A few constructive criticisms: it would help to follow along if the slide number was listed on the slide (though I know that Randy wasn't planning on calling out the slides by number) and it would've worked a little better to have the presentations in .ppt format instead of .pptx (some of them gave me a lot of trouble cause my poor old Office 2002 was having trouble translating).
Great presentation, Randy. I've got a lot of catching up to do on new sensors, but you have given me a good start. Thanks for spending so much time on this.
Good presentation and follow up to microcontrollers and preface to industrial control ...
MEMS is an exciting topic. I am glad you got to at least begin to touch on sensor technologies in this the last presentation as I find that most fascinating (and useful in terms of 'being one with the design').
Oh, one more thing, I don't think Randy put it into the notes, but to reach Kaman Precision Products on the Web (SMT9700 and tons of app notes): www.kamansensors.com
Thanks for the great presentation, Randy (I had to view this in archive..) and thanks for the mention of the Kaman 9700. I'm an engineer at Kaman and I'd be happy to answer any questions on our products or eddy-current technology. I can be reached at steve.tomporowski@kaman.com.
But what is the flow we are talking about in these sensors?
Liquids such as water, gasoline, hydraulic fluid, etc.
I specifically remeber them adressing purified, deoniozed and plain water. I'Based on being on the outside of the pipe, it should work with a variety of fluids. Yuo will hav eto explore yourself, but here is the link:
Are these pressure sensors suitable for a pressure wave detection or a sound sensor (a microphone) is a better choice?
I would think based on the specifc design and target appliucations of the sesnors I showed for wave detection, a micorpohne might be a better starting point. There are quite a few new MEMS based products.
Repeatability has to do with just the reading. Reproduceability has to do with the set-up as well. such as in 4-wire resistance measurements and getting the test leads in the same exact position each time.
I am trying to come up with a flow meter for applications that are much larger, where the environment is irregular such as irrigation ditches. They are irregular surfaces that change over time and the environmental factor is highly variable. Running the water through a pipe is not an option. A large structure that is permanent is not an option. The flows range from 0 to floods but precision is in tenths of CFS. Are there flow meters that utilize the doppler effect to measure rate and calculate over an irregular channel using ultrasound or laser or some similar technology?
I haven't explored an aplication like this myself, but I do seem to remember a company promoting a rather uniques sensng technolog, it could have used a Doppler effect, I can't provide any better thoughts at present.
I am trying to come up with a flow meter for applications that are much larger, where the environment is irregular such as irrigation ditches. They are irregular surfaces that change over time and the environmental factor is highly variable. Running the water through a pipe is not an option. A large structure that is permanent is not an option. The flows range from 0 to floods but precision is in tenths of CFS. Are there flow meters that utilize the doppler effect to measure rate and calculate over an irregular channel using ultrasound or laser or some similar technology?
Very interesting discussion, I am not exposed as much to these type of sensors will look at implementing some in future projects. Very good presentation.
For those who are interested (and if you use Windows), on slide 13, the superscript degree symbol can be had via Windows "Character Map." Select your font of choice, then select the symbol of choice, click copy and then paste into your application.
kevinJam: yes, that should "always" work. Use a sensor able to deal with the physics of the situation and package it with a dedicated MCU/DSP, voila, you got a smart sensor with linear output
What is the level of Hysterisis on the measurement in both temp and pressure sensors? Measurement during increase an decrease of measurement parameters . Does accuracy take into account of this hysterisis?
by paint, do you mean a reflective like a glossy paint, or a flat ?
Flat is better although it doesn't make a lot of difference. Color doesn't matter much either (in infrared most organic-based materials are black.) But overall, a flat, black paint is best. I've even used electical tape when I didn't have any paint.
My personal preference is to use a turbine flow meter - Less sensitive to the type of fluid being measured and can be compensated for fluid density and temperature. Just need to make sure that there are measures taken to minimize turbulence prior to the turbine.
A wrong setting of emissivity gives you a wrong value for temperature. Cheap systems assume an emissivity of 0.95. Better systems let you set the emissivity. One trick is to put a spot of paint on the surface you are measuring. Most organic materials have an emissivity close to 1.
Are these pressure sensors suitable for a pressure wave detection...
It depends on the amplitude. For example, microphones work well for detecting the pressure wave from a bullet passing over. For large explosions, you need a pressure sensor.
Temperature sensor gun-type enclosure takes into consideration potentially damaging effects of radiation being emitted from surface, even though just surface temperature is being measured?
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