Questions tagged [experimental-technology]

Use this tag for questions pertaining to the limits, management, and operation of equipment necessary to experimental physics. This tag is not intended for "does this thing I heard about actually work" type questions.

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How close were the slits in Young's experiment? [closed]

How close were the slits in the 1801 Young's double slit experiment and how could the scientists manage to produce such a microscopic precision while manufacturing the apparatus with the 1801 ...
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The critical point of gold — how did they measure this?

I was looking up something far more mundane and noticed this: https://en.wikipedia.org/wiki/Critical_point_(thermodynamics) ...
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1answer
54 views

Mass of the fundamental particles

I have always wondered that how do scientists measure the mass of a fundamental particle. Obviously they can't weigh it in a conventional machine we use to weigh other things in our daily life. And do ...
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Is Thibado’s Graphene Brownian Capacitor Charger Perpetual Motion of the Second Kind?

In Fluctuation-induced current from freestanding graphene (peer-reviewed version on Phys. Rev. E, note: behind a paywall) Thiabado, et al, report the extraction of work from brownian motion. The ...
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3answers
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Would a hypothetic very fast camera allow to visualize the variations of the amplitude of visible light?

The fastest camera available so far is capturing 10 millions images per second. https://www.shimadzu.fr/hyper-vision-hpv-x2 In the scenario of the currently known physics, but in the hypothesis where ...
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1answer
77 views

What is the smallest time that the current technology can measure?

Many physical phenomena are associated with unbelievably small time scales. Let me give a few examples. The time scale associated with visible light is $\sim$ a femtosecond ($10^{-15}$ sec), The ...
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32 views

What are the properties of the Rice University self-assembling wires?

I've recently watched a video from Rice university, (https://www.youtube.com/watch?v=w1d0Lg6wuvc&t=3s) where they used an electric field to remotely stimulate CNTs to form a wire. This wire was ...
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1answer
110 views

How to produce light of a certain wavelength?

Is there a device which takes as input the wavelength or frequency value and produces electromagnetic waves of the given wavelength or frequency using an emitter? It might be that the wavelength range ...
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1answer
131 views

What piece of technology is able to record the exact phase of microwaves?

I read that in VLBI, the signals of microwaves are recorded and then later combined. A famous example of this is the Event Horizon Telescope which imaged the black hole. Presumably, the telescopes ...
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How can I create gamma rays with energy >2MeV?

I have been exploring pair production (electron/positron) using gamma, and with a Cobalt-60 source this is easy enough. That's just the problem, though. I'm looking for a challenge. I want a stream ...
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How the relativistic mass gain prob is overcome in synchrotron by adjusting the frequency of electric field to accelerate particles to high KE?

Cyclotron cannot accelerate particles beyond certain KE due to relativistic mass gain. I am from Chemistry background.
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For experiments, how to ensure two photons arrive at beam splitter at the same time?

I'm working on work related DLCZ protocol. In DLCZ protocol, a beam splitter will be settled in the central of two ensembles (you can think it as light source). Ensembles will emit photons ...
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271 views

How is a spectrometer is calibrated for intensity?

For the case of spectrophotometers, we can easily calibrate the device(intensity wise) taking the light source inside the device as the reference, without any need of precise knowledge about its ...
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111 views

Relation among the dead time, recovery time and resolving time of a GM counter

I have been researching a lot for my assignment about the relation among the dead time, recovery time and resolving time of a GM counter. Most of the articles I came across have varying definitions on ...
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1answer
32 views

Why photodiode measures random phase superpositions on continuous-wave (10kHz) white light?

I measured a 10 kHz modulated white light using a photodiode (Thorlabs PDA10A): Unexpectedly, the photodiode output sensitively depends on the orientation and position of the photodiode. For two ...
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118 views

What are the ways we have control over single photon emitters? Are there single photon emitters “on demand?”

I am wondering what are some of the ways we have been able to get more control over single photon emitters. What advances in technology have we made over the past years? Is there anything that ...
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1answer
37 views

Do we need to know Earth's magnetic field locally?

I'm a high school student and in our course we have elements of earth's magnetic field (dip and other stuff) that lets us know the value and direction of magnetic field at any point on the planet. I ...
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150 views

What is the most efficient single-photon detector to date?

(This question depends on the current time period, so the reader should make note and be aware of the date of the posted answers.) I am wondering what is the most efficient state-of-the-art single-...
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2answers
166 views

How Do Scientists Measure Subatomic Particles? [closed]

I'm asking for a list of experiments, machinery, technology and techniques. The only measuring device I really know of is the Stern-Gerlach contraption. Google hasn't been helpful (it only gives me ...
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Why doesn't a lock-in measure the full voltage from a function generator? (3$omega$ setup)

I'm trying to build a setup for the 3$\omega$ technique, and the equipment is making my brain hurt. When I send a signal directly from the function generator to the lock-in, it only measures about 71% ...
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1answer
75 views

What accelerator energies and types would be needed to explore electroweak unification, and if accessible, what would be the likely observables?

Question originally referred to electrostrong, but I actually meant to ask about electroweak. Edited to fix, but this is why there's an answer referencing ES not EW - that's my bad. Broadly as the ...
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1answer
43 views

Unknown pulses from SiPM without any source or detector?

I have a SiPM set up with its PCB, no amplification at all, reading out to an oscilloscope. If I supply 29.8 V, which is the maximum power (with overvoltage), I get some random peaks on the ...
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Error in FFT (Sectrum) analyzer Instrument

Recently I performed an experiment on finding the natural frequency of vertical cantilever. I used accelerometer and FFT analyzer instrument for measuring it. First I kept the accelerometer near the ...
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1answer
41 views

Infrared pass material thermal camera

I have a situation in which I need to use a thermal camera in a rain enviroment, the camera is mounted on a gymbal and can rotate 360 degrees, so I tought it may be an option to build a dome in order ...
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1answer
674 views

Strain gauge vs linear variable displacement transducer

For measuring deformation experiments, it seems that strain gauges and linear variable displacement transducers (LVDT) are commonly used. If the material exhibits geometric linearity, then couldn't we ...
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3answers
179 views

Tagging the photons on double slit experiment [closed]

I stumbled upon the double slit experiment. It was very interesting to the say the least. The video stated that when being observed the electrons act as particles rather than the wave because they ...
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The category of physical instuments [closed]

A physical instrument is used to measure physical systems and return the values for those measurements in classical data. I was wondering if anyone here has been looking at instruments in terms of ...
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121 views

Silver telescope mirror restoration

Our physics department has recently acquired a 26 inch diameter silver telescope mirror that is quite a bit tarnished. Would attempting a light bit of polish be possible before we try to resurface ...
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144 views

How much can we currently squeeze light?

In quantum optics, the single-mode squeezed vacuum is the state $$\hat S(z)|0\rangle=\exp\left(\frac{1}{2}\left(z^*\hat a_{\mathbf k}^2-z\hat a_{\mathbf k}^{\dagger 2}\right)\right)|0\rangle$$ where $...
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32 views

How to synthesize a material at 2000 atmosphers?

I am trying to combine various elements and at high pressure, e.g. $2000\,\mathrm{atm}$ or $2 \cdot {10}^{8} \, \mathrm{Pa}?$ How could these pressures be achieved for a gas with a volume of about $1\...
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Can slits in double slit experiment be substituted?

Can slits in double slit experiment be substituted with something material (rod, sphere, human hair...)? This of course implies lack of walls. It seems reasonable to me, as X-ray crystallography ...
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1answer
55 views

Can I measure light intensity using only .jpg pictures?

I have two pictures. On first one can see a lamp shining straight into my smartphone's objective and on the second picture one can see the same lamp but covered with a piece of paper. Can I use those ...
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1answer
40 views

Using a previously determined detective quantum efficiency for a detector

I am doing a radiation damage survey on a few different materials and will need the Detective Quantum Efficiency (DQE) when calculating the dose. I will be using the same detector for each sample and ...
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Would use of a funnel help speed up pumping off of gases from a low to medium vacuum?

Suppose you are trying to recover gases at a pressure of a thousandth or ten thousandth of a standard atmosphere inside a closed chamber. Might it be helpful to try to create a pressure gradient by ...
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1answer
176 views

Best/Most crafty ways to enhance spectrometer data from a mini-plasma generator?

I'm an undergraduate intern at a government lab specializing in plasma energy and fusion research. I've been assigned an interesting technical project that involves gathering spectrometer data (line ...
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What is the current limiting factor for GPS clock synchronization precision?

In the (slightly dated) paper 'Quantum Clock Synchronization Based on Shared Prior Entanglement' [R. Jozsa et al., Phys. Rev. Lett. 85, 2010 (2000)], the authors describe the GPS synchronization ...
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1answer
87 views

What is currently the approximate precision or accuracy $\delta r$ with which the position $r$ of an electron can be measured?

The measurement of the position of an electron has associated, on the one hand, a quantum uncertainty $\Delta r$ which gives an idea of the probability cloud where the electron can appear, for example ...
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80 views

How to characterise a UV lamp

I'm trying to characterise a deuterium lamp. It looks like a light bulb. Characterise in the sense of number of photons for wavelength (normalisation of the output spectral range). The energy zone ...
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1answer
53 views

Energy resolution data for organic scintillating detectors

I am interested in obtaining energy resolution data for organic gamma ray scintillation detectors. It is well known that radiation detectors tend to broaden the energy spectrum, which effects the ...
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1answer
22 views

Scintillator for adjusting sputter gun lenses

What do you use to adjust the beam of you sputter cannon? We have a test plate with a scintillating coating, that is now almost completely worn out, and I would like to replace it, but I am unable to ...
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1answer
221 views

Photomultiplier/ voltage divider troubleshooting

I have a Photonis XP5301 PMT to use for fast neutron detection (detector optically glued to the PMT window). I can't quite figure out why its not producing a spectrum. First of all, I have multiple ...
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1answer
153 views

Nonlinear Response of CCD camera

What is meant when it is said a CCD's response is nonlinear? Does it mean the value of a pixel of the camera is not proportional to the number of received photons? Does it involve saturation? What ...
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1answer
537 views

How is spectral energy density measured?

It has been my misconception that Plank's law for black body radiation is a function that relates intensity of cavity radiation to energy of radiation & temperature of the walls of the cavity. ...
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2answers
374 views

Is a micrometer a type of caliper?

Wikipedia says: A caliper is a device used to measure the distance between two opposite sides of an object. Therefor under this definition doesn't a micrometer also count as a caliper?
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51 views

How do you experimentally constrain momentum?

There's a famous experiment displaying Heisenberg's Uncertainty Principle https://www.youtube.com/watch?v=KT7xJ0tjB4A Where a beam of light is subject to increasingly narrow slit (constraining its ...
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181 views

Does the Box read Subconscious Mind? [closed]

I was watching this video from MindField channel on YouTube red, earlier also known as Vsauce on YouTube, which freaks me out when the Box tells you what button you are going to press, what was going ...
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1answer
555 views

Has Michelson-Morley been repeated using modern equipment?

Nowadays we have incredibly sensitive interferometers in the form of the LIGO detectors. I am curious to know if anyone has ever repeated the Michelson-Morley experiment in the last couple of decades ...
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33 views

What is the maximum inertial g-load of glass?

We are designing a lens system for an experiment that might be carried aboard a rocket. For the proof of concept study, we have to present design capable of withstanding 20 to 25 g loads( in lateral ...
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125 views

Observing particles without photons

Can particle physicists in a lab observe a particle, with electrons orbiting, in a vacuum without putting a photon on it (without inserting any electromagnetic energy so we don't disturb the position ...
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538 views

Identifying the Higgs boson at LHC

In quest of confirming Higgs boson's existence, particle collisions were observed at the Large Hadron Collider. Scientists had to distinguish the observation of the background noise/fluctuation and ...