Detector Definition and 263 Threads

Simple explanation for non-physicist, please!

Homework Statement Please see the attached photo. (The one with the green highlighter), I haven't written it out to avoid mistakes. Homework Equations None. The Attempt at a Solution I have constructed a moore state diagram, a state transition table and come up with boolean...

Hello, I have cool idea for a device and one hardest part of it is to detect the movement of the object. I think I can use a wire coil, and a small magnet attached to the moving object. When the object passes the wire coil (up or down), there will be small voltage inside the wire coil. It...

Suppose you're shooting electrons one at a time through a double-slit experiment. If we don't detect which slit an electron enters, you get a fringe pattern on the screen beyond the slits. If you detect which slit the electrons go through, then the fringe pattern is lost. However, wouldn't...

A few weeks ago I stumbled upon an MIT Technology Review article about a DNA-based dark matter detector. As a biologist I thought the idea was strange, since I didn't see how DNA would interact with dark matter in a way that a more easily manufacturable material such as silicon wouldn't. I put...

dear all is there anybody familiar with the definition of the acceptance of detector, especially used in high energy physics? please explain it for me. Thanks in advance!

I am fairly new to circuits, (I am an applied physics major, I have one year left until I get my bachelors) and I thought it would be really cool to make something that shines a light or something if someone crosses past a sensor. For example, if I wanted to know if someone walks into my shed...

I'm new to the forum, and will much appreciate your advice. Looking to build a cheap water detector, that will not change the chemistry of the water. It should simply indicate if water is touching it (if water reach a certain level in a tank made of plastic). Many thanks Al

I'm reading up on semiconductors and there seems to be a few fundamentals I cannot find answers for if anyone can help? I understand that n-type substrate is doped with a donor and p-type substrate is doped with an acceptor creating excess electrons and holes. When you put the p-type and...

Can someone supply me with a link to a good article or book, or anything, that gives details on the type of detector that determines "which way" in experiments where the double-slit interference pattern is cancelled? DC

questions about the Soviet's Venus missions I was reading about the Soviet Union's Venus missions and they equipped Venera 9 orbiter with cherenkov detector. So it detects particles traveling faster than the speed of light in a given medium What was this Cherenkov detector used for? It...

Hi. I'm trying to build a quadrature sampling detector, or Tayloe detector based on the design at http://garage-shoppe.com/wordpress/?p=371 . I intend to feed the I and Q signals into a ADC that uses a 1.65V reference. One thing I'm confused about is the purpose of the 2.5 VDC offset fed into...

Dear everybody, this is my first post :biggrin:, I need help here can anyone tell me what exactly is the unruh-dewitt detector? I really interest on this effect (unruh), so lately I read many paper about it, but I really struck in what exactly Unruh dewitt detector. Thx for helping me.

Hey guys, I'm new to this forum, and I want to start off by asking about some help to understand the composition of this circuit. The circuit is made by Kip Kedersha, and is found http://www.howcast.com/videos/1499-How-To-Make-a-Homemade-Lie-Detector. This is the circuit: I'd like to...

Hi guys, I have some questions about this detector. So i have a project about this detector, i made some experiments, made some graphs, answering to some questions, but one questions is struggling me. How can we avoid to calculate the solid angle, i mean in what situations? In my lab documents...

Homework Statement A detector initially moves at a constant velocity directly toward a stationary sound source and then (after passing it) directly from it. The emitted frequency is f. During the approach the detected frequency is f'app and during the recession it is f'rec. If the...

Edgardo thanks for posting the links to Bell's Theorem. I read the first one and it was a clear description of Bell's experiment. I have a question (or an alternative explanation for the difference in probabilities between mathematical calculations and experimental results in the Bell's...

hello, We work on a topic concerning the RNS neurostimulator against epileptic seizures: http://latavernedes3i.free.fr/files/...20Valerian.pdf (RNS consists of a computerized device implanted into the skull with electrodes implanted in presumed epileptic foci in the brain. Brain electrodes...

It is a GREENLEE "GT-11 Voltage Detector" "50-1000V AC CAT IV" It has a little plastic encased metal nib on the end and it looks like a fat marker. You just stick it in an outlet and it lights up and beeps to indicate a current. There is no read-out, it just detects. Anyway, an outlet of...

Good Day All, I would like to know if anyone can help with the following; I am running it a few problems and I am not able to find the formulas that will allow me to prove my idea. I have a loop of 20 Gauge magnet wire; it's 24 inches by 2 inches. I'm using this as a detector, but i want to...

I am trying to recreate Young's double slit experiment and I can't figure out what he used to detect the photons. In some things I read it says he used a photographic plate. However, these are outdated and no longer available. Any ideas?

I know this is not possible but I want to know why. Why cannot a directional photon (or electron) detector placed on the screen of a 2 slit experiment detect which slit an individual photon comes from without destroying the fringes? Fire the photons one at a time. They can be detected...

Hi, I'm trying to find the range of α-particles in silicon; I can work out the stopping power, \frac{dE}{dx}, but the reference I'm using then states that I need to integrate it as follows: R=\int_T^0 (-\frac{dE}{dx} ) ^{-1} dE The thing is, I'm not sure as to how to even start this...

Hi please forgive me if you find that this is not the correct place, but since my work is of experimental nuclear physics and I didn't find a sub.forum in math neither engineering I decide to post here. Here is the question: in any track detector, the spatial accuracy of the detector is...

Hi, firstly I'm not sure if I'm posting in the correct forum, if not could I request that the moderators move it to the right one. Ok, so my problem is pretty much as I stated in the title. The background to this is that I have been asked to roughly calculate the number of alpha...

Im working in Pspice, I have an RF amp with a modulated input signal coming in on ~600kHz carrier wave and an amplified signal coming out, here is what the output looks like 1Megaohm load after a blocking capacitor to isolate AC: http://i.imgur.com/56NSI.png I am trying to use a simple...

IR Detector Question... If someone take an IR sensor and puts a red covered piece of plastic over the sensor...is that really going to significantly affect the performance? A friend of mine has a laser detector for road use and it appears to have a red plastic cover over the IR sensor...

Homework Statement I think I know how to do this but wanted to make sure before I actually make the circuit. Here's a general diagram: [PLAIN]http://forum.allaboutcircuits.com/image_cache/httphome.cogeco.ca~rpaisley4ComparatorWindow.GIF So as you can see I'm trying to make a window...

I am building a cosmic ray detector and I am following these designs: http://www.lbl.gov/abc/cosmic/documentation/CosmicDetector2-0.pdf I have a few questions for those who may be familiar with this. a) In the parts page (http://www.lbl.gov/abc/cosmic/parts.html) I see that the price for the...

How exactly do physicists detect if a particle goes through one slit or the other in the double-slit experiment? Every book and article I read seems to elude this part.

What is inside the detector in a particle accelerator?? We need E and B fields to steer and focus beams in a particle accelerator, but all the calculations we do in QFT assume (apart from the colliding particles) that we are in the vacuum state. Does this mean there are no fields at the point...

Hi, I am looking for a sensor/ detector (A) which could perform the following: constrain: transmitter/ receiver (B) size must be small so that it can be inserted in human bone to be detected later, diameter 3mm X 6mm length is preferred, however, a bigger size can be consider as well...

Hi! I have a plan to build my own version of young's experiment using various household items, a laser, and my physics textbook. My question is about what I could use as a "detector" to observe and collapse the wave function? I had the idea of making a tiny inductor to go around one of the...

If I could be inside the LHC Atlas detector during a proton bean collision what would I see? Would there be a huge flash of light? Would I be killed, if yes how fast? Or would there be nothing to see?

Hi, here's something seemingly rather simple that has puzzled me a bit. If i have a collection of thermal neutrons. They will follow the Maxwell-Boltzmann distribution. I guess this is a pretty good approximation for the energy spread of thermalized neutrons in water if one ignores absorption...

How would u work this problem? Q-If a RTD has a time constant of 10.0secs, approximately how long will the sensor take to get with 5% of the final value? I am thinking two ways to approach this problem. S1- It is known that the RTD takes 5 time constants to reach its final value, hence...

Homework Statement Determining the resolution for a new PIPS (Passivated Implanted Planar Silicon) detector. I've done this earlier for a Ge detector, but that was easy because the two peaks of the Co-60 are far apart. For this measurement we use the normal Am-241 source which has two...

Hi, I'm currently designing a mobile robot which is capable of detecting its surroundings and also any obstacles. I'm currently deciding to use IR to detect the range of objects. However I am using an ultra sound component for a different purpose on the robot, to analyse ground surface. My...

wiring in smoke detector...?... Hello Forum, simple question about wiring in a house smoke detector. It operates at 120 V. Two wires, the black (hot) and white (neutral) are enough. There is a 3rd wire, red, to interconnect multiple alarms: if one rings all the others ring too... The...

I am still searching the net for information on the actual hardware used for the which way detector(s) in the double slit experiment(s), and descriptions of the experiments as really performed in the real world. I am NOT referring to the "screen" at the pathway termination used to detect the...

Hello, I have read (wiki and physicsforums besides other sources) about how preparing an ohmic junction is hard on wafers in the clean room and that usually one gets a Schottky barrier instead, if one is not careful enough. This makes me wonder, how come that people used to get an ohmic...

Homework Statement Problem 2.11 of Liboff's Introductory Quantum Mechanics, 1st edition Suppose that you are inside a blackbody radiation cavity which is at temperature T. Your job is to measure the energy in the radiation field in the frequency interval 10^{14} to 89 \times 10^{14}...

Hi! I have a question regarding the applied voltage on NaI(Tl) detectors, how does the voltage effect the FWHM ( energy resolution)? For example, in a HPGe detector, the higher the applied voltage ( to some extent because of the leakage current) the more electron and holes are collected...

Hey there, I have problems trying to understand how a metal detector works. I don't understand why the inductance of a coil changes when a metal is approaching. Can someone explain that to me ? :redface: Thanks a lot for your help

Okay, I'm at work and I get a phone call from my daughter. Our smoke detector had gone off for no apparent reason. Unfortunately, it is the type that runs off of house current and the only way to turn it off is to turn the breaker off. However, that breaker also supplies power to the whole...

A particle with 900 keV get into the detector and was fully absorbed, how many pair of (e-, ion) are created if one pair required an average of 30 eV.? 900000/30 = 30,000 is this a right answer?

Homework Statement I have to make a scheme of a bit detector that detects the bit "1101" with a Mealy Machine. So I have made the following state diagram and state table(picture 1 and picture 2) http://img215.imageshack.us/g/picture1jf.png/" Now I don't know what happens in picture 3. How...

what is the meaning of Video bandwidh for rf detector?

http://cms.web.cern.ch/cms/News/2010/QCD-10-002/ http://motls.blogspot.com/2010/09/lhc-probably-sees-new-shocking-physics.html http://cms.web.cern.ch/cms/News/2010/QCD-10-002/CERN_seminar_QCD-10-002_introduction.pdf pg 14

Hello there, My p.c is currently infected with a virus called Pest Detector 4.1 and it will not allow mt to open any programs or open Internet Explorer.Does anybody have any ideas on how I can remove this from my p.c. Any help is greatly appreciated. Thanks, Dave,