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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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0answers
171 views

Building the Penrose Unilluminable Room [closed]

As an architect with an interest in the natural sciences I was intrigued when I first learned of the illumination problem and its proposed solutions, specifically the one proposed by Roger Penrose in ...
1
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1answer
35 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 ...
2
votes
1answer
30 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 ...
2
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0answers
56 views

In what ways can gravitational wave research help particle physicists? [closed]

Old content (put on hold as too broad) I was massively ill-informed about the experiments that shape the modern particle physics research. For example, I believed that most of the information that ...
0
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0answers
19 views

Should I use a barometric pressure sensor (BME280) or a differential pressure sensor (MPXV7002DP) to measure the airflow and pressure in an open tube?

I'll elaborate more on my set-up. I have a an acrylic tube and inside the tube is a ball one side has a dC fan to output air and the other side is a small cover just to not let the ball escape from ...
1
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0answers
21 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 ...
0
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1answer
33 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 ...
0
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1answer
96 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 ...
-1
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3answers
102 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 ...
2
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0answers
87 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 ...
1
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1answer
61 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 ...
7
votes
1answer
86 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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0answers
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\...
0
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0answers
17 views

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 ...
1
vote
1answer
41 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 ...
1
vote
1answer
29 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 ...
1
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0answers
14 views

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 ...
2
votes
1answer
73 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 ...
2
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0answers
35 views

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 ...
0
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1answer
73 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 ...
1
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0answers
68 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 ...
0
votes
1answer
44 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 ...
0
votes
1answer
19 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 ...
2
votes
1answer
167 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 ...
0
votes
1answer
110 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 ...
0
votes
1answer
395 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. ...
0
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2answers
248 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?
0
votes
1answer
47 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 ...
-3
votes
1answer
110 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 ...
3
votes
1answer
437 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 ...
0
votes
1answer
31 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 ...
1
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0answers
104 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 ...
3
votes
2answers
449 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 ...
4
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0answers
190 views

How can I test whether my cloud chamber is supersaturated or not?

Me and my friend are building a diffusion cloud chamber for a school project. In stead of using dry ice or a peltier, we have used the phase changer of a freezer to cool our plate. We were able to ...
1
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2answers
157 views

How to properly work with water-immersion microscope lenses

I've recently got Olympus water immersion lens (no cover glass), and I really like it, but it seems it requires completely different approach to work. On conventional lenses - you put specimen on a ...
1
vote
1answer
182 views

Geiger Counter Electronics Dead Time

In essence, I am working with an old (1960s) Geiger-Muller tube and a set of counting electronics, including an amplifier. Unfortunately, I don't have access to them for the next month or so, due to ...
0
votes
1answer
55 views

What generates the current that then is made to flow in superconductors at CERN?

At CERN for example, what is actually providing the current? It cannot be a battery because when the load resistance is less that the internal resistance then the load sees no voltage... So do they ...
1
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1answer
131 views

What is the electron energy scale calibration?

I am reading a paper from ATLAS collaboration in CERN and it is mentioned the "electron energy scale calibration" many times. It must be related to energy calibration in the experiment but I would ...
1
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1answer
177 views

How far are we from reaching around $10^{16}~\rm GeV$ collisions experimentally?

I understand this is a highly speculative question, so I'm not expecting final words, but rather insights to deepen my notion on the issue. I know we reached about 209GeV at LEP in the end of 2000, ...
1
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1answer
97 views

How much helium will there eventualy be in the insulating vacuum space of a helium dewar

If we were to start with a good vacuum in a dewar that was used to hold helium and the helium diffused in slowly and out to the atmosphere from the outer container wall. What would the equilibrium '...
4
votes
2answers
490 views

Pound-Drever-Hall frequency stabilisation technique

I am having some difficulty understanding the Pound-Drever-Hall frequency stabilisation technique, when locking a laser to a stable cavity. As far as I understand: We emit the laser frequency, f0. ...
2
votes
2answers
174 views

Muon lifetime determination

My colleagues and I performed several experiments to determine the lifetime of the muon (from secondary cosmic rays) using scintillator detectors coupled to multi-channel analysers. The results ...
0
votes
2answers
480 views

What does J cm-1 stand?

For an optical component, I got following number as an optical damage threshold from the company, damage threshold = 10 Jcm-1,20ns, 20Hz It looks like 20ns is ...
1
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1answer
69 views

Is it possible to measure the spin of an electron without moving it?

I know that the position and spin operators commute, so it is theoretically possible. What I want to know is, what experiments currently exist that achieve this?
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0answers
67 views

How do modern particle detectors identify and segregate different particles

What is the specific particle detector technology used at CERN or similar Institutions. Is it essentially a big digital camera? When said particles are detected, how are they segregated, How does this ...
4
votes
2answers
106 views

What is crater's influence on laser ablation?

In many laser ablation experiments (especially Pulsed Laser Deposition), target is moving to avoid crater formation. But I can't find any source that says why it is needed to avoid it. So why is ...
3
votes
1answer
80 views

Machine readable database of gamma lines

Friends of mine did a lab experiment where they recorded $\gamma$-spectra in the range from 0 to 1500 keV with a soil sample. The data contains some background and a couple sharp peaks at different ...
2
votes
1answer
64 views

How deep within the sample can the DOS(density of states) be detected by STM(scanning tunnel microscope)?

Using STM equipment, we can get the LDOS(local density of states) on the surface of a sample. I want to know whether the LDOS within the sample(not surface) can be detected by STM. what is the ...
0
votes
1answer
4k views

How quickly does a small piece of molten steel cool at room temperatures?

Say I have a $(\frac{1}{2}D)^2 \pi \times \ell = (.05)^2 \pi \times .03 \approx 0.000236 \ \text{mm}^3$ piece of molten steel freshly spewed out of a hot nozzle. Now assuming the nozzle moves away ...
0
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1answer
97 views

How did Cavendish measure the deviation of light from the Sun?

On today's date in 1731 was born Henry Cavendish. He is mainly know for his Chemistry research, however, while I was reading his biography I've noticed that he also calculated the bending of light due ...