... I used to use those sensors for measuring wave impacts when I worked at WHOI about ten years ago. Our sensors were built by two companies, Marsh-McBirney...
Colleagues, In the near future I might be tasked to build a small electronic strap-down compass. The unit will observe only about 30 degrees of out-of-plane...
I have an existing controller that expects to see sensor values in the range of 0 - 5V. Unfortunately, the attached sensor is faulty, and a replacement is...
Hello Vic, Thanks for the advice! I was almost certain that you would post about the magnetic sensors, because you¡¯ve used them in the WindReader. I was...
Hi Vic, Thanks for the tip! HMC1052 comes in a leaded QSOP that I can solder by hand. I'll probably use that instead of a breakout board. Speaking of...
Nick, Here is a complete solution to yur quest: http://www.sparkfun.com/commerce/product_info.php?products_id=754 I'm taking a close look at this one. Vic ...
I am using pvdf polymer to measure forces in the frequecy range DC- 1KHz. I need an electronic interface circuit to get the electrical output. I came to know...
PVDF films behave similarly to quartz piezos. Because the film's (or the crystal's) electrical impedance (at low frequencies and DC) is very high, a buffer...
Also be advised that pvdf like pzt and other piezoelectric mtls. is capable of generating rather high voltages if deformed rapidly. A high voltage clamp is...
Doug and Tom..Thanks for the information on interface circuits for pvdf. Ravinder ... http://www.analog.com/UploadedFiles/Associated_Docs/404380967COMPLETE ...
... Don, The standard industrial controls solution to your problem is to direct your 4-20 signal through a precision 250 ohm resistor. This gives you a 1 to 5...
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If you add one resistor you can convert the 4-20 mA range into 0-5 V without loss of resolution. I posted a simple circuit I used in a laser interface...
One of the features of 4-20 mA is "live zero". It allows the host controller to be able to tell the difference between a device that outputs zero (4mA) and...
This is correct and for wired sensors an important issue. In cases where this issue is less important you can get more resolution by this enhancement. Claus ...
Hi, I'm surprised nobody has mentioned this, but maybe its because its an overly complicated solution (but maybe it has some power saving advantages?). A Hall...
That's an ineteresting approach. It can be useful, when the external sensor need sto be galvanically isolated. Although, I've never seen a Hall effect sensor...
There are dozens of web sites that contain the history of the RTD which seems to all be stolen from the same source (From Omega Engineering?). The article...
ITS-68 has been obsolete for some time. It is still used by some long term environmental studies that don't want to change temperature scales in mid stream,...
Thanks! The search for ITS-90 led to a ton of hits related to thermocouples. I was able to narrow it down to RTD's with a sub search for IEC751. I finally...
... light lines? If "dark" and "light" is under IR illumination that the sensor can see, yes. If "dark" and "light" is what_you_ see under white light,...
As Tom says light and dark have to be viewed from the point of view of the IR sensor. Also the sensor needs IR light to see by. That means you need tungsten...
how fast will a ir sensor be able to sense the ir ray.... my application is to count the spokes in a two weeler tyre ... in turn with it calculate the speed of...
A cheap IR sensor can detect an IR ray from a cheap IR emitter over a distance of meters. TV remote control would be a good example of that. Shining through...
fnds, my ir +photodiode sensors work well in dark but behave abnormally when any traces of sunlight is present .... please tell me how to use a high pass...
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