Detector Definition and 263 Threads

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..

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...