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[Phys-l] Physicists' unintended use of domestic apparatus.



Modification of DVD to an accelerometer:


"The sensitivities of the accelerometer in the
X- and Y-axis directions are 22.9 V/g and 21.3 V/g, respectively. Finally,
the noise equivalent acceleration (NEA) of the accelerometer is found to be
less than 30 μg Hz−1/2 over the frequency range 0.5–50 Hz."


"... presents a schematic illustration of the two dimensional
angle sensor developed in this study. As
shown, the DVD pick-up head (Sony KHM-210AAA, 650 nm
wavelength [15]) is modified by removing the diffraction
grating, the objective lens and the VCM, and then adding
a plane mirror. The original four-quadrant photodiode is
retained as a light intensity detector. The stability of the laser
output power is ensured by using a specially designed power
supply integrated with an automatic power control (APC)
feedback circuit (not shown). ..."


Meas. Sci. Technol. 18 (2007) 265–274


bc finds the oddest things when searching.

p.s. not so recently an AJP article described the used of a watch tuning fork as a micro positioner or forceometer, IIRC.