| 250 / | HD | RADIANT ENERGY |
|
| 200 | DF | PHOTOCELLS; CIRCUITS AND APPARATUS {11} |
| 216 | DF | .~ Optical or pre-photocell system {11} |
| 227.11 |  | .~.~ Light conductor {14} |
| 227.12 | DF | .~.~.~> Optical delay line |
| 227.13 | DF | .~.~.~> Light pen |
| 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} |
| 227.2 | DF | .~.~.~> With imaging |
| 227.21 | DF | .~.~.~> With light chopping or modulation {1} |
| 227.23 | DF | .~.~.~> With spectral frequency/wavelength discrimination |
| 227.24 | DF | .~.~.~> With coupling enhancement means {1} |
| 227.26 | DF | .~.~.~> With scanning |
| 227.27 | DF | .~.~.~> With coherent interferrometric light |
| 227.28 | DF | .~.~.~> With specific configuration of light conductor components with respect to each other |
| 227.29 | DF | .~.~.~> With specific illumination or viewing orientation of light conductor relative to viewed object (e.g., light normal to, and detector at 45 degree angle to, viewed object) |
| 227.3 | DF | .~.~.~> With variable orientation of light conductor relative to viewed object (e.g., goniometer) |
| 227.31 | DF | .~.~.~> Side or edge illuminated light conductor or collector |
| 227.32 | DF | .~.~.~> End illuminated light conductor with noncircular geometric cross section |