Optical Technologies, Inc.

Other

Charles M Davis

Clarence J Zarobila

Robert E Einzig

James B Freal

A single mode optical fiber is used to detect electrical currents or magnetic fields from a source to a high degree of accuracy. Phase modulation of an optical beam is used to determine the changes of physical properties of a magnetostrictive material which jackets the fiber or around which the fiber is wound. An electromagnetic field, such as that emanating from a high intensity field wire, is measured by the device which acts as a current transformer and meters peak-to-peak electric currents of approximately 10,000 amperes or more with accuracy exceeding 0.1%. The invention structure of the device provides advantages such as operation safety, EMI immune leads, low cost, light weight, and dielectric construction among others.

Fiber optic

A single fiber optic optical sensor in one segment of a divided interferometer and a remote demodulation interferometer segment associated therewith.

Fiber optic interferometric thermometer

A highly sensitive microbend horizontal fiber-optic accelerometer has been conceived, particularly useful in seismological research where minute accelerations must be detected. The device uses a cantilever beam and the compliance of an optical fiber mounted between deforming teeth to act as the springs in the accelerometer's spring-mass system. Acceleration is detected by sensing the changes in the intensity of light propagating through the deformed fiber due to the motion of the mass relative to the case. Accelerations as small as 5 .mu.g at 1 Hz can be detected with a dynamic range of 100 dB.

Optical fiber microbend horizontal accelerometer

A single fiber optical fiber temperature measuring device is provided for in vivo determination of temperature at a plurality of spaced points. The device includes a fiber optical temperature sensing device having at least first and second optical fiber sensors which optical fiber sensors are positioned at the measurement sites and at least two fiber optical sensors are connected to a divided interferometer associated with an opto-electronic demodulator which has an output signal representing the temperature at the sensed sites. The device also has utility in industrial or chemical temperature sensing applications.

Growing community of inventors

Herndon, VA, United States of America

Charles M Davis