IPC 7 English version G01J !A-G01J 11/00

G01J-G01J01100

SECTION G – PHYSICS

G 01

MEASURING (counting G06M); TESTING

G 01 J

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

Notes

(1)

This subclass covers the detection of the presence or absence of infra-red, visible, or ultra-violet light, not otherwise provided for.

(2)

Attention is drawn to the Notes following the title of class G01.

Subclass Index

PHOTOMETRY; PYROMETRY

G01J 1/00; G01J 5/00

SPECTROMETRY; MEASURING: POLARISATION; VELOCITY; PHASE; PULSES

G01J 3/00; G01J 4/00; G01J 7/00; G01J 9/00; G01J 11/00

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

Details

Optical or mechanical part

Restricting the angle of incident light

Arrangements of light sources specially adapted for photometry

by comparison with reference light or electric value

using wholly visual means (G01J 1/20 takes precedence)

using comparison with a surface of graded brightness

using electric radiation detectors (G01J 1/20 takes precedence)

using comparison with a reference electric value

intensity of the measured or reference value being varied to equalise their effects at the detector, e.g. by varying incidence angle

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

using electric radiation detectors

adapted for automatic variation of the measured or reference value (regulation of light intensity G05D 25/00)

using variation of intensity or distance of source (G01J 1/34 takes precedence)

using electric radiation detectors

adapted for automatic variation of the measured or reference value (regulation of light intensity G05D 25/00)

using separate light-paths used alternately or sequentially, e.g. flicker

using electric radiation detectors

using wholly visual means (G01J 1/10 takes precedence)

using limit of visibility or extinction effect

using electric radiation detectors (optical or mechanical part G01J 1/04; by comparison with a reference light or electric value G01J 1/10)

Electric circuits

using a capacitor

using chemical effects

using change in colour of an indicator, e.g. actinometer

using photographic effects

by observing photo-reactions between gases

using radiation pressure or radiometer effect

using luminescence generated by light

by measuring the pupil of the eye

Spectrometry; Spectrophotometry; Monochromators; Measuring colours [4]

Details

Slit arrangements

Scanning arrangements

Beam-switching arrangements

Arrangements of light sources specially adapted for spectrometry or colorimetry

Generating the spectrum; Monochromators

using refracting elements, e.g. prism (G01J 3/18, G01J 3/26 take precedence)

with autocollimation

using diffraction elements, e.g. grating (gratings per se G02B)

Rowland circle spectrometers

Littrow mirror spectrometers

using gratings profiled to favour a specific order

using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filter

Investigating the spectrum (using colour filters G01J 3/51) [4]

Measuring the intensity of spectral lines directly on the spectrum itself (G01J 3/42, G01J 3/44 take precedence)

Investigating bands of a spectrum in sequence by a single detector

Investigating two or more bands of a spectrum by separate detectors

Measuring the intensity of spectral lines by determining density of a photograph of the spectrum; Spectrography (G01J 3/42, G01J 3/44 take precedence) [4]

Absorption spectrometry; Double-beam spectrometry; Flicker spectrometry; Reflection spectrometry (beam-switching arrangements G01J 3/08) [4]

427

Dual wavelength spectrometry [4]

433

Modulation spectrometry; Derivative spectrometry [4]

Raman spectrometry; Scattering spectrometry [4]

443

Emission spectrometry [4]

447

Polarisation spectrometry [4]

Interferometric spectrometry [4]

453

by correlation of the amplitudes [4]

457

Correlation spectrometry, e.g. of the intensity (G01J 3/453 takes precedence) [4]

Measurement of colour; Colour measuring devices, e.g. colorimeters (measuring colour temperature G01J 5/60) [4]

using electric radiation detectors [4]

using colour filters [4]

using colour charts

Measuring polarisation of light (investigating or analysing materials by measuring rotation of plane of polarised light G01N 21/21) [2]

Polarimeters of separated-field type; Polarimeters of half-shadow type [2]

Polarimeters using electric detection means (G01J 4/02 takes precedence) [2]

Radiation pyrometry (photometry in general G01J 1/00; spectrometry in general G01J 3/00)

Details

Casings

Arrangements for eliminating effects of disturbing radiation

Optical features

using electric radiation detectors

using thermoelectric elements, e.g. thermocouples (thermoelectric elements per se H01L 35/00, H01L 37/00)

Electrical features

Arrangements with respect to the cold junction; Compensating influence of ambient temperature or other variables

Special adaptation for indicating or recording (indicating or recording measured values in general G01D)

using resistors, thermistors, or semiconductors sensitive to radiation

Electrical features

Use of a specially-adapted circuit, e.g. bridge circuit

Special adaptation for indicating or recording

using photo-emissive, photo-conductive, or photo-voltaic cells

Electrical features

Special adaptation for indicating or recording

using capacitors

using ionisation of gases

using extension or expansion of solids or fluids

using bimetallic elements

using Golay cells

using change of resonant frequency, e.g. of piezo-electric crystal

using radiation pressure or radiometer effect

using wholly visual means

using techniques specified in the subgroups below

using comparison with reference sources, e.g. disappearing-filament pyrometer

Optical features

Electrical features

using absorption; using polarisation; using extinction effect

using determination of colour temperature

using means for chopping the light

Measuring velocity of light

Measuring optical phase difference (devices or arrangements for controlling the phase of light beams G02F 1/01); Determining degree of coherence; Measuring optical wavelength (spectrometry G02F 3/00) [3]

by interferometric methods (using interferometers for measuring optically the linear dimensions of objects G01B 9/02) [3]

by beating two waves of the same source but of different frequency and measuring the phase shift of the lower frequency obtained [3]

11/

Measuring the characteristics of individual optical pulses or of optical pulse trains [5]