Measuring optical phase difference (devices or arrangements for controlling the phase of light beams G02F1/01); Determining degree of coherence; Measuring optical wavelength (spectrometry G01J3/00)

Introduced: January 1980

Title

Titles differ between systems:

IPC: Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength

CPC: Measuring optical phase difference (devices or arrangements for controlling the phase of light beams G02F1/01); Determining degree of coherence; Measuring optical wavelength (spectrometry G01J3/00)

Full Title

Full titles differ between systems:

IPC:

Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength

CPC:

Measuring optical phase difference (devices or arrangements for controlling the phase of light beams G02F1/01); Determining degree of coherence; Measuring optical wavelength (spectrometry G01J3/00)

CPC subdivides this area 3x more granularly than IPC with 3 additional codes.

3 codes are CPC-only extensions.

Note: 3 CPC extensions are marked as secondary classification only.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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G01J 2009/002 2nd only CPC only CPC only
G01J 2009/004 2nd only CPC only CPC only
G01J 2009/006 2nd only +1 CPC CPC only CPC only
G01J 9/02 by interferometric methods (using interferometers for measuring optically the linear dimensions of objects G01B9/02) since 1980 +16 CPC IPC+CPC Available in IPC and CPC
G01J 9/04 by beating two waves of a same source but of different frequency and measuring the phase shift of the lower frequency obtained since 1980 IPC+CPC Available in IPC and CPC