All Questions
Tagged with signal-processing spectroscopy
11
questions
0
votes
1
answer
123
views
The solar spectrum on the time domain
This is the solar spectrum by wavelength:
By formula $c=f\lambda$, we can plot the solar spectrum over the frequency domain:
Then we can conduct inverse Fourier transform to transform the plot into ...
- 9
0
votes
2
answers
4k
views
How do I convert the Amplitude from Power/Amplitude spectral density?
I've started working on PSD for seismic signals. In theory, PSD signal can be expressed in 2 ways. One in $(PSD=g^2/Hz)$ and other in $PSD=((meter/second^2)^2/Hz)$ and also ASD=(√PSD). Here $g$ is the ...
- 11
5
votes
2
answers
953
views
What, mathematically, is the power spectrum of a signal?
Given a signal $f(t)$ defined on $t\in(-\infty,\infty),$ what is the precise definition of the power spectrum of $f$, i.e., what is the mathematical operation that takes $f$ to the output of an ideal ...
- 3,407
0
votes
1
answer
35
views
Terminology: "3σ detection over the continuum"
I am reading a research paper and they use the expression:
"This is a weak signal, i.e. 3-4σ detection over the continuum".
I saw this sentence in a lot of papers, but I can not find what ...
- 447
1
vote
0
answers
492
views
Photo Multiplier Tube (PMT) and charge sensitive pre-amplifier
I have an H7195 assembly type Photo Multiplier Tube (PMT) used to be tested for single photon measurement. I would like to use the dynode output to check the spectrum by connecting to a charge ...
- 11
1
vote
0
answers
63
views
Fourier Coefficients
Suppose i've a two voice samples v1 and v2. Comparatively voice v1 is louder than the v2. If both the voice is spoken by the same person.(Spoken normally as he speaks)
Is it good to state the ...
- 121
1
vote
1
answer
123
views
How do scintillation detectors work, for gamma ray spectroscopy
So I understand what happens in the crystal with respect to the interactions and how the electrons in PMT are multiplied by hitting dynodes etc. But what I can't really seem to find any information on ...
- 579
0
votes
1
answer
145
views
Noise reduction approaches in optical spectral measurement
I am using an optical spectrometer to measure some surfaces in the visible, and since the signal is quite noisy I wondering what would be the best way to reduce the noise.
In particular, are there ...
- 27
0
votes
0
answers
55
views
Deconvoluting Raman spectras from different wavelengths
I am using a laser source that is wider than typical laser source for Raman spectroscopy. This mean that the full width at half maximum (FWHM) of the laser is about 5-10 nm, compared to the normal 1-3 ...
- 31
1
vote
0
answers
89
views
Can anybody explain about phase shift and phase spectrum terms in case of multidimensional signal?
I know about phase of a 1D signal, but when I move into higher dimensions like 2D or 3D etc, it becomes headache to grasp the concept.
What do the terms "phase shift" and "phase spectrum" mean in ...
- 221
1
vote
0
answers
40
views
Spatial Resolution in Magnetocardiography
In the science paper called Development of an optical cardio-magnetometer by George Bison, it is mentioned that spatial resolution of 10-20mm is required for mapping MCG signal(page 52). What does the ...
- 51