US PATENT SUBCLASS 250 / 227.19
.~.~.~.~ With coherent interferrometric light

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
216  DF  .~ Optical or pre-photocell system {11}
227.11  DF  .~.~ Light conductor {14}
227.14  DF  .~.~.~ Condition responsive light guide (e.g., light guide is physically affected by parameter sensed which results in light conveyed to the photocell) {5}
227.19.~.~.~.~ With coherent interferrometric light

DEFINITION

Classification: 250/227.19

With coherent interferrometric light:

(under subclass 227.14) Subject matter wherein the light waves transmitted by the light conductor are coherent, i.e., the phases of the waves are substantially in step spatially and temporally, and the condition sensed by the light conductor affects the coherent light so that an interferometric pattern is presented to the photocell.

(1) Note. This definition is inclusive and includes, for example, arrangements where noninterferometric light is presented to a photocell along with an interferometric pattern to a photocell.

(2) Note. This type of device ordinarily includes fiber-optic equivalents of classic interferometers, e.g., Michelson interferometers, and ring laser gyroscopes. It also includes detection of changes in the state of polarization in a light conductor, e.g., induced birefringence by stresses or strains.

(3) Note. This is a residual subclass in a residual class and other classes and subclasses, e.g., Class 356, subclasses 32+ or 345+, provide for this subject matter where optical measurement and testing are involved, and take precedence. Cross-references to this subclass (277.19) are discretionary.

SEE OR SEARCH THIS CLASS, SUBCLASS:

550, interference pattern analysis for related subject matter which may or may not involve light conductors but which does not claim significant light conductor means.

SEE OR SEARCH CLASS 356, Optics: Measuring, and Testing,

345+, for measuring and testing by light interference involving, inter alia, coherent interferometric light.

359, Optics: Systems (Including Communication) and Elements,

1+, provide for holos:graphic systems which employ coherent interferometric light.

365, Static Information Storage and Retrieval,

215+, for optical, including holos:graphic, read/write circuits which may include light conductors handling interferometric light.