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64 Threads found on edaboard.com: E Field Detector
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 .
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
hussain_kiet, perhaps this can help you: bye !!!
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. (...)
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
Dear friends: I want to design a portable system for sense charged power lines and systems for human protection near power ssystems. For this, I need a sensor for measure low level electric fields (which is about 20-30 V/M). Can you give me an advice about some semiconductor device for do it ?. Could you give some basics of principles for appro
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
Do you need CA to measure capacitor or charge? Charge amplifers are used in micromechanical sensors. But charge is changed there because capacitor changes. And if the speed of capacitor deviation is low, it is better to use capacitor to voltage convertors.
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.
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 (...)
I and my group planned to have a project about noise level detector using DSP for our project design...and we are wondering if what are the things we should gather to produce the hardware...i mean the materials needed..does it cost much?? somebody please help us...we need your advice...what particular devices that can detect noise level?and where c
Hi all, Im suppossed to build an electromagnetic field detector, I was thinking about using a coil as a probe to detect low freq changes in magnetic and electric fields (as to detect hidden wiring for example) (its not supposed to use any special purpose IC's) I know absolutelly nothing about osc. theory, so I got this schematic but it (...)
- go to - enter MA4E2037 in field Part Number Search - mark Contains - click Find Part - click View All Documents - click View
Hi buts101, I see a problem if you trigger a water line to put out fire caused by spark or electric malfunction would create a havoc as water is conductor of electricity (unless it is very pure) and this would cause trouble. Try using a system that trigger a DCP (Dry Chemical power) or a Form type extinguishing system. Now coming to the case
Hi all :) , I have a very stupid question to ask. If I wanted to measure the magnetic field around a loop antenna how would i go about doing it and what equipment would I need. I'm not clear on the methodology :( Any advice is much appreciated Kind Regards Cat :)
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 (...)
What Verba is trying to tell you is that the "Gold detectors" that you see advertised for sale are just ordinary metal detectors with sensitiviy enhancements. They use different frequencies, sense coil sizes, and pulsed signal techniques to allow detection of small metallic objects against a background of metallic oxide sand, or other naturally in
How can I make a precision Peak detector?
Hello, There are two men..... One is sitting on a moving wagon and is holding a Coulomb of charge in his lap. The other is stood by the roadside, watching the wagon go past him. Both men have Magnetic field detectors with them. The man on the wagon detects no magnetic field with his detector.......sounds about (...)
So, you shut down everything. Mobile phones, broadcast stations, power lines, CATV, (you forgot the satellites), instead making a simple and immune RF
if I got two RF signal sources, one, which transmit at 2GHz 20mW/m2 at 1 meter distance and the other which transmit at 3GHz 10mW/m2 at a 1 meter distance. Should the RF field strength power meter show 30 mW/m2 at 1 meter distance from them? or just the 20mW/m2 (from the strongest signal source)?
Please look into a textbook. The near-field zone of an antenna is defined from the ratio of its aperture size to wavelength. Large antennas (with apertures many times larger than the wavelength) in fact shape their main lobe of radiation pattern quite far on axis. Satellite communication antennas (like Intelsat) form their main beam up to hundred
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
You probably left the gate floating. As mentioned by Brad, you need to pull the gate low. When designing circuits with MOSFETs, you should ALWAYS use a pull-down resistor from gate-to-source. Value could be between 1k to 4.7k. You'll find plenty of threads of MOSFET failure, where the solution was the pull-down resistor.
what is the freq.
Over what range do you need to detect obstruction? and what field of view angle? I am thinking of a simpler pulsed IR Rx and Tx. Any voltage available? for detector? What user interface is necessary? desirable?
7-14 ?m is far IR rather than visible light, fully absorbed e.g. by glass windows, but passed by polyethylene films. Any pulsed heater can be used as a far IR source.
I am looking for a hardware clockrecovery circuit that is able to derive the clock from a 300 kbps datastream. The datastream is the output of a FM detector. Anyone with expierence in this field?
It get challenged if you are doing the didoe rectification in RFID . Convert the power from couple magnetic field and pump to the workable voltage for IC .
sum info about Metal Locators. Basic Types and Design Factors
I did see something a long time ago using Hall Effect sensors.
Interface circuits such as USB PHY, IEEE-1394, DVI, and LVDS are good examples of mixed-mode signal ICs. If SOC is the future, mixed-mode signal will be the key.
Looking to the formula from above link seems that you need a lot of pressure to get some speed indication. What about when the boat will have 10 km/hour? I think Pitot tube on a boat is a joke.
you might be able to use some ideas from here
I guess beabroad is referring to burst-mode CDR in optical communication systems, which is recently inspired by the high demand of GPON transceivers in Asia (Japan and China). Up to date, I don't get a good design reference in this type CDR. Actually you will find the reference for burst-mode driver/TIA is also very limited. Real markets are pre
In this circuit everything will depend on the first transistor, Q1, and on quality of 470pF capacitor. Try polystyrene type capacitor as they have very high insulation resistance.. As Q1 you need to select one with very, ver high β, Iwould say close to 1000. Try high quality low noice audio transistors such as BC559C and select one with the h
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 (...)
You can store a current in an inductor (magnetic field), or a voltage in a capacitor (electric field). A charge-coupled device (CCD) stores an array of analog voltages in an array of capacitors. DRAM and some ROMs use capacitors too, and some of them recognize mutiple voltage levels as distinct bits. A magnetic tape recorder ... well, you get the i
Have a look at this publication: "DEVELOPMENT OF AN AUTONOMOUS ADAPTIVE TRAFFIC CONTROL SYSTEM" It will be a very good starting point .. Regards, IanP TRAFFIC detectorS An essential feature of any dynamic traffic control system is its capability to compute traffic flow rates at t
Could any one know how to obtain the modal properties of photonic crystal fiber like effective index, dispersion, .... from the FDTD method. I know that we must take first FFT then what?
which IRLED+photo diode combination should I use for edge detection I got 5-7cm clearance b/w the robot body & ground plzzzz tell me the part no. that is easily available in market & inexpensive
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
A red, infrared or any color led will easily reach 1 metre away. Proper lensing is the answer if narrow beam is wanted, or for narrow field of view detection. Pulsed modulation is the answer if other ambient light rejection is wanted. Don't say you can not see a led lit at 20 metres away... Where do the 'sophisticated' opinion and 'an infr
Good evening, I'd like to design a circuit to measure the terrestrial TV signal level (measured in db?V) on a display. As you well know, this is a function available on a TV field Strength Meter. This circuit must allow you to select the TV channel (frequency) so you can then measure the signal level at that frequency Have you some idea o
Now depends in what kind of near-field you are. For example in Reactive Near field the Electric-E and Magnetic-H fields are not orthogonal, and polarization is not a meaningful parameter. Myself, I would go in the far field to measure the polarization of the antenna.
hi... i need to design for rf part ( transmitter and receiver).where can i find source of infornmation on fmcw radar design this is my parameter To design and construct a polarimetric FMCW Imaging System. The proposed system should have the capability to measure the complex scattering matrices of distributed targets using FMCW system and produ
i wanted mobile phone sensor plz help me
Friends, I want to make CHECKPOINT FREQUENCY SECURITY TAGS detector. Suppose Tags works @8.2MHz, and are taken from EAS (Electronic Article Surveillance system) from store. Any ideas, schematics... firmware for mcu is not problem, but hardware? Thanks in advance, Peja
I think, it is working for magnetic field.