Detector Definition and 279 Threads

Homework Statement A collection of neutrons, nominally at rest, are confined in a region 1.0 nm wide on the x-axis at a height of 50 cm above a neutron detector. The neutrons are released and fall under the influence of gravity towards the detector which records the horizontal position of the...

If an enemy had a secret nuclear reactor and they were retrieving the rods, or whatever it is that they retrieve to make secret nuclear bombs, how much time (how fast) would it take for them to retrieve their needed material? Would just a part of the reactor be shut down, and if so, what...

Homework Statement The detector is made of two co-planar layers of silicon two metres apart, and there is a plane of wire chambers halfway between them. The wire chamber can measure a track with precision ##100\mu##m. What is the highest momentum a particle can have for which the detector will...

I would like to know the results of a few scenarios with a beam splitter. (1) You send a single photon through a half silvered mirror with a reflector at either side, as above, but instead of having two detectors, and a 50% chance of either going off, you just have one detector, and where...

Hi. I have a very embarrassing question to ask. I was changed the battery in my smoke detector, which is the sort that uses americium to work. I have a bad habit of chewing and swallowing my nails, and also picking and my nose and swallowing the stuff from my nose, too. I'm paranoid that I...

Hello I found this video on YouTube, It seems that most of the counts are noise of the PMT... Thank you for your time. Regards.

Hello everyone, I am Ashish, a mechanical engineering graduate from Arizona. I am doing a case study on some of the design related flaws in a high purity germanium detector. The information and pictures that I am posting is of an old detector from one of the manufacturers and it is currently...

Hello, I am a civil engineering student undertaking a project to investigate the effect of pipes and pipelines beneath the ground on the urban city environment above. In order to proceed I am designating a simple metal detector. Due to low depth capability of all commercial metal detectors mine...

ie: http://m.eet.com/media/1072296/RFFig84.jpg I am 99% sure the answer is: no, it can't. I've read that DSB-SC demodulation requires the carrier frequency to be put back into the signal at the receiving end prior to demodulation (or as part of the demod process), and that if its too out of...

I am currently working on a small personal project to design a few circuits. I am trying to built a circuit that can detect 100 uV pulses with a pulse width of about 10 uS. I'd like to boost the voltage to a value readable by an FPGA (let say ~2 volts). I'm currently thinking about the...

In the double slit experiment , if one place only one detector around one slit, while leaving the other slit unchecked, the interference pattern vanishes. Does this show entanglement?

What are the most accurate smoke detectors have you come across and can recommend and why? Are there different types of detectors (I want to avoid the radioactive ones but are others less accurate)?

Hello! How is the count rate of a detector defined (I need for a scintillator)? It is just the number of particle hitting the detector per second times the efficiency of the detector at that energy?

Ivette Fuentes and her group are attempting to use phonon excitations in BECs to detect gravitational waves. Their GW-detector is called MAGA, which stands for Micrometre Antenna for Gravitational-wave Astronomy. Here's a video of her explaining it: More from their blog:

Hi, I am studying a positive sequence detector and have some trouble understanding it. I understand most of it, but the author in the book "Instantaneous Power Theory and Applications to Power Conditioning" writes: For extracting the fundamental positive-sequence voltage with the dual method...

Homework Statement A beam on Pions, Kaons and Protons, all with momentum ##\mathrm{P} = 10 \mathrm{GeV}## and negligible angular divergence travels ##100 \mathrm{m}## before hitting a target. What is the required timing resolution of the detector so that pions and kaons can be distinguished...

http://science.sciencemag.org/content/355/6326/673?utm_campaign=toc_sci-mag_2017-02-16&et_rid=34818699&et_cid=1169695 Bummer :frown:

So I'm doing some research for a physics essay on particle accelerators and I don't want to go into too much mathematical detail (as I haven't studied statistics or higher level Physics at school yet), but I have googled a lot of things and nothing seems to come up for methods scientists are...

Dear all, This is my first post and I'm not sure if it's the right place to ask so don't hesitate to advise if necessary. I would like to know if it's possible that an optical detector (the complete system including sensor and front-end electronics) has a better sensitivity at medium flux than...

When was it first experimentally seen that particle detectors can change the interference pattern effect expected in a double slit experiment? Is it still theoretical? What were some double slit experiments in the early era of quantum mechanics? How were they handled?

Hi. I'm curious about how a PSA (polariser-sample-analyser) ellipsometer works, especifically the detector bit. In an ellipsomenter, light passes through a polariser which puts it into a known polarisation state. After that it hits a sample (which may be an interface, a surface or a thin film)...

Homework Statement A source emits sound with a frequency of 860 Hz. It is moving at 20.0 m/s toward a stationary reflecting wall. If the speed of sound is 343 m/s, what frequency does an observer riding with the source hear? A 860 Hz B 913 Hz C 910 Hz D 765 Hz...

So we are doing Radioactivity lab at second year undergraduate. I am confused about the workings of the silicon radiation detects we are using even though the demonstrators tried to explain. We are detecting beta and gamma radiations by placing sources above a silicon detector that have a small...

Homework Statement Using a single 74x138, build a 3-bit, active-low, odd-parity detector. (Y0-Y7 are selected by "b2 b1 b0" in binary. Also the nibble "0 0 0" is considered even parity) You may use one NOR gate and one NAND gate, with arbitrary fan-in(>1). Label input variables "I2 I1 I0" and...

Is it possible to create a series of circuits capable of detecting a moving object with 3 levels of proximity e.g. green light when object is 10ft. away, yellow light at 5ft., red light at approx. 1ft. away, etc? Thanks, Dave

Hello, I am building a power bank myself and want to set put detector that determines the voltage level and indicates it in LED (4 LED are planned to be used). I know how to make it with transistors and op amp. But I was wandering if there is any IC chip that does it? Thank you, Akmalidin Alimov

Hello, I'm looking to build a metal detector. I shant get into all aspects of it, just the first for now. I have a BSc Physics so you can get mathematical if you want but not much electrical experience. I need an LC circuit to build a beat frequency oscillator metal detector. It should...

A simple harmonic oscillator model consisting of two masses connected with a massless spring is provided in [edit] I hate cut and past on the mac. Always seems broken Slide 30 http://webs.um.es/bussons/GW_lecture_KG.pdf The left hand side of the equation of motion is simply the classical one...

Hell all, I need a help in understanding the electrical connection of a scintillator, a detector for detecting/counting gamma rays. In the back side of the detector there are three connections, 1. a high voltage supply, 2. to amplifier or preamplifier or single channel or multichannel analyzer...

A question that actually makes me laugh, but ... how long is the ATLAS Detector? Based on the ATLAS page here: http://atlas.cern/discover/detector the detector is 46m long. Based on references like here: http://arxiv.org/pdf/0910.3081.pdf the detector is 44m long. I wouldn't have asked this if I...

Homework Statement simulation of bersiv function of NaI detector it's in cylinder of water with volumetric source of Potassium40 (90% beta 1.31 mev & 10% gamma 1.504 mev ) how candefin define electron and gamma Volumetric source in mcnpx (6) ...

I am currently studying the MicroMEGAS detector principle. Ionizing particles traverse the space of around 6 mm of Ar:Co2 mixture in the detector (10x10cm2 x 6mm) like in the picture below. A cosmic muon (4GeV) enters this space and ionizes along its path. I assume the longest path it can take...

I was reading about track reconstruction. So, I read about the "inside-out" and "outside-in" strategy for track reco. However both those strategies utilize information coming from the InDet parts... I know though, that the Muon Chambers are also used for the track reconstruction in ATLAS. How is...

Hi, I want to test this radiation detector http://www.teviso.com/en/products/radiation-sensor-rd3024.htm The problem is we don't have strong nuclear radiation sources or even weak ones , can i mimic the radiation ?? For example can i use Microwave sources or RF field or other radiation sources...

I'm trying to make a LSC with U-238 (non-aqueous form) dipped in the scintillating cocktail to detect fast neutrons (no thermals or epithermals, only fast) from a Cf-252 source. How do I calculate the wavelength emerging from the cocktail (assuming U-238 does not react with the cocktail)? Also...

How to build Non-contact DC Voltage detector/sensor?

Hello, I've been learning about Quantum Key Distribution recently, but I can't seem to find the logic in one of the steps... maybe I'm just having a brain block. o_O So let's say Alice has sent a stream of entangled photons to Bob, and he finishes measuring them and is left with a binary code...

Does all the signals detected by He-3 detector caused by neutrons? When the He(n,p)t reaction occurs, will proton cause any secondary x-ray photons since it de-accelerates in matter.

I bought this electric field detector that can detects minimum of 3V/m. It said the human body can emit electric field.. so the detector can detect the presence of someone on the other side of a wall. May I know how the human body can emit electric field.. and is a detector with a 3 V/m really...

Homework Statement Recently I have conducted an experiment using a gamma source (22Na) and a scintillation detector (NaI), at the start of the experiment one of the desired outcomes was to see that the intensity of the source fell off as 1/r^2. Seeing as the detector is not point like (I am...

Hello everyone. Is there a type of radiation detector that can tell the energy level? I have a basic understanding about Geiger counter and Scintillation counter, they seem only tell the incident particle number. The testing environment may contain Thorium series, Uranium series and Actinium...

https://www.amazon.com/dp/B004Y6V5CI/?tag=pfamazon01-20 I bought the above carbon monoxide detector out of curiosity.. it has over 1,500 positive 5 star reviews. I put it near the exhaust in the mall parking and sit inside for 20 minutes.. but it doesn't seem to detect any carbon monoxide...

Hi! I was reading this article about the possibility of detecting removals of "double-use" fissile materials from a known reactor using an antineutrino detector deployed in a truck "that uses 20 tons or less of scintillator material (and) could be fit into a 6-meter shipping container and parked...

I thought it would be an interesting project to build a detector that will measure and log the outdoor atmospheric CO2 levels. These (global average) levels are currently about 400ppm and these (global average) levels vary by a few ppm every year. Looking for a sensor though, I can't seem to...

Homework Statement A detector is used to count the number of gamma photons emitted by a radioactive source. If the number of counts recorded in exactly 20 seconds is 10000, the error in counting rate per second is (a) 5.0 (b) 22.4 (c) 44.7 (d) 220.0 Homework EquationsThe Attempt at a Solution...

Hi Guys, I studied physics for my bachelor but still I am not a super expert, although I am still working closely to physics (but not so much astronomy). I was wondering if it would be possible to build a radio, or some other devise (any ideas?) that could be tuned at the frequency where the...

Hello everyone, I actually have three questions: 1. Am I missing an important detail in my understanding of how the delayed choice quantum eraser experiment is done? 2. How does one account for what takes place in the experiment without using the concept of "retrocausality" (effect before...

I am having trouble understanding how a gravity wave detector can be de-coupled from the wave it is intended to measure. For the sake of conceptual discussion, if I am eyeballing a ticking clock some distance away and a wavefront hits the clock and say 10 or so waves pass through the clock...

Homework Statement A thin ring (radius r = 1.41 cm) carries a charge Q = 8.57 pC distributed uniformly along its length. The ring lies in the y-z plane, so the axis through its center is the x-axis . A small detector is moving along the positive x-axis toward the ring at velocity v = -0.543i...

I have a question about how the double-slit-with-detector experiment works out with a beam of light. (1) When you fire electrons through the double-slit apparatus, it creates an interference pattern on the screen. (2) When you place a detector at one of the slits, the interference pattern is...