The water jet is aimed at a surface about 5mm in diameter, and I need to find a sensor which could allow me to calculate the pressure acting on the surface....
I would look at the sensors, called balances, used to measure forces in wind tunnels. There are probably a lot of good ideas there you can borrow. SherpaDoug...
I think that a simple load cell (waterproofed of course:-)) could also be made into a viable solution for this problem. Regards/Roger, in Bangkok On Sun, Jul...
Hello folks. I am new here so I thought I'd introduce myself. I got notified by this group by an invitation over at edaboard. I'm from Norway, I'm finishing my...
Hi, I am planning a project where, using an ultrasonic transducer, I will emit a 500KHz-ish directional sound wave (sine) and measure the echo. I am not only...
When I did this many years ago in college, estimating the trajectory of a soccer ball by its ultrasonic echoes, I used an FM detector synchronized to the...
Hi, what sort of velocities are you planning to measure? Remeber that the Doppler frequency is given by: f_doppler = 2 * v / lambda_c = 2 * v * f_c / c where v...
Thanks for the input guys. The velocity I want to measure is that of the sea floor. Respective to the transducer, that is. I know that sound velocity is water...
Hey, Sounds like an interesting problem. I have to admit that the electronic part is way over my head, as I'm basically a bit-twiddler. I worked on a project...
Hi, I have had a little think about XOR ring modulators, I have never used one in exactly this way, but I think what happens is that the output from the XOR is...
As I recall I used a Ratio Detector, something like this http://www.tpub.com/neets/book12/51d.htm The AM output of the detector is the slope of the phase...
This is getting interresting. I cannot emphasise enough how great value your input is guys. It's a proven fact that N brains improves the figures of 1 brain by...
I'm looking for an inexpensive pulse oximeter for monitoring oxygen levels in people that has an analog voltage output. Many finger tip clip on styles are...
The comparator to logic method works great in PSpice simulations but I do have a new concern. As of now, the comparator trigger when the signal reaches a...
I'm just worried that noise could double trigger the zero crossing detection, which is why I opted to put a small offset on the comparator. But on closer...
Hi Kjetil, Thanks for the update, I am working on a home science project- I have 5 children and the youngest shows some promise in the field- I wonder... is...
I have never built one myself, but a proton magnetometer sounds like a fun, fairly simple project. Google "DIY proton magnetometer" to get lots of links to...
THanks that is very cool will do ... From: Douglas Butler <sherpadoug@...> To: sensorforum@yahoogroups.com Sent: Tuesday, August 5, 2008 6:03:44 AM ...
Hello Folks, Got back to underwater sound exploration. I've adopted a part of on of the medical RF generators that I'm working on to drive the P319 transducer...
hi there! need help in determining what type of proximity sensor should i use if i want to detect incoming glass bottles (like in carbonated soft drinks)? ......
In my humble opinion, I think your best option is a capacitive type proximity sensor. These will respond to many types of mateials, and the commercial units...
I would add: * Reflective IR sensor. It can be less sensitive to small variations in distance between the bottle and the sensor. In the other hand, if there...
You could use light, a reflective service behind sends a light beam back to the transmitter, when a bottle passes the glass and soda would probably attenuate...
Hey everynody, I think this is my first query on this group and I really hope I get the required help from you intelligent people...!!! Maybe this is not...
Hey Steve, Thanks for giving a quick response. But, you know what there are some people who say that NS2 is not suitable for sensor networks. They are good for...
Hi, I was welcomed to this group to ask a question, (thank you!) I hope I haven't looked past a previous answer here or posted in the wrong place :) Ok, I need...
Is it possible to make an ordinary MOSFET a sensor without modifying anything (the gate, the materials, & etc.)? The ordinary MOSFET I mean here is just a...
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