28 Feb '14, 12pm

New post: Homebrew Phase Laser Rangefinder

New post: Homebrew Phase Laser Rangefinder

Just when you thought ARM micros couldn’t get any cooler, another project comes along to blow you away. [Ilia] created a phase laser rangefinder (.ru, Google translatitron ) using nothing but a laser diode, a pair of magnifying glasses, a few components and an STM32F4 Discovery dev board. The theory behind this build is using a laser’s phase to determine how far away an object is. By modulating the laser diode’s output at a few hundred Mhz, the reflection from the laser can be compared, giving a fairly reasonable estimate of how far away the target is. This method has a few drawbacks; once the reflection is more than 360 degrees out of phase, the distance ‘loops around’ to being right in front of the detector. The laser diode used does not have any modulation, of course, but by using an STM32F4 ARM chip, [Ilia]was able to modulate the amplitude of the laser with the help o...

Full article: http://hackaday.com/2014/02/28/homebrew-phase-laser-range...

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