Patent
Pulse coded sound reproduction using optical read-out of the microphone membrane
TLDR
In this paper, the vibrations of a membrane are read out by means of a pulsed light beam incident on a photoelectric sensor, and an integrated sensor amplifier structure is used.Abstract:
The vibrations of a membrane are read out by means of a pulsed light beam incident on a photoelectric sensor. Integrated sensor amplifier structures are used.read more
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Patent
Small optical microphone/sensor
TL;DR: In this paper, a smart optical microphone/sensor for sensing distances to a membrane or to a light-reflecting surface is presented, including a source of light for illuminating the membrane or light reflecting surface; a photodetector for receiving light reflected from the membrane and a pre-amplifier for amplifying the output signals, whereby the sensitivity of the microphone or sensor can be adjusted.
Patent
Planar reflective optical devices
Alan Huang,Jurgen Jahns +1 more
TL;DR: In this paper, alignment difficulties in optical computing arrangements are overcome by integrating the optical components on a single substrate and arranging the elements in a manner that causes them to interact with one another to perform the desired function.
Patent
Method and apparatus for measuring gas concentrations
Daniel W. Youngner,Lisa M. Lust +1 more
TL;DR: In this article, the phase of the reflected light is dependent upon the distance of the pressure-sensitive membrane from an aperture of the semiconducting laser. But the phase is not dependent on the position of the membrane.
Patent
Digital movement measuring device
TL;DR: In this paper, an optical member intercepts the light beam and is connected to the mobile element such as to follow the movement thereof, pixel sensors that capture the emitted beam determined by the position of the optical element in relation to the light source, and a comparator module that compares the values originating from the pixels of the sensors with two different thresholds such as assigning a logical value to some of said values.
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Patent
Coaxial optical system for displacement gauges
John H Long,Lupish Walter +1 more
TL;DR: In this article, an improved optical displacement gauge was proposed for measuring changes in light intensity, based on the principle that light intensity varies with distance and employing photoelectric means to measure changes in the light intensity.