Questions tagged [instrument]

A measurement instrument is a device used to sample physical observations. Examples include pressure sensors, thermocouples, etc.

Filter by
Sorted by
Tagged with
6 votes
3 answers
2k views

What is meant by precision of a measuring instrument?

I came across many definitions of the precision of a measuring instrument such as, "a precise measuring tool is one that can measure values in very small increments" and "The precision ...
Altair25's user avatar
  • 103
1 vote
0 answers
39 views

Why to use the Callendar equation instead of the temperature coefficient differential equation?

The temperature coefficient differential law gives an equation for the temperature coefficient $\alpha$, which describes the relative change of a physical property $R$ that is associated with a given ...
user386164's user avatar
0 votes
0 answers
61 views

What is heard when a tuning fork is struck?

When a tuning fork is struck I hear two tones. From a distance I can hear a high octave frequency of the pitch of the tuning fork. Though, if I listen to it closely (closer to my ears), I also hear a ...
Lecifer's user avatar
  • 109
1 vote
1 answer
48 views

Is the lens image, a combination of diffraction patterns?

As I was reading through Luigi Picasso's Lectures in QM, I came across this paragraph where he explains the reason behind the resolution power of the optical instruments. He writes: Let us now ...
Rice Field's user avatar
0 votes
0 answers
59 views

Measurement paradox

When building electronics to measure usually it is asked what the bandwidth of the signal is and what is the frequency range usually done to limit noise bandwidth and thus have more SNR. To me it ...
Weijie Chen's user avatar
0 votes
1 answer
36 views

How should I esteem the measurement error using an instrument with high precision and low accuracy?

I was performing an experiment about the Beer–Lambert law using a luxmeter I bought online. In the user manual it's stated it has "$Accuracy: \pm\,3\%\,reading\pm\,8\,digits$". During the ...
Phys's user avatar
  • 57
1 vote
0 answers
23 views

Why is the bias instability read from my Allan Deviation plot different than my simulation input? [closed]

I have simulated a gyroscope at rest with angular random walk and bias instability, following the mathworks IMU simulation model found here. In conjunction with that simulation model, I am plotting ...
rocksNwaves's user avatar
0 votes
0 answers
20 views

Why the tapered optical fiber which dipcoated with rGO didnt give significant changes of voltage inside Photodetector?

I already cut it carefully the jacket out from cladding, and then use ethanol to rub the cladding so the core can be dipcoated with PVA-rGO solution. Now I can see higher voltage depends of how much ...
Becker Hija's user avatar
3 votes
0 answers
51 views

What is the meaning of "Dual Accuracy" on this datasheet?

I'm trying to determine the uncertainty in some of my measurements, and one of the variables I measure is temperature, using a Tenma 72-7715 thermometer. I looked up the datasheet to find the ...
probablysid's user avatar
1 vote
2 answers
69 views

The sun's neutrinos and the brain [closed]

Is it possible for the sun's neutrinos to be detectable biologicaly . Or what is the simplest way for a experimenter to detect neutrinos externally?
Levimega's user avatar
0 votes
1 answer
453 views

Difference between BATT and Voltage on multimeter

My digital multimeter (the one in the picture) has a function called "BATT", which, according to the manual, is used to read the voltage of batteries. I noticed that it gives different ...
Rhino's user avatar
  • 683
7 votes
3 answers
785 views

What physical state of a wound string corresponds to a 'tuned' string?

Many instruments can be strung with strings comprised of a solid core and wound with another metal wire, e.g. the viola. I was wondering about the physical state of wound strings when they are 'in ...
Sierra Horangic's user avatar
0 votes
1 answer
67 views

Instrument limitations and capabilities [closed]

What do we mean by instrument? Explain the limitation and capability of an instrument.
Oyetunde Dotun's user avatar
0 votes
2 answers
2k views

How is the formula $R=l^2/6h+h/2$ for calculation radius of curvature of a spherical surface is derived? [closed]

The problem with the derivation is that in one figure the point M is taken the bisector of AB while in the second one it is completely out of the line AB. So for AM.MB=OM.MZ to be true the chords AB ...
Timmy's user avatar
  • 21
1 vote
1 answer
240 views

Why doesn't the thermometer go back to ambient temperature after I take my temperature?

These past days I had a fever and I have taken my temperature many times with the thermometer in the photo. I think this is just like a mercury thermometer, even if it's a newer one that does not ...
Rhino's user avatar
  • 683
0 votes
1 answer
168 views

What is the difference between MOKE hysteresis loop and VSM Hysteresis loop?

I need to understand what is the difference between Magneto-optical Kerr effect (MOKE) hysteresis loop and vibrating sample magnetometer (VSM) hysteresis loop? And the use of each one of them?
Markoul11's user avatar
  • 3,841
0 votes
1 answer
33 views

Pumping laser for Ti:Sapphire laser

I now own Tsunami Ti: Sapphire laser from Spectra-Physics. This laser is an ultrafast laser. Now, this is pumped by Millenia CW green laser. Apart from the output coupler problem, I am considering ...
user15181's user avatar
-2 votes
2 answers
53 views

Measuring temperature at submicron resolution

Do we have any microscopic technique/protocol to measure temperature at sub-micron resolution?
Piyush Nanda's user avatar
0 votes
0 answers
51 views

Numerical Problems Based On Vernier Callipers [duplicate]

I watched a video on Vernier Calipers which gave me an understanding of how it works and how to read a Vernier Caliper. I also tried the GeoGebra simulation. But I am not able to understand the ...
user avatar
0 votes
2 answers
436 views

Changes to a thermometer that would require the spacing of the division to be larger

A mercury-in-glass thermometer having a larger bulb, a narrower capillary tube and more liquid will need to have a larger space between the divisions for an accurate reading compared to other ...
Shane's user avatar
  • 425
4 votes
3 answers
614 views

What is the difference between a photon's phase and polarization?

When talking about a photon emitted by a laser device, what is the difference between phase and polarization? Is it redundant to specify both the polarization and the wavefunction's phase? Does a ...
João Bravo's user avatar
0 votes
1 answer
101 views

How to measure wind speed non-accoustically without moving parts? [closed]

I heard that there are ways to measure wind speed independent of the direction other than the usual anemometer or acoustic Doppler profilers, with a setup without any moving parts. Could somebody ...
B--rian's user avatar
  • 115
0 votes
1 answer
43 views

What is the name for the instrument to measure radiation consisting mainly out of a glass ball?

I remember vaguely a measurement instrument to protocol probably solar irradiance. The instrument mainly consisted out of a glass sphere and if I recall correctly, the sun was "writing" ...
B--rian's user avatar
  • 115
-2 votes
1 answer
48 views

Is it possible to visualize water vapour with a low-cost instrument or setup in a lab? [closed]

Would infrared or laser be of any help? In a lab setting.
Paul Wareham's user avatar
1 vote
3 answers
649 views

Zero Error of Screw Gauge

Consider a screw gauge of 50 divisions on the circular scale. Till now I have used the following method to account for zero error in it. If $x^{th}$ division on the circular scale coincides with the ...
Tony Stark's user avatar
  • 1,528
0 votes
1 answer
242 views

Is there an instrument which can show the magnetic field in a region?

I know that an instrument called magnetometer exists. But it can only measure the magnetic field at a given point. I wonder if there exist, or is it possible to build a device which would be able to ...
Alpha Delta's user avatar
  • 1,012
0 votes
3 answers
292 views

What is the smallest acceleration ever measured? [closed]

I'm having an argument (discussion) with a referee. I claim that the effects of expansion can be seen in local dynamics. That the orbit of Saturn is affected infinitesimally by the expansion of ...
Quark Soup's user avatar
0 votes
0 answers
27 views

How is it possible to do spectral analysis of a light source?

I have a big book published many years ago by NASA which is page after page of numbers, the numbers being the irradiance of the sun at particular wavelengths. I wonder how such a book could be ...
Ambrose Swasey's user avatar
1 vote
1 answer
44 views

Is it possible to consider the oscilloscope as an essential instrument?

I recognize that the oscilloscope is a very useful instrument. But I would like to know what are the reasons why the oscilloscope is such a useful instrument in day-to-day scientific work. I would ...
AlmaH's user avatar
  • 33
0 votes
0 answers
197 views

How does a Bourdon tube maintain constant volume?

I would like to understand why a Bourdon tube works, the working principle is described on wikipedia as: The Bourdon pressure gauge uses the principle that a flattened tube tends to straighten or ...
Kuhlambo's user avatar
  • 890
2 votes
2 answers
1k views

What will happen if we try to take a voltage reading by keeping it in current mode in a multimeter?

There are different modes present in a multimeter. one is the current mode and voltage mode for their respective measurements. what will happen if one try to take a voltage reading by keeping it in ...
user avatar
0 votes
1 answer
154 views

When does the sensitivity of tangent galvanometer approaches a max value?

The image shows the approach of a few saying that the sensitivity is maximum if the deflection approaches zero. The white portion is a snap of a reference book which says the sensitivity is maximum if ...
Gautam Hams's user avatar
0 votes
0 answers
49 views

Identifying Physics Equipment

We are clearing out some old cupboards at school in our science department and have come across three different sets of physics equipment with no labels or instructions. Please could people kindly ...
user37250's user avatar
  • 555
0 votes
0 answers
13 views

Is there an instrument that measures temperature (dynamic reading) at high irradiation doses?

I would like to measure the temperature in industrial gamma irradiation bunker. I know thermocouples are often used, but they only give max temperature reading, and I would like to have a dynamic ...
AnaM's user avatar
  • 1
1 vote
1 answer
226 views

Accurate method or instrument to measure density of shaving cream foam or whipped cream foam?

I am currently filling a "standard" stainless steel cup of known volume with foam and then I weigh it. Then I calculate density. This method is pretty messy and I have to be careful about how I fill ...
agentboo's user avatar
1 vote
2 answers
332 views

How can the apex angle of a Fresnel biprism be equal to $180^\circ$?

I am learning about Fresnel biprism. I wanted to know about biprism, and found out on the internet that it is a triangular prism with apex angle $180^\circ$. But I am unable to interpret $180^\circ$. ...
peaceHoper's user avatar
1 vote
1 answer
646 views

Why do hot-wire instruments have a non-linear scale?

Hot-wire instruments are used to measure rms voltage or rms current in AC circuits. The construction of a hot-wire instrument is shown in the following diagram: Image source: Hitzdrahtmesswerk (Hot ...
Vishnu's user avatar
  • 5,256
1 vote
1 answer
56 views

How does ultrasound imaging localize points in the $x$-$y$ plane?

Lots of sources describe how ultrasound imaging uses the time differences between wave emission and reception to calculate distances to points in the body. This makes sense for how localization works ...
WillG's user avatar
  • 3,303
0 votes
0 answers
80 views

Probability that the Hubble space telescope hit by Meteoroids

What if Hubble Space Telescope or International Space State hit by micrometeoroid or meteoroid? Asking because these objects are moving at a very high velocity.
user-2147482075's user avatar
0 votes
1 answer
39 views

How to decide the arrangement of an individual telescope in an astronomical interferometer?

Let's take the example of GMRT radio telescope, where individual telescopes are arranged in Y pattern. Please explain in detail.
user-2147482075's user avatar
1 vote
0 answers
31 views

How the diffraction occurs in cassegrain telescope?

I know about the diffraction limit of a telescope. But please explain through diagram how diffraction occurs in Cassegrain telescope which has both primary as well as a secondary reflector.
user-2147482075's user avatar
4 votes
0 answers
151 views

Why bulk of HPGe detectors is doped?

When I am looking at schematic diagrams of HPGe gamma spectrometer detectors (like this Ortec GLP one), it is often mentioned that bulk of Ge is doped. In this example - P-type doped. Is there a ...
BarsMonster's user avatar
  • 2,371
2 votes
1 answer
43 views

Does a pipe hit at the top behave like an open-open system or an open-closed system?

I'm making an instrument from an open-ended tube that produces sound when the top (opening) is struck. To find the lengths corresponding to pitches, I used $$ V = \lambda f \tag{1} \label{1} $$ and ...
Aidin Decker's user avatar
0 votes
1 answer
173 views

What is spectral redshift resolution of observationally detected damped Lyman Alpha clouds?

What is the spectral resolution, $\Delta z,$ when detecting damped Lyman alpha systems at different epochs, $z \sim 0-3,$ through current and/or future observational instruments? And is this redshift ...
Rebel's user avatar
  • 115
2 votes
1 answer
1k views

Why is Fresnel Biprism a "Bi-" prism?

Why is the Fresnel Biprism made of two separate prisms joined together at their bases? Why not use a monoprism, a single prism having the same overall geometric and optical properties as that of the ...
Vishnu's user avatar
  • 5,256
1 vote
1 answer
110 views

Why is there no standardization of indentation hardness measurements? [closed]

The last hundred years have seen a great degree of standardization of units, and the expression of units of measurement in standardized, instrument-agnostic, objective terms. So I wonder why this ...
ikrase's user avatar
  • 337
1 vote
0 answers
45 views

Blackbody radiation source

I have an instrument in the lab which needs to be calibrated. Ideally, it needs to be calibrated using a device that produces near-perfect blackbodies called a "blackbody calibration source". An ...
user4437416's user avatar
3 votes
1 answer
110 views

How to know that scientific instruments work?

While reading Zimring's book, What Science Is and How It Really Works, I came across some words on being skeptical about scientific instruments on p.183-184: "The extent to which such instruments ...
Favst's user avatar
  • 133
0 votes
1 answer
282 views

Measuring small changes in length using the micrometer screw gauge

Which of the following method/instrument cannot be used to measure small changes of the order of a millimeter occurring in a length of about 50cm. 1)spherometer 2)travelling microscope 3)meter ...
AfiJaabb's user avatar
  • 308
0 votes
0 answers
48 views

Measuring signal shorter than instrument response function

If one has a well-defined instrument response function (IRF) of some known full-width half maximum (FWHM), and they are measuring a signal that is shorter (but the shape is known), is it possible to ...
Kam's user avatar
  • 121