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25 Threads found on edaboard.com: E Field Detector
Wireless E or H field depends on gap loss and coupling for current, frequency and Loaded Q of detector among other things. it is best to use a good receiver and monitor RSSI signal.
You either need to connect a load, or go for electrical field (voltage) sensing. It's not as selective as current sensing.
Hi, I work as an electrical engineer in a new start-up company which is developing a metal detector. In the meantime the company is of 3 people and we have succeeded in building up a prototype of the product. I have received my degree not long ago and this is my first job in the field of electronics engineering. The next stage in my job wil
As you are detecting high voltage, you'll want to measure electrical not magnetical field, I presume. I also guess that the measurement can be restricted to low frequent AC fields? As a starting point, you calculate field strength numbers for intended sensitivity.
what do you want to detect (1 mV, 100 mV, 2 V, etc)? Whether you will measure something depends on what you use as antenna and the strength of the field. BAT85 is not the best Schottky diode for a simple UHF detector. Try to find a schottky diode with less capacitance. A very nice detector diode is BAT62 as it has a good breakdown (...)
Below please find the link for building a microwave oven electric field detector using the RFD102A (RF-DC Converter) module from RF Diagnostics, LLC along with a surface mount LED and a dipole antenna made from the wires of a 1/4 leaded resistor. It's a fun gizmo to show the electric field strength on the outside of a microwave window. The (...)
A motion detector operates on ultrasonic waves. Just like sonar or radar. However it does not detect direction. It only detects that something is moving in its field of view. So you might get results if you were to mount a motion detector on the robot, and sweep it right-left-right-left continually. If it picks up someone moving, you'll (...)
20uV would not really open a simple Schottky diode detector. You need an RF amplifier in front of your diode detector, and probably a simple DC amplifier after the diode. After that, the circuit might need a calibration for showing the right level of voltage/power at the input.
If the RF Power detector circuit is used only for conducted measurements, and if the circuit is designed properly in terms of the PCB design and using shield cans to give isolation to external electromagnetic field, everything would work fine and able to measure the power of low signal levels. There are more RF Power detectors options from (...)
Hello newbie here :D I would like to ask for help in our project... we're planning on using lux meters as an obstruction detector... the idea is that we will use the changes in value of illuminance in an controlled area... that thing is that we need to connect the lux meter into a computer.... an make a program that will track that change...
Make cheap nice and easy SMS alarm with phone, making GSM module is hard job and its not for beginners, better buy finished assembled and tested gsm module in market shop. On one of sensors input at SMS alarm sensor link 60km/h speed detector and thats it.
Your solution doesn't seems to be practical. Why not install a metal detector on the ground? The typical sensor use to detect vehicle is call a loop sensor. It used magnetic field to detect the vehicle. When vehicle tend to beat red light...then tend to move fast at a speed of about 60kph or more....that is the re
dear all greetings, i am trying to build a metal detector sensor based on LC circuit (at resonance). which leads to any metal come in the range of the magnetic field of the coil will leads to drop in the voltage so that i can sens it with amicro controller. now here is the problem the resonance frequency is 130khz (using a generator) now
Hi ALL I need to article "Magnetic field detector by Andy Flind " published EPE magazine January 1995 . dose anybody having it? If yes , please upload here or send to my email box: aft.72005@gmail.com Thanks in advance .
hi, all, i need the following papers. pls upload if you have. 1. Kordic, S., Integrated silicon magnetic-field sensors. Sensors and Actuators. v10. 347-378. 2. High sensitivity silicon magnetic field detector Doyle, J. Custom Integrated Circuits, 2001, IEEE Conference on. Volume , Issue , 2001 Page(s):105 - 108 3. (...)
hussain_kiet, perhaps this can help you: bye !!!
I think will be very difficult to complain with this because the amplitude of the RF signal is very variable depending on the RF field surronding the antenna, instead you have not a so wide dynamic range on the laser modulation. Even trying with a log detector it will not modify the situation because the frequency and phase informations will be lo
Hi, not the expert in this field but I would say that the only difference might be in the time constant used in video portion of detector circuit. For peak detector the constant should be very small so that instantaneous value of the signal is detected, for RMS detector it should be long so that integrator like (...)
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My PIR sensor circuit is sensitive to RF field variation. Please check attachement for the circuit. At the moment when RF field got applied or removed or variated. TP13 output a trigger signal which is strong enough to trigger a detector. Seems its the voltage variation when subject to RFI leads to the false trigger. How to get rid of (...)
There are several circuits, but the basic principle is the same for all of them. You use a "search coil" that you move over the area where the metal might be found. As the moving coil passes over the metal object, the presence of the metal in the coil's field causes a change in the field. Some detectors use a tuned circuit. When a (...)
You should use the following sequence: wire antenna, broad band RF amplifier, diode detector, indicating method. A simpler method which is not as sensitive is the wire, diode, oscilloscope.
Hi I was involved some years ago in the field of machine vision .. There ares several aproaches that you can do ..I Advise you first to start to UNDESRTAND SEGMENTATION .and edge detection .. INTEL has very nice LIBS .. look for them .. Now .. Once you UNDERSTAND how a MACHINE can SEE .. then you have to build a SYSTEM to compare "FEATURES" t
I'm looking for a design of low level electric field detector too. I'm interested in the principle of operation of this probe: Can anybody help us? nebisman
the best solution is to make use of a ccd and watch the iron content in the bload a ccd when you emit a magnetic field and tune the frame refresh to the mag field freq you will see the iron or the polerised particules etc etc as harmonics of the mix freq so... you can split the ccd into different colours blocks