# doppler-effect's questions - English 1answer

294 doppler-effect questions.

### How does a laser Doppler vibrometer work?

1 answers, 18 views waves doppler-effect
I know almost nothing about optics or lasers, but I understand mathematics. I'm trying to understand the basic principle behind a laser Doppler vibrometer, but I don't really get it. The main thing I ...

### What is the meaning of the formula $f_D = \frac{2v}\lambda$ in the context of the Doppler effect?

0 answers, 20 views waves doppler-effect

### 2 Why does heterodyne laser Doppler vibrometry require a modulating frequency shift?

3 answers, 596 views optics laser doppler-effect interferometry
On the wikipedia article (and other texts such as Optical Inspections of Microsystems) for laser Doppler vibrometry, it states that a modulating frequency must be added such that the detector can ...

### Laser / doppler cooling setup

0 answers, 23 views laser doppler-effect cooling
Would it be practical to use doppler / laser cooling to cool a small surface (metal conductor) of 10 x 10 cm from 30 C to 20 C? Let's say using a setup like below? Where can I learn more about the ...

### 2 Pound-Rebka-Snider experiment in the inertial frame

In Schutz's book (page 120), Schutz first derives the gravitational redshift in the PRS experiment in a previous paragraph. $\frac{\nu^{\prime}}{\nu}=\frac{m}{m+mgh+O(v^4)}=1-gh+O(v^4)$. Here \$\nu^...