17,275 reputation
12455
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location Vancouver, Canada
age 45
visits member for 4 years, 5 months
seen 5 hours ago

VP Research&Development at an image guided surgery startup.

Mostly do C++,python,image processing,machine vision - anything with lots of 3D,maths and data. Background is experimental physics and optics.


4h
comment Using a laser to overhear a room conversation
Would you need to measure the speed of the window or merely the position wrt to time. I'm not sure I would use doppler as much as simply an interferometer (ie a phase distance measurement)
1d
awarded  visible-light
Aug
14
revised Can a GPS system detect the decline in the rotational velocity of the Earth?
added 107 characters in body
Aug
12
answered Colour changing material/ink
Aug
11
answered Can a GPS system detect the decline in the rotational velocity of the Earth?
Aug
9
answered thin film interference of light
Aug
9
awarded  thermodynamics
Aug
8
answered Is heat conduction impeded at interfaces between dissimilar materials?
Aug
8
comment If planet orbits are in the shape of an ellipse and the sun is a focus, where and what is the focus?
IIRC the mass of Jupiter means the Sun-Jupiter barycenter is just above the surface of the sun
Jul
26
comment Can we extract positrons from gamma rays?
yes, the problem is more likely to be getting a strong enough source of gamma rays
Jul
25
comment How power lines use high voltages with a low current?
@RJSmith92 the V in the question is the voltage difference along the cable = "wasted" voltage. By having a high voltage/low current cable then with a given R you have a low V difference = low wasted power.
Jul
19
comment Do all stars Turn into Black Holes?
physics.stackexchange.com/questions/99375/…
Jul
18
answered Image formation or Diffraction?
Jul
18
comment How easily can the Earth flip?
@punkerplunk the rotation kinetic energy of the Earth is around 10^29J that's a lot of energy - leaving aside the lack of a mechanism for transferring it.
Jun
21
answered Having trouble understanding spectral lines
Jun
19
awarded  Good Answer
Jun
9
answered Do transformers lose energy?
Jun
8
answered Ice/Melting Bullet
Jun
4
comment Why can't LIDAR be implemented with traditional antennae?
Yes that's true, with enough power and a poorly matched impedance you could make the antennae emit visible light - fairly briefly
Jun
4
answered Why can't LIDAR be implemented with traditional antennae?