Detection Definition and 339 Threads

Hi all, me again! :rolleyes: I'm trying to calculate the current created when an alpha particle strikes a silicon p-n detector, but I'm getting some strange numbers, so I was wondering if I was doing something fundamentally wrong... My problems start when I try to calculate the reverse...

1. I need to detect amino acids and nucleotide bases that MAY be present in small quantities on Titan in the Hydrocarbon seas Homework Equations Not required this is for a mission analysis class The Attempt at a Solution So I'm working on a project for my fourth year class in...

So I'm working on a project for my fourth year class in Space Mission Design and Analysis (I'm a fourth year space systems engineering student). My project is an astrobiology mission to Titan, Saturn's sixth moon, which is only slightly smaller than Mars with a atmosphere of Nitrogen of...

I am running a project on trying to find a method of detecting splits that are present in pressed metal. The system is to be placed into a manufacturing press line of car panels that will automatically detect and notify when a split has occurred during production. Some methods I have come...

In CCD detection, is integration better than accumulation Hi, I have carefully experimented and found this to be a true observation with CCD detection in general. Signal to noise improves if one integrates a signal (e.g. over x seconds) versus accumulating over many short integration times...

I want to detect all zero-crossings in a sine wave through matlab. Kindly tell me about a simple code which detects all zero-crossings and stores them in an array. The sine wave is continuous time signal, not discrete...

Anyone ever install SE 704 Earth Detection (ground fault system)? 4160V 3 phase 1900 HP motor detection level 100 Ma resistance grounded supply max fault current 1 amp. Nuisance tripping when starting the motor.

Does anyone know how the progress is on the attempts to detect gravitational waves with interferometry? As far as I know there are only null-results up to this date, but maybe I am misinformed? The recent supernova in the galaxy Messier 101, should it generate gravitational waves of...

I'm writing a physics simulation/game in java applets, I have a quick question about collision detection. DISCLAIMER: I am not a math or a CS major, so this is probably a ridiculously easy question for most people on here: My question regards speed when there are lots of objects. Right now...

Dear all, I have two questions for you: 1: As in known, in the case for transition and rare Earth elements, different valences lead to totally different properties. It is said that XRF can only detect the concentration of a certain element, but can not distinguish the valences of this element...

It is promised that the quantum coherence will help to improve various measurements. Is it theoretically possible to improve detection of neutrinos with help of quantum coherence?

http://en.wikipedia.org/wiki/Coherent_state#Quantum_mechanical_definition From the link above: "Physically, this formula means that a coherent state is left unchanged by the detection (or annihilation) of a particle." My question is, why is detection of a particle equivalent to...

I am designing a laser targeting system on which various control methods will be implemented and compared. The system consists of a laser pointer mounted on a two axis gimbal. The laser shines on a 30 cm x 30 cm white screen, behind which is a digital camera. The camera sends all information...

Is there a simple method or inexpensive hand-held device available for Hydrogen gas detection?

I have heard that autocorrelation is used in pitch detection, but no proper or convincing explanation of how it is used. I had previously worked on echo removal using autocorrelation. But what puzzles me is that autocorrelation is done in time domain but how can this be used to detect...

Here are some recent papers on attempts to detect dark matter directly or indirectly: a solar system test with a possible positive result: http://arxiv.org/abs/1001.1697 direct detection, with seemingly contradictory results: http://arxiv.org/abs/1106.1066 via gamma-ray astronomy...

I have a vessel (~2 liters) that is filled with gases for combustion. It is made of some sort of steel and has various ports drilled out for diagnostic instruments. The vessel is spherical and is made from 2 hemispheres with flanges that are bolted together. An o-ring helps to seal the...

Hello. I used discrete electron multiplier (dynodes) for positive ions detection, and it works fine. Now I want to use it for electrons detection with no changes in mode of connecting power supply (-2 kV on 1st dynode, 0 V on last one) . In the past application I don't use the reflector...

I have created a very simple numerical simulation that models an object being thrown off a building at some angle, and when the object hits the ground, the simulation stops. Now I want to add in collision detection. How would I go about doing this? What would be the equations needed to compute...

what are fatigue cracks? what are the major sources of fatigue withing the fuselage? how can fatigue cracks be detected during inspection? how can the risk of fatigue cracks in the fuselage be reduced? why are they dangerous? what is their origin? I've tried to find answers for these...

One of my high school students recently demonstrated that the camera in an Android will detect the IR signal of a remote control, but the camera in an iPhone will not. (I understand that screening out IR is desirable in photography, and the distinction is arguably a matter of camera or filter...

I'm specifically wondering: Can proteins in the mitochondrial matrix be detected by immunohistochemistry? I am familiar with the general techniques required for IHC, and I believe the procedures vary depending on what you're looking for. I do think that IHC can stain within the mito-matrix...

Hey guys I'm looking for some good reading material on the following extrasolar planet detection techniques (not sure if there are any other...) Radial velocty Transit monitoring Microlensing Detection of IR thermal emission Direct Imaging. Basically I'd like to read about what these...

Hello Can anyone explain to me what measuring quadratures are in relation to homodyne detection? Thanks

Hello guys I was a confused by this part of the Wiki article on "Double-slit experiment": It seems like all the (popular physics) accounts I'm familiar with go out of their way to endorse exactly the point in question. Is the author of the wiki article trying to impress that "detection" is...

OK...I'm not sure how well I'll word this or if it's a coherent idea biologically but I'll throw it out there anyway... Regarding the evolution of senses - let's take the detection of sour tastes as an example. I know little neuroscience but I know that there's the involvement of H+ ions as the...

Refer to the delayed choice quantum eraser (DCQE) ...for example the kim paper http://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser" i have a few questions, to understand this better, 1. Once the signal photon has been detected at D0, can the path of idler photon be...

(This a new thread as proposed by Borek post #2349) Neutrons and neutron "beams" are very hard to detect with portable instruments. The most common portable instruments are gas proportional counters using thermal neutron capture in BF3 (boron tri-fluoride) or He3 gas. Proportional counters...

Hi, How am I suppose to tell a computer what an undercut is? I myself am finding it hard to classify different features on a job as an undercut or not. Please help.

Is there any relatively not difficult way to detect if hydrogen peroxide (H2O2) is present in pure water? I can think of a few obvious ways for high concentrations but what about concentrations of around 0.001mol%? Is there a way of detecting concentrations that small or smaller?

Homework Statement I have the task of finding the first peak (percussion peak) per each period of a ICP signal. I was told to filter the signal to get rid of some noise and a dc offset, find the percussion peak indicies and then plot those back onto the original signal. I am unable to only...

RedZone, Second Life IP Address Detection Tool, Runs Afoul of New SL Policy, EU Data In an odd turn of events that is all too common online these days, an ingenious system created for Second Life land holders to reduce incidents of harassment and abuse by malicious griefers has itself turned...

http://www.scientiaweb.com/2011/02/28/smartphone-app-that-helps-doctor-detect-cancer/ Researchers at Massachusetts General Hospital in Boston have developed a system to detect cancer in a patient that will save them from many painfully long tests needed otherwise.

Let's say you have two pulses from the same source, one whose phase is slightly delayed relative to the other one. Now, I know that you can use an interferometer and a balanced detection-type scheme to measure the phase shift (in which case you can be shot-noise limited), but I'm wondering if...

1. I have a problem like this: I. As you see (in the attachment) each of the closed polygons (as in the attachment) is called a BAY II. The logic I need is: The user of my program will select a bay (with a mouse). And after selection he would want the program to draw some vertical (or...

Hi all. For a project I am doing, I need to find a motor with an encoder that we can use to detect the exact angular position of the shaft at any given point in time. I'd like to see if there is any motor out there with absolute feedback from the encoder - i.e., that I would be able to read...

Homework Statement You are to design a coating to enhance the detection efficiency of a silicon detector (n=3.42 at \lambda=351nm) (a) Is the coating a reflection or antireflection coating? (b) Should you use a higher or lower index material for the coating? Specify a material to use. (c)...

Hello, this is my first topic. but i was thinking, Theoretically if you have a way to detect radiation from far distances, couldn't you detect the radiation from black holes?

Can anyone suggest to me a simple circuit constructed using digital gates for polarity detection? The circuit should be able to detect positive, negative as well as zero polarity. I need to check the polarity of a dc motor which is controlled by a bidirectional converter. The bidirectional...

Homework Statement You are to design a coating to enhance the detection efficiency of a silicon detector (n=3.42 at \lambda=351nm) (a) Is the coting a reflection or antireflection coating? (b) Should you use a higher or lower index material for the coating? Specify a material to use. (c)...

I hope this is in the right section of the forum. I figured astrophysics and cosmology could also be acceptable places to ask this. I was watching Lawrence Krauss's talk about everything from nothing, the one with the richard dawkins introduction. He talked about methods for trying to detect...

i m designing a MATLAB code for detection of heart murmurs... i applied segmentation using wavelet decomposition and reconstruction now i m doing peak detection can somebody help me how to do peak detection in matlab

Is there an experiment that uses photons or other particles to measure the effect of Earth's rotation on them? Thanks

(1) In the double slit experiment, if I fire individual electrons at the slits, is there a chance that an electron could interact with one of the atoms making up a slit in such a way as to alter the energy state of one of its shell electrons. i.e. I could imagine there is a probability of...

I want to know the ways newly created particles are detected during collisions such as in LHC or Fermilab, i.e either they check the EM force, electric charge being observed or other things...

I wanted to get some insight about which direction I should look in about Network Detection anomalies. I have been doing some research and I have found CLAD (Clustering and Anomaly Detection) which is an algorithm, however, I'm trying to find something simpler to understand to implement...

Hi I am trying to develop a standing wave inside a rectangular cavity and detect it using a microphone.In one wall of the cavity ,I placed a loudspeaker and driving it at a frequency of 8.3 Khz. The chanel has a thickness for half wavelength standing wave. I am trying to detect the nodes...

Greetings, currently I'm working with cosmic rays (merely researching, not so much as working) and now I have a question regarding cosmic rays and cosmic rays detectors (specifically, Cherenkov detectors). How is the number of photons detected by the PMT's (photomultiplier tubes) related to...

Hey experts! I've designed an infrared detection circuit to drive a motor, but I need the circuit and my math checked. I tried 5Spice, but I can't get my head around it. Circuit image attached. Do you know about how far I would be able to detect someone crossing in front of the light? I need...

I'm trying to figure out the best way to find a collision between a moving circle and a stationary line segment. I have the x and y of the point, and the x, y, radius, x velocity, and y velocity of the circle. //Edit: I tried using the equation of a circle with the origin at the point (P)...