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.

Filter by
Sorted by
Tagged with
0 votes
0 answers
31 views

Critique of a "warp drive" study (VEM drive) [closed]

The paper which talks about this concept is "The Artificial Inducement of a Local Space Warp Bubble Using a VEM Drive", but it requires payment to view, but most of the data in it is ...
user avatar
  • 323
2 votes
0 answers
56 views

In double-slit experiment with single atoms/molecules, how does the "gun" actually work?

In double-slit experiment with single atoms/molecules, how does the "gun" actually work? How are the atoms/molecules "launched" to the slits?
user avatar
  • 41
15 votes
2 answers
2k views

How is time measured in particle experiments?

I was reading about the half life measurements and was curious to understand the experimental setups that allows so minute measurements to be captured. Specifically looking into half life of Higgs ...
user avatar
-1 votes
3 answers
74 views

Experiments check out theories but who or what checks out the experiments? [closed]

There is a classic saying which goes more or less like this: If your theory is not verified by the experiment then it is wrong! Specifically for the field of particle physics, lately experiments ...
user avatar
  • 3,202
0 votes
1 answer
23 views

Physics of cathode ray electroscopes: How to take the nonuniformity of the electric field between the deflection plates into account?

If you do deflection experiments using a cathode ray tube from a high school or college physics lab (like this), one usually gets a notable discrepancy between theory and experiment, if one assumes in ...
user avatar
  • 1,603
0 votes
0 answers
17 views

Damage Equations for Projectiles with Small Velocities

I'm working on a personal project that happens to involve projectiles impacting an aluminum surfaces. The projectile velocities I am dealing with are relatively small compared with meteoroid ...
user avatar
  • 101
3 votes
1 answer
57 views

Adjusting the trip current on a Bertan Model 1755

The Bertan Model 1755 is a high-voltage power supply that was used in many experiments at SLAC. As far as I can tell, it was manufactured specifically and exclusively for experiments at SLAC. The ...
user avatar
  • 31
1 vote
2 answers
58 views

Are heavy or light nuclei used in the direct detection of dark matter?

My understanding is that recoils of light nuclei are easier to detect as they recoil with greater energy, however is the interaction cross section not much smaller, meaning interactions are much less ...
user avatar
2 votes
1 answer
79 views

What are the sealing adhesives for high vacuum system?

Recently, I have a project that needs to use a high vacuum system. During the construction process, I encountered a problem: I need to stick mica or glass to the window of the copper wall (one side is ...
user avatar
1 vote
0 answers
17 views

Deriving Wavelength from Relative Intensity with Broad Spectrum Light Sensor [closed]

I have this broad spectrum light sensor and it gives me readings in relative intensity, but says that it's able to measure the wavelength. The documentation is rather unhelpful, so I was wondering how ...
user avatar
3 votes
1 answer
391 views

How do you stabilize the temperatures in your sensitive laboratory experiments?

I work in an AMO Lab, and I have been tasked with creating an experiment enclosure that will keep the air (and instruments) stable within about 50 mili-Kelvin with a set point of about 20C-21C. Our ...
user avatar
  • 31
-1 votes
2 answers
58 views

What contaminant materials should be avoided for reaching ultra-high vacuum? [closed]

This question relates to ultra-high vacuum chambers (order of ~$10^{-10}$ mbar) in experimental setups. For this particular vacuum chamber, we have a set of ion pumps and a turbomolecular pump (...
user avatar
2 votes
1 answer
39 views

Which one is more precise: Phase locked loop or log the waveform then do sliding FFT?

I have an experimental confusion. I am using an interferometer to monitor the movement of a translation stage by monitoring the intensity of the coaxis interference pattern of the He-Ne laser. ...
user avatar
3 votes
1 answer
111 views

Comparison of beam divergence between laser diode and DPSS lasers

I'm currently comparing a pulsed laser diode and a pulsed DPSS laser. For the DPSS laser, the beam divergence is listed as "beam divergence (80% of total energy): $<4 \text{mr}$". The ...
user avatar
1 vote
0 answers
29 views

Realization of uniform volume charge density

A sphere with uniform volume charge density is often considered as an example in E&M. Is this a useful fiction for testing students or are there any techniques to induce a uniform volume charge ...
user avatar
2 votes
1 answer
54 views

Creating a map of energy from gravitation measurements

There are some devices which used supercooled falling atoms to measure gravity in order to weakly find large regions of different density. Would it be possible with current technology to measure ...
user avatar
  • 192
2 votes
1 answer
68 views

Is it necessary to use a collimated light beam when using a polarizer?

I am using two polarizers (one for an halogen light source and one for a camera) to measure light reflected in parallel and perpendicular polarization setups. Should the light source used along with ...
user avatar
  • 123
0 votes
0 answers
25 views

Practical to measure topography of a large area (mm-scale) with scanning probe microscopy (SPM)?

I'm currently very new to nanotechnology. I do understand that it is possible to achieve an excellent topography image of a sample by SPM. However, is it possible to do SPM over a large area (for ...
user avatar
0 votes
1 answer
363 views

Experiment to determine the center of mass

Consider an axially symmetric rigid body with asymmetric mass distribution. Generally, the center of mass (and therefore moments of inertia) can be determined by knowing the center of mass of the ...
user avatar
  • 2,324
1 vote
0 answers
171 views

How does loggerpro generate its uncertainty in position and time when conducting motion analysis at a given FPS and scale (e.g. metre ruler)?

I am conducting a physics experiment where I am trying to find the terminal velocity of a falling coffee filter by recording the drop on my phone at 4K 60 FPS and using the video to create a position ...
user avatar
11 votes
1 answer
253 views

How do non-mechanical solid-state optical switches work?

I am currently looking for a fiber-optical switch (FOS) in order to be able to change the light source of a spectrometer. As this will be used in harsh conditions, I was hoping to find a FOS with no ...
user avatar
1 vote
1 answer
82 views

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) ...
user avatar
2 votes
1 answer
120 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 ...
user avatar
8 votes
2 answers
525 views

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 ...
user avatar
  • 1,170
3 votes
3 answers
319 views

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 ...
user avatar
3 votes
1 answer
97 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 ...
user avatar
1 vote
0 answers
39 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 ...
user avatar
  • 311
3 votes
1 answer
786 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 ...
user avatar
5 votes
1 answer
142 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 ...
user avatar
0 votes
0 answers
67 views

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 ...
user avatar
0 votes
2 answers
131 views

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.
user avatar
  • 103
1 vote
0 answers
56 views

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 ...
user avatar
3 votes
0 answers
593 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 ...
user avatar
1 vote
0 answers
258 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 ...
user avatar
  • 263
0 votes
1 answer
45 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 ...
user avatar
  • 257
4 votes
1 answer
131 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 ...
user avatar
1 vote
1 answer
86 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 ...
user avatar
3 votes
2 answers
162 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-...
user avatar
1 vote
2 answers
347 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 ...
user avatar
0 votes
0 answers
29 views

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% ...
user avatar
1 vote
1 answer
143 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 ...
user avatar
  • 4,095
2 votes
1 answer
47 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 ...
user avatar
  • 315
1 vote
0 answers
27 views

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 ...
user avatar
0 votes
1 answer
44 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 ...
user avatar
0 votes
1 answer
1k 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 ...
user avatar
-1 votes
3 answers
221 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 ...
user avatar
2 votes
0 answers
98 views

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 ...
user avatar
  • 1,360
1 vote
1 answer
183 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 ...
user avatar
  • 11
11 votes
1 answer
267 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 $...
user avatar
1 vote
0 answers
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\...
user avatar
  • 5,826