| 356 / | HD | OPTICS: MEASURING AND TESTING |
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| 928 | DD | INVESTIGATING OR ANALYZING MATERIALS BY THE USE OF OPTICAL MEANS, I.E., USING INFRA-RED, VISIBLE, OR ULTRA-VIOLET LIGHT (GO1N 21/00) {5} |
| 931 |  | .~ Systems in which incident light is modified in accordance with the properties of material investigated (GO1N 21/17) {8} |
| 932 | DD | .~.~> With opto-acoustic detection, e.g., for gases or analyzing solids (GO1N 21/17B) |
| 933 | DD | .~.~> With calorimetric detection, e.g., with thermal lens detection (GO1N 21/17C) |
| 934 | DD | .~.~> With modulation of one or more physical properties of the sample during optical investigation, e.g., Electra reflectance (GO1N 21/17M) |
| 935 | DD | .~.~> Dichroism (GO1N 21/19) |
| 936 | DD | .~.~> Polarization-affecting properties (GO1N 21/21) {2} |
| 939 | DD | .~.~> Color; spectral properties, i,e., comparison of effect of material on the light at two or more different wavelengths or wavelength bands (GO1N 21/25) {4} |
| 946 | DD | .~.~> Holographic interferometry (GO1N 21/45B) |
| 947 | DD | .~.~> Scattering, i.e., diffuse reflection (GO1N 21/47F) |