Detectors Definition and 109 Threads

Hey guys, I have just moved into a new place for my university studies. There are smoke detectors in the apartment(kitchen living room and bedroom), I never had those things in apartments that I use to live. I am quite worried about the one in the kitchen, because I heard that while cooking a...

I recently learned about the electron double slit experiment, and I'd like to know more about the detectors used to track which slit the electron passes through. When the detector is turn on, the electron acts like a particle, and when it's turned off, the electron acts like a wave. I'm...

Hello, I am a business student currently collaborating on a technology project whose aim is to find alternative applications for a radiation detector made from artificial diamond. The main benefits of the detector are: • Ultra-fast response time • High durability in really harsh...

Hi, I am reading the great Knoll book about radiation detection and measurement, and I don't fully understand the difference in charge collection for gaseous detectors. Is it the collection of electrons or positive ions in the detectors, a) Ion chamber, b) Proportional counters, c) GM tubes...

Only but few may disagree that the inverse squared law affects speed. For example, not only lengths of far away vehicles shorten, (with increase in distances from obsevation) the moving vehicles generally seem to have "slowed" down; the direction either from right to left or vise versa. Please...

My professor has given me a project, figure out how to magnetically shield some detectors which surround a solenoid. Now, we have mumetal tubs which fit the detectors, but he wants numbers. The solenoid outputs a maximum of 6 Tesla, and it's in a dewer, so there's no way for me to perform actual...

This may be a dumb question, but I am still new the the concept of the quantum world... If we can't measure position and momentum precisely at the same time, why can't we use 2 detectors? One to measure position, and one to measure momentum. Have them take the measurement at the same time, and...

If cosmic rays include particles with energies way way beyond what is achievable with classic colliders like the Tevatron and LHC, why not build light collision detectors and have them carried aloft. AFAIK altitudes of 20km-50km are possible with present high-altitude balloon technology. At such...

Hi all, I have a question about the Unruh effect. I've read that a detector will only register the effect (i.e., the thermal bath) when the Rindler horizon is visible - in turn, a detector accelerating in a circle (changing direction but not speed) would not measure the thermal effect...

Question out of sheer curiosity: if there was a porthole in one of the LHC's detectors... would I see something? Like ghostly little sparks appearing out of nowhere, or would I be blinded by intense brightness? Also, I know the collision chambers are in vaccum, but say I went in there with a...

Hi, I constructed a device that consists of two metal pads atop a semiconductor material. I'm still confused on the whole Ohms law thing. Infrared radiation strikes the metal, and we're testing it at different temperatures, but I don't know what happens from there. My questions are: 1. Is the...

Hi all What are the problems associated with ex-core detectors in general? Particularly for fast reactors. Also, why they are needed ( why in-core is insufficient) ? Thanks.

Literally running out the door, but came upon this. It seems to be a really interesting avenue to test GR vs. other gravity theories using hoped for GW detectors. http://arxiv.org/abs/1204.2585

Hello, I have been trying to understand Roman Pot detectors, but I'm afraid I cannot understand what is going on even with diagrams and design specifics. (I have been looking at these: http://tdserver1.fnal.gov/project/workshops/crystal_collimation/talks/Convery.pdf and...

Hi, I would appreciate it if someone could explain these expressions to me. I was reading about Gas field detectors from " Radiation Detection and Measurements" for "Knoll" and paticulary in chapter five "The gas field detectors are commonly used in dose measurements. In this case, the...

Homework Statement http://www.thestudentroom.co.uk/attachment.php?attachmentid=118892&d=1329155852 (the most important aspect is the CHARGE) Homework Equations The Attempt at a Solution so we know that the first finger (using flemming LHR) is into the page but there are two...

I'm wondering how the use of spherical shaped detectors causes pincushion distortion. I can understand the shape of the detector affecting the final image but I thought the lines would bend out as when a hemisphere is laid out flat, a point appearing near the center from the front on angle would...

I've read that when one performs the double slit experiment (dse) without any detectors to "see" which slit the photon goes through one gets an interference pattern. When one places a detector to see which slit the photon goes through the interference pattern disappears. My question are these...

Do photon detectors necessarily need to absorb the photon to detect it (i.e. can photon detectors exist that make the detection but allow us to perform further tests on the photon)?

Metal detectors for searching metals in the ground How they work in one sentence explanation? and second, I've seen some frequency of about 8 kHz mentioned,could that be any possible health risk? Please discuss, thanks.

Hi there, I've been told even with detectors behind two slits detecting if a particle comes through, that doesn't exactly mean that the quantum system is now in a mixed-state (for example, the quantum eraser experiment of Scully). How would we be able to differentiate between whether the...

Hello Everyone I am currently studying the inductive loop detectors used in the traffic control department. I believe the data from the detectors is highly unreliable and noisy. A lot of research has been going on on the 'Fault detecting algorithm' and other means to improve the accuracy of...

Even if you send a buckyball molecule in the emitter, does the detector always give you output in terms of electrons? Isn't there a way to actually check the buckyball located in the detector? Because in normal double slit with electrons. One can argue that the emitter send an electron field...

I think I undetstand the role of the uncertainty principle in explaining the existence of interference patterns in the double slit expt with electrons i.e. the slits reduce the uncertainty in position and consuequently there is a greater uncertainty in momentum which results in interference...

And can the two run simultaneously?

I'm currently studying modern particle detectors, and was wondering whether someone on physicsforums could explain what transition radiation really is, and how exactly it is detected? My knowledge: - I've read that Cherenkov radiation is similar to transition radiation. - I understand how...

How it is with Gravity wave detectors, as LISA etc. Are they are prepared for gravity waves? How long they are active?

In the double slit experiment, a beam of electrons forms an interference pattern on a screen after passing through two slits. If you place a detector on one or both of the slits, the electrons do not form an interference pattern. In this video: Physicist Thomas Campbell makes the...

I am trying to figure out how Helium Leak Detectors work. If a leak detector is pumping on an enclosure that is at a low pressure, the detector will detect helium leaking into the system instantly as far as my human senses can tell. The helium will propagate 4 meters in a time so small I can't...

Hi Everyone, I'm trying to fill in some gaps in my understanding of the double slit experiment. I think I'm most confused about the detectors. Before I start asking questions, I'd like to spell out what I think I understand with a summary: --- Summary of DSE --- Equipment 1. source...

I have some questions about how silicon diode works, specifically as a ionizing radiation measurement instrument. I will write what my understanding is so far from different textbooks/websites (please comment whether I have it correct) and also write question where I get confused. Thank you...

Purpose of tracking detectors with "stereo design" HERA-B used silicon microstrip detectors for their vertex detector. Behind each two sided detector with strips in x- and y direction, a second identical detector was placed, rotated by 5 degrees. LHCb uses a similar design for the phi-detector...

Most smoke detectors contain an isotope of Americium (241Am), the nuclei of which decay by emitting an alpha particle. When a nucleus of Americium emits an alpha particle the principle of conservation of momentum and the principle of conservation of energy are obeyed. Show that the ratio (KE...

Hi everyone. I have a homework about the standard tests and procedures of qualification of a radiation detector that have to completed before it sent to space. Please help me about that topic asap. Thank you so much.

Metal Detectors! Guys I an Undergraduate student in Lancaster University (England) and I have a passion for metal detecting when I am not in UNI. Over the years I have spoke many of my lecturers and research staff about the depth of a metal detector and its soul destroying ability to pick up...

Hello: Can anyone please tell me how do they identify the particles in the detectors?+, for instance, how do you know if an electron is an electron and not a muon or some other negative charged particle in a detector (without using magnetic fields)?

hi all im new in this forum and i have a quick question: i need to know which motion detectors can i use to trigger inputs i.e , if a motion detector detects another motion detector , then it will trigger the input, otherwise, nothing will happen if the motion detector dosent detect the...

Is anybody can give me a detailed explanation or reference why the small bandgap IR detectors (eg. InSb photodetecotr) need to work in the cryogenic temperature? In addition, anybody knows what is carrier capture time? Since some article said the photodetector detectivity is proportional to...

Hi, I am new here and have a couple questions. First, If someone is standing in their house on a carpeted floor with rubber soled shoes on and they only touch the hot wire, will they get a shock? Also, can anyone explain how those pen voltage detectors work where you only have to touch one...

The little round battery operated one's, has anyone found one that doe's not sound off at the slightest whiff from the cooker, i mean i have one in my living room that is yards away from the cooker and that sounds off with no visible smoke about, even the one upstairs has gone off a few times...

From: http://www.bottomlayer.com/bottom/basic_delayed_choice.htm I refer to the above picture of the double slit experiment. I wonder what you would get if you added a third detector 5C in between 5R and 5L? Presumably you would get zero detects, because when you check the which-path, the...

"Ghost Detectors" So I work at a popular tourist attraction that is well known for being "haunted." Needless to say, I get a lot of people asking about ghosts. I don't believe in ghosts. I need some kind of evidence to acknowledge stuff of the kind. Anyway, a week or two ago this couple showed...

I'm working on a laser interferometry system that uses a pair of balanced photodetectors to record the signal. Each detector is on a separate port of a beamsplitter cube, and as a result receives (in theory) the SAME signal. The rationale for using the balanced detectors is that "they reject...

How do they discriminate between good (targets ) and rubbish, it seems that the orientation of the (Target) can fool the detector, from using one of these detector for many years , i find that the depth of the (Target) is instrumental in the discrimination, and only after years of (detecting)...

Do the neutrino detectors measure only the number of events but not the energy of the detected neutrino?

Homework Statement An RTD has a (wierd looking a) (20'c) = 0.004'C-1. If R = 106 Ohms at 20'c find the resistance at 25'c Homework Equations R=Ro(1 + (wierd looking a)(T-To)) Answer should come to 108.12 Ohms The Attempt at a Solution 20 / 106 = 0.1886 * 25 X

Homework Statement A smoke detector has a 92% chance of functioning properly. If there are 3 of these, what are the chances at least one of them will go off during a fire? Homework Equations Standard binomial distribution I believe. X~B(n, p) The Attempt at a Solution P(X>=1) =...

1) Do earth-based gravity wave detectors exist? 2) If so, how effective are they? 3) Has any gravity wave ever been detected? 4) Where are there such devices operating currently? 5) What is involved in establishing an earth-based gravity-wave detector? FWIW, an Australian...

I'm wondering what are the pros and cons of the CNT sensors and conventional gas detectors? I know that CNT sensors can detect very low chemical adsorption energy, which a conventional gas detector probably can't. Besides that, is there any more pros and cons of the two? Thanks!

http://arxiv.org/abs/astro-ph/0607621 An interesting look at the equiptment in use to detect DM.