able to attenuate 890nm, then the output will change. For example, you may be able to detect Hematocrit percentage on blood because red blood cells tend to diffuse more near infrared light.The sensor also is able to detect bubbles as an absence of material however; the bubble(s) needs to be the same size as the inner diameter of the tube in order for the sensor output to be consistent.

Please let me know if I can be of further assistance.

Walter Garcia Brooks

RE: Liquid Sensing

WarrenW — Mon, 12 Jul 2010 23:32:00 GMT

Hi Jon,

The datasheet at http://datasheet.octopart.com/OPB350-TT-datasheet-132831.pdf pretty much answers your questions.

Cheers