Detector Definition and 279 Threads

Not sure whether or not this should go here, but this seemed like the most accurate place since my question is about how an instrument works. I have an old unused Waters 440 Absorbance Detector for HPLC that I've scavenged for parts to try to digitize an old polarimeter. What I'm trying to...

What is the typical efficiency (as a function of muon energy and/or rapidity) of a moun detector at an accelerator experiment? More specifically I would like to know about the lower energy treshold: E.g. if a muon with energy of just some few GeV is produced in the collision process, what is...

There has been a spate of writing in the popular media about the debates between scientific teams regarding various WIMP (Weakly Interacting Massive Particle) detection devices in the search for Dark Matter. (Example: http://www.nytimes.com/2008/04/17/science/space/17dark.html?ref=space from...

Homework Statement A detector hjaving a radius 10 cm is placed 1 m away from an electric dipole. What fraction of total solid angle does the detector cover and what fraction of total dipole power does it detect (assuming 100% detection efficiency) 2. The attempt at a solution I drew the...

Hi nerdy geeky folks, I have two questions: 1. can a regular cadmium-sulfide detect infrared in a complete absence of light (but a beam of infrared)? if not, what can be used to detect infrared (for a beam break sensor)? 2. I just want to make sure that I am building the circuit right...

I recently bought a phototransistor emitter and detector from radio shack: http://www.radioshack.com/sm-matched-infrared-emitter-and-phototransistor-detector--pi-2049723.html . It didn't come with much instruction but i thought i could simply put a voltage across the emitter and the detector...

In a response by Pervect to another topic, he mentioned a device called a Forward mass detector, named after its inventor Dr. Robert Forward. It's an intersting device with the claim that it can detect small gradients in the curvature of spacetime. I couldn't find any info regarding...

I thought you guys might find this interesting click http://www.nytimes.com/2007/04/03/science/space/03stat.html?_r=2&ref=science&oref=slogin&oref=slogin"This seems criminal to me.

<sarcasm>Since lie detector tests are very very accurate (like 99%), we should use them as an alternative for human grading. So what do you think? I believe it would obviously work due to the use of the lie detector test in law enforcement. It can save the teacher a lot of time because since...

Can i get some help with this problem? This problem deals with the basic loop configuration you will use in the laboratory to construct a metal detector. Two concentric circular coils of wire lie in a plane. The larger coil has 49 turns and a radius of a = 7.90 cm. The smaller coil also has 49...

hello, I have to make a sensitivity model for a near infra red detector and I need help. I have so far done radiometric calculations taking into account noise, due to dark current, sky background, etc and calculated the minimum signal intensity i need. However, i have a few blocks: I need to...

hi! a ball is dropped from a height of 1 meter above the floor. Take the origin to be the point from which the ball is released. would the graph be like a curved graph rising to the right starting from the origin? how would the graph look like if a car is parked on a steep hill? thank you

In industry, do you use gamma ray or beta ray to detect oil leakage?

Please guys I really need your help. How does a photo detector detect? Can you also tell me where you got the info from. thanks einstein2603

This may possibly be the wrong place for this, but I figure it's the closest area around since it's mostly software related I think. It may be a lame question, I'm not entirely at home in this area to say the least - this is a horizon streaching game more then anything on my part. For reasons...

Basic setup is a photo-detector coupeled with an amplifier. Questions is what are possible sources of non-linear behaviour ? Now, one possible source is obviously the amplification of background noise, but what other sources are there ? Alternatively could one give me a book or website to...

I'm not to sure how to do this question. Q. A 4MBq gamma source emitting 5 KeV photons is held at a distance of 5 cm from the end window of a detector. The diameter of the detector window is 3.5 cm, and the quantum detection efficiency of the detector is 15%. i)What is the geometric...

I'm trying to build this simple lie detector (picture below). I'm 90% sure that i have it built correct on my breadboard, but for some reason my LEDS are getting destroyed if i try applying the full 9V. It takes around 3V to make the LEDS to turn on about halfway. For some reason, there is a lot...

A stationary light source S wit ha natural frequency Fo is viewed in a mirror M by a stationary observer O. The mirror moves away from the observer wit ha velocty of Vrel << c a) what frequency of light is recorded by a detector attached to the moving mirror because Vrel << c classical may...

The proper article to use in the sentence "A/An NaI detector" I'm not sure if this is the best forum to put this in, but I'm curious, what is the proper article to use in a sentence such as "A/An NaI detector"? The source I found this from uses "An," probably because "NaI" is read letter by...

what does it mean with Linear range in detector of Gas Chromatography? thanks!

In a Minkowski vacuum virtual particles with electric charge (electrons, positrons,…) create and annihilate. If a detector is accelerated within the Minkowski spacetime, will it detect a radiation from the charged virtual particles? How to quantify this effect? Is this effect related to the...

some time ago i found this information http://www.spots.ab.ca/~belfroy/tachyonDetector.html on internet about a supposed "tachyon detector " . I have to confess that i believe this junk until a more deep study of electronics and amplificators led me to conclude that this is only a...

If a source and detector are moving towards one another, for the general doppler equation, would this be considered the source moving or the detector moving?

can anyone sugest me a good heart beat detector circuit. note the circuit must detect the current from the heart and LED display in a column. -Benzun

what kind of equipment do we need to detect cosmic rays? can i build something to detect fairly high energy cosmic rays in my basement?

..we recently got a smoke detector installed by the city. It seems to have some kind of an identity crisis.. it goes off every time we take a shower Sure, at least we regularly get the confirmation its still working not really my idea of practicality though..

Hello all I am new here, please pardon me if I have posted to the wrong board. My question should be fairly simple. I am building a fusor which I am hoping will generate neutrons from a D-D reaction. However, I have no way to detect them:frown: I was wondering if there are simple ways to...

What would happen if the slit experiment is done with three slits and at only one slit some sort of particle detecting or particle tagging device is placed and at the remaining slits no means of particle detecting is introduced. I know the results of two slits with and without two detectors...