Detector Definition and 279 Threads

[Mentor's note: split off from the thread https://www.physicsforums.com/threads/first-loophole-free-bell-test.829586/ as this is a general question about Bell's Theorem, not the specific experiment discussed in that thread] It says in the paper ... ... and the 'CHSH-Bell inequality' all...

Hello, A few days ago I tried to calculate the decay heat of Americium in a Smoke Detector, but as I was trying to find the volume it should have, my calculations showed that its volume should be really small (smaller than a cubic micrometer), but it was obvious that it couldn't be so small...

I just came across the user instructions for my smoke detectors and am surprised. I've attached a small section of the instructions. They're from a mainstream manufacturer and labelled with a British Kitemark. You can see that I'm not supposed to test it with flame, smoke nor heat, and the...

Hello, Every member: We need to IR sensor solution for our system. Please, connect to me If you know any company of product or maker about the IR sensor. Required specifications are as follows: (ps: choose one of the following five.) 1. Thermopile array #1: a. Pixel pitch: 0.6 mm b. Array...

Today's APOD shows an animated visualization of a gamma ray flare detected by The Fermi Space Telescope. The video says, "each circle represents one gamma ray" That language suggests single photon detection. Is that correct?

Good day!, today, i visited an Institute about Semiconductor devices, One characterization device (Reflectance Spectrometer) which used to determine the reflectance of the semiconductor materials. This device used Semiconductor detector to detect the reflected light from the sample, but I'm...

Hey all, I just read up on the principle of centrality, where "Think of a "network" as an NxN matrix, which has information about how N people (or N pages or N countries..) are connected to each other. Adjacency Matrix is an NxN matrix, let's say it looks something like this. People who...

Dear all, I would like to study more about the optical properties of scintillator detector in nuclear physics experiment. Is there any good reference for this? If the reference is discussed deeply in solid-state-physics, that is really nice. Actually, I am attending a "optical properties of...

Homework Statement A reactor fires out ##10^{21}## neutrinos per second. A detector containing ##10m^3## of liquid which contains 30 carbon atoms every 60 hydrogen atoms. The detector-reactor distance is ##1000##. The cross section for the reaction is ##\sigma = 10^{-46} m^2##, and the density...

How does a camera detector work? For example inside a room.. how does the equipment tells whether there is a hidden camera with ccd or cmos sensors recording video of you? Does it scan for the ccd/cmos presence or it absorbing the photons or does the detector send laser in every millimeter of...

What is the experimental outcome of a single photon or electron double slit experiment under the constraint that after each detection the detector material is reset to the original state ie, in the limit it is substituted by another detector sheet, or photographic plate. Of course that the...

Hi, I am working on CdZnTe detector. Can anyone please explain the function of bias resistor in radiation detector setup & how to select an appropriate bias resistor?

I was reading a closed thread here about the length contraction being real or not. The best I could understand my self is that space is the one that contracts, the final post by an experienced forum member saying something like its the space-time that changes, it rotates. But I still have to...

Homework Statement If one can approximate NOvA detectors being built out of hundreds of "sandwiches" or PVC plastic of 1cm thickness and a "plane" of oil of 5.6 cm, what is the range of muon of energy 200MeV, 500MeV, 1GeV, and 1.8GeV in the detector? Homework Equations \frac{dE}{dρ*x} =...

How the relative angular momentum of two particles can be detect by detector in two particle decay (center of mass frame)? I am curious about the signatures/differentiation between different relative momenta, means how one can decide that it is L=0, L=1,2,3,...? Of course the distribution would...

Just read a report on Muon to Electron conversion experiment ground breaking at Fermilab today. What kind of new physics one can probe from this flavor changing among leptons? http://www.symmetrymagazine.org/article/april-2015/mu2e-breaks-ground-on-experiment

hi there! I am nurul ain,new member here. I have a question regarding gamma ray detector, the high purity germanium detector or aka HPGe. What is meant by the detection efficiency at specific gamma-ray energy (εγ)? and whether the emission probability of the corresponding gamma-ray energy and...

I need electron transition detector that can respond to a dozen of photons.. so the atoms detector needs to be about just a dozen too.. I need something that can read it in an output.. what instruments is this? Geiger counter detects radiation by the click of the device.. I need something...

Homework Statement I need to make a circuit that detects even numbers. Need to find the equation for F when input A and B are both even. Input A: Word of 5 -bit signed representation in complement 2. Input B: Word of 3 -bit signed representation in complement 2. Homework Equations for B...

Homework Statement I am trying to understand how to obtain the estimated detection rate of a WIMP of mass 100~GeV into a Germanium detector of 1kg and detection efficiency of P_{eff}=70 \% . Homework Equations If you have at hand that the cross section is given \sigma = \mu_R G_F^2 (I...

I know I've done this before but for some reason I am stuck. I have a smoke alarm where the battery compartment is being blocked by the permanent power. I can't disconnect or a monitoring alarm will trip (i think?). There is a great deal of tension here and any more force I feel will break the...

Great project to do! DIY Exoplanet Detector with a DSLR

Homework Statement Hi all, I have been given the task of quantifying the energy resolution of a p-i-n semi-conductor x-ray detector and present it as a value in electron volts Homework Equations %Resolution=E FWHM / Ei Where E FWHM is the full width half maximum of a peak and Ei is the...

Hi, I'm working on fixing a preamplifier connected to a semiconductor detector. The high voltage bias supply is working ok, and the preamplifier preamplifies. I've confirmed this with a digital oscilloscope and a square wave generator under many different regimes. The preamplifier components are...

Homework Statement Of the people passing through an airport metal detector, 0.5% activate it; Let X denote the number among a randomly selected group of 500 who activate it. 1) What is the PMF of X i) Using th CLT (approximate PMF) ii) Using the exact distribution of X 2) P(X = 5)...

Can actually muons interact and give a signal while they go through the Hadron Calorimeter of the ATLAS? I think in general this isn't impossible, but it should depend on the muon energy... I would like to see that energy dependence, even quantitatively.

Just a simple question. How do we know the detector isn't messing up the double slit experiment when a single photon is shot out. When there is no detector we know the interference pattern is formed even with a single photon. If we add detector to see where the photon actually went through a...

Hello I am trying to learn something and really hope to get some help.. i know the use of envelope detector.. but when to use product detector? i know product detector will be more expensive than envelope detector.. please help

Ive attached the R ratio formula to this post, please could someone who is familiar with it tell me what Nc is? Does it relate at all to centre of mass energy? Thanks in advance for any help. source...

Homework Statement Which of the following best summarizes how a photoelectric detector provides an energy measurement: Answer choices: A) As light of multiple colors falls on the detector, the detector measures the energy of just one frequency of light by having a hole of only one...

So I'm a senior at a lesser known university, I 'believe' I did very well on my PGRE though I don't have my scores yet, and I've maintained a 3.7 average in my physics courses. The only thing holding me back from admission into a fantastic grad program is my complete lack of research experience...

What will happen to product detector and envelope detector when modulation depth is increasing?

Hello, I'm new here, but I've been researching this subject for several months now. I'm especially interested in the double-slit experiment performed with one electron at a time, particularly with the detection apparatus turned ON. I've found this statement, or something very much like...

So my PI suddenly decided she wants me to learn electronics. And so she started me off building a balanced detector. So here I am with this circuit I know nothing about, knowing nothing about electronics... Anyways, quick question on reading Op-Amps. In my circuit diagram, there are two...

hello I would like to know what is the different between half wave rectifier circuit and peak detector circuit.. as what i know from half wave.. it only take the positive wave only.. then what about peak detector ??

We have common detectors for radio, microwaves, visible, ultraviolet, xray and gammy rays.. but how about the infrared frequencies from molecular vibrations. The frequencies of molecular vibrations range from less than 10^12 to approximately 10^14 Hz. These frequencies correspond to radiation...

I'm making a system with PLL. Here's more or less a principal scheme. What happens here is that the signal in this compensating system becomes really low and phase detector might not work properly. What I want to ask, what type or how to make a phase detector which can detect phase correctly...

Where would you use our new radiation detector? We are a student team from the Vienna University of Economics and Business. Currently we are working on project with the research center CERN and try to find different application possibilities for an innovative technology by interviewing...

Hi All, Just reading up on methods of neutron detection and something struck me. Generally these types of detectors are manufactured small enough so the the ranges of the charged particles (usually tritium and alpha) are smaller than the dimensions (so around 100microns or so). This means...

Homework Statement The resistances: Ra = 10 ohm Rb = 10 ohm Rc = 10 ohm Rd = 8 ohm Battery = 10 volts Voltage across detector = ? Homework Equations V = IR (series) R = R1 + R2 + ... (parallel) 1 / R = (1/R1) + (1/R2) + ... The Attempt at a Solution So to get the...

Greetings friendly physics folks, I could use some advice and/or general suggestions regarding a data visualization project I'm looking to get started on. If this looks like too much reading, please skip to the TL;DR below. The basic project components are: (1) A GUI of some kind...

I am building a positive peak detector circuit using AD829 opamps. I have attached my current circuit I built in multisim. I used a "superdiode" configuration on the charging circuit so that I simultaneously get the charging across the capacitor, no discharging during the falling edge, and...

Say I have a radar transmitter on a car,used to detect its distance from a car in front of it by measuring the doppler shift on the reflected wave. i.e Car 1 is the source, its wave gets reflected by Car 2 in front of it. My book splits the problem of calculating the Doppler shift by computing...

I have a linear model of a phase detector (phase lock loop) represented by the block diagram below. It is designed to maintain zero difference in phase between the input carrier signal and a local voltage controlled oscillator. Phase demand→Ka→F(s)→K/s→Phase output F(s) =...

Hi to all, I have the following problem: I want to characterize two lots of detectors in order to retrieve their mean cross section and standard deviation for a proton beam. For cross section I mean the number of counts respect the fluence of particle (fluence = integral of the particle flux...

Hi, Iam working with a High purity Germanium detector and have an issue with the dead time. I let the detector do a background measurement over the weekend, about 55h. When I checked the measurement 60h had passed and the measurement was not finished due to dead time about 20%. At the start...

Suppose we have a Stern-Gerlach apparatus through which we send spin-1/2 particles and subsequently measure their position. If a passing particle "collapses" to the spin up state about X, it moves "up" and is registered by detector U, otherwise it "collapses" to the spin down state about X and...

Homework Statement A sound source, detector and a movable wall are arranged as shown in the figure. In this arrangement detector is detecting the maximum intensity. If the speed of sound is 330 m/s in air and frequency of source is 600 Hz, then find the distance by which the wall should be...

Can these TV Licence inspectors actually tell if a person is watching TV in their home? They even claim to tell what channel a person is watching. If so, then how exactly do they do it?

I'm trying to build a simple circuit to detect when a lamp (tail light) is burned out, and light an LED in the dash. I think I can use a couple op amps but not sure how. My plan was to connect non-inv input to the (-) lead of the lamp socket and the other input to chassis ground. But I...