|  | G |
SECTION G — PHYSICS

INSTRUMENTS

|  | G01 |
MEASURING (counting Fulltext... Hierarchy... Expanded...G06M); TESTING

|  | G01J |
MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, OR PHASE OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources Fulltext... Hierarchy... Expanded...F21, Fulltext... Hierarchy... Expanded...H01J, Fulltext... Hierarchy... Expanded...H01K, Fulltext... Hierarchy... Expanded...H05B; investigating properties of materials by optical means Fulltext... Hierarchy... Expanded...G01N) [2]

|  | G01J |
Note(s) Attention is drawn to the notes immediately following the class title (Fulltext... Hierarchy... Expanded...G01). This sub-class includes the detection of the presence or absence of infra-red, visible, or ultra-violet light, not otherwise provided for.

|  | G01J 1/00 |
Photometry, e.g. photographic exposure meter (spectrophotometry Fulltext... Hierarchy... Expanded...G01J 3/00; specially adapted for radiation pyrometry Fulltext... Hierarchy... Expanded...G01J 5/00)

|  | G01J 1/02 |
· | Details

|  | G01J 1/04 |
· · | Optical or mechanical part

|  | G01J 1/06 |
· · · | Restricting the angle of incident light

|  | G01J 1/08 |
· · | Arrangements of light sources specially adapted for photometry

|  | G01J 1/10 |
· | by comparison with reference light or electric value

|  | G01J 1/12 |
· · | using wholly visual means (Fulltext... Hierarchy... Expanded...G01J 1/20 takes precedence)

|  | G01J 1/14 |
· · · | using comparison with a surface of graded brightness

|  | G01J 1/16 |
· · | using electric radiation detectors (Fulltext... Hierarchy... Expanded...G01J 1/20 takes precedence)

|  | G01J 1/18 |
· · · | using comparison with a reference electric value

|  | G01J 1/20 |
· · | intensity of the measured or reference value being varied to equalise their effects at the detector, e.g. by varying incidence angle

|  | G01J 1/22 |
· · · | using a variable element in the light-path, e.g. filter, polarising means (Fulltext... Hierarchy... Expanded...G01J 1/34 takes precedence)

|  | G01J 1/24 |
· · · · | using electric radiation detectors

|  | G01J 1/26 |
· · · · · | adapted for automatic variation of the measured or reference value (regulation of light intensity Fulltext... Hierarchy... Expanded...G05D 25/00)

|  | G01J 1/28 |
· · · | using variation of intensity or distance of source (Fulltext... Hierarchy... Expanded...G01J 1/34 takes precedence)

|  | G01J 1/30 |
· · · · | using electric radiation detectors

|  | G01J 1/32 |
· · · · · | adapted for automatic variation of the measured or reference value (regulation of light intensity Fulltext... Hierarchy... Expanded...G05D 25/00)

|  | G01J 1/34 |
· · · | using separate light-paths used alternately or sequentially, e.g. flicker

|  | G01J 1/36 |
· · · · | using electric radiation detectors

|  | G01J 1/38 |
· | using wholly visual means (Fulltext... Hierarchy... Expanded...G01J 1/10 takes precedence)

|  | G01J 1/40 |
· · | using limit of visibility or extinction effect

|  | G01J 1/42 |
· | using electric radiation detectors (optical or mechanical part Fulltext... Hierarchy... Expanded...G01J 1/04; by comparison with a reference light or electric value Fulltext... Hierarchy... Expanded...G01J 1/10)

|  | G01J 1/44 |
· · | Electric circuits

|  | G01J 1/46 |
· · · | using a capacitor

|  | G01J 1/48 |
· | using chemical effects

|  | G01J 1/50 |
· · | using change in colour of an indicator, e.g. actinometer

|  | G01J 1/52 |
· · | using photographic effects

|  | G01J 1/54 |
· · | by observing photo-reactions between gases

|  | G01J 1/56 |
· | using radiation pressure or radiometer effect

|  | G01J 1/58 |
· | using luminescence generated by light

|  | G01J 1/60 |
· | by measuring the pupil of the eye

|  | G01J 3/00 |
Spectrometry; Spectrophotometry; Monochromators; Measuring colour; Colorimeters (specially adapted for radiation pyrometry Fulltext... Hierarchy... Expanded...G01J 5/00)

|  | G01J 3/02 |
· | Details

|  | G01J 3/04 |
· · | Slit arrangements

|  | G01J 3/06 |
· · | Scanning arrangements

|  | G01J 3/08 |
· · | Beam-switching arrangements

|  | G01J 3/10 |
· · | Arrangements of light sources specially adapted for spectrometry or colorimetry

|  | G01J 3/12 |
· | Generating the spectrum; Monochromators

|  | G01J 3/14 |
· · | using refracting elements, e.g. prism (Fulltext... Hierarchy... Expanded...G01J 3/18, Fulltext... Hierarchy... Expanded...G01J 3/26 take precedence)

|  | G01J 3/16 |
· · · | with autocollimation

|  | G01J 3/18 |
· · | using diffraction elements, e.g. grating (gratings per se Fulltext... Hierarchy... Expanded...G02B)

|  | G01J 3/20 |
· · · | Rowland circle spectrometers

|  | G01J 3/22 |
· · · | Littrow mirror spectrometers

|  | G01J 3/24 |
· · · | using gratings profiled to favour a specific order

|  | G01J 3/26 |
· · | using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filter

|  | G01J 3/28 |
· | Investigating the spectrum (using colour filters Fulltext... Hierarchy... Expanded...G01J 3/48)

|  | G01J 3/30 |
· · | Measuring the intensity of spectral lines directly on the spectrum itself (Fulltext... Hierarchy... Expanded...G01J 3/42, Fulltext... Hierarchy... Expanded...G01J 3/44 take precedence)

|  | G01J 3/32 |
· · · | Investigating bands of a spectrum in sequence by a single detector

|  | G01J 3/34 |
· · · · | using electric radiation detectors

|  | G01J 3/36 |
· · · | Investigating two or more bands of a spectrum by separate detectors

|  | G01J 3/38 |
· · · · | using electric radiation detectors

|  | G01J 3/40 |
· · | Measuring the intensity of spectral lines by determining density of a photograph of the spectrum (Fulltext... Hierarchy... Expanded...G01J 3/42, Fulltext... Hierarchy... Expanded...G01J 3/44 take precedence)

|  | G01J 3/42 |
· · | Absorption spectrometry; Double-beam spectrometry; Flicker spectrometry (beam-switching arrangements Fulltext... Hierarchy... Expanded...G01J 3/08)

|  | G01J 3/44 |
· · | Raman spectrometry

|  | G01J 3/46 |
· | Measurement of colour; Colorimeters (measuring colour temperature Fulltext... Hierarchy... Expanded...G01J 5/60)

|  | G01J 3/48 |
· · | using colour filters

|  | G01J 3/50 |
· · · | using electric radiation detectors

|  | G01J 3/52 |
· · | using colour charts

|  | G01J 4/00 |
Measuring polarisation of light (investigating or analysing materials by measuring rotation of plane of polarised light Fulltext... Hierarchy... Expanded...G01N 21/21) [2]

|  | G01J 4/02 |
· | Polarimeters of separated-field type; Polarimeters of half-shadow type [2]

|  | G01J 4/04 |
· | Polarimeters using electric detection means (Fulltext... Hierarchy... Expanded...G01J 4/02 takes precedence) [2]

|  | G01J 5/00 |
Radiation pyrometry (photometry in general Fulltext... Hierarchy... Expanded...G01J 1/00; spectrometry in general Fulltext... Hierarchy... Expanded...G01J 3/00)

|  | G01J 5/02 |
· | Details

|  | G01J 5/04 |
· · | Casings

|  | G01J 5/06 |
· · | Arrangements for eliminating effects of disturbing radiation

|  | G01J 5/08 |
· · | Optical features

|  | G01J 5/10 |
· | using electric radiation detectors

|  | G01J 5/12 |
· · | using thermoelectric elements, e.g. thermocouples (thermoelectric elements per se Fulltext... Hierarchy... Expanded...H01L 35/00, Fulltext... Hierarchy... Expanded...H01L 37/00)

|  | G01J 5/14 |
· · · | Electrical features

|  | G01J 5/16 |
· · · · | Arrangements with respect to the cold junction; Compensating influence of ambient temperature or other variables

|  | G01J 5/18 |
· · · · | Special adaptation for indicating or recording (indicating or recording measured values in general Fulltext... Hierarchy... Expanded...G01D)

|  | G01J 5/20 |
· · | using resistors, thermistors, or semiconductors sensitive to radiation

|  | G01J 5/22 |
· · · | Electrical features

|  | G01J 5/24 |
· · · · | Use of a specially-adapted circuit, e.g. bridge circuit

|  | G01J 5/26 |
· · · · | Special adaptation for indicating or recording (indicating or recording measured values in general Fulltext... Hierarchy... Expanded...G01D)

|  | G01J 5/28 |
· · | using photo-emissive, photo-conductive, or photo-voltaic cells

|  | G01J 5/30 |
· · · | Electrical features

|  | G01J 5/32 |
· · · · | Special adaptation for indicating or recording (indicating or recording measured values in general Fulltext... Hierarchy... Expanded...G01D)

|  | G01J 5/34 |
· · | using capacitors

|  | G01J 5/36 |
· · | using ionisation of gases

|  | G01J 5/38 |
· | using extension or expansion of solids or fluids

|  | G01J 5/40 |
· · | using bimetallic elements

|  | G01J 5/42 |
· · | using Golay cells

|  | G01J 5/44 |
· · | using change of resonant frequency, e.g. of piezo-electric crystal

|  | G01J 5/46 |
· | using radiation pressure or radiometer effect

|  | G01J 5/48 |
· | using wholly visual means

|  | G01J 5/50 |
· | using techniques specified in the sub-groups below

|  | G01J 5/52 |
· · | using comparison with reference sources, e.g. disappearing-filament pyrometer

|  | G01J 5/54 |
· · · | Optical features

|  | G01J 5/56 |
· · · | Electrical features

|  | G01J 5/58 |
· · | using absorption; using polarisation; using extinction effect

|  | G01J 5/60 |
· · | using determination of colour temperature

|  | G01J 5/62 |
· · | using means for chopping the light

|  | G01J 7/00 |
Measuring velocity of light

|  | G01J 9/00 |
Measuring optical phase difference (controlling the phase of light beams Fulltext... Hierarchy... Expanded...G02F 1/01); Determining degree of coherence; Measuring optical wavelength (spectrometry Fulltext... Hierarchy... Expanded...G02F 3/00) [3]

|  | G01J 9/02 |
· | by interferometric methods (using interferometers for measuring optically the linear dimensions of objects Fulltext... Hierarchy... Expanded...G01B 9/02) [3]

|  | G01J 9/04 |
· | by beating two waves of the same source but of different frequency and measuring the phase shift of the lower frequency obtained [3]