G01J 9/02
Measuring optical phase difference: by interferometric methods
Official title: by interferometric methods (using interferometers for measuring optically the linear dimensions of objects G01B9/02)
G01J9/02 (Measuring optical phase difference: by interferometric methods) appears on 992 US grants and 689 published applications in this corpus.
Search patents in G01J- Granted patents
- 992
- Published applications
- 689
- Assignees
- 547
- Inventors
- 1,926
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 9 | 0 |
| 1980 | 4 | 0 |
| 1981 | 4 | 0 |
| 1982 | 5 | 0 |
| 1983 | 3 | 0 |
| 1984 | 6 | 0 |
| 1985 | 9 | 0 |
| 1986 | 15 | 0 |
| 1987 | 18 | 0 |
| 1988 | 21 | 0 |
| 1989 | 19 | 0 |
| 1990 | 22 | 0 |
| 1991 | 26 | 0 |
| 1992 | 14 | 0 |
| 1993 | 21 | 0 |
| 1994 | 14 | 0 |
| 1995 | 17 | 0 |
| 1996 | 20 | 0 |
| 1997 | 12 | 0 |
| 1998 | 16 | 0 |
| 1999 | 21 | 0 |
| 2000 | 19 | 0 |
| 2001 | 14 | 3 |
| 2002 | 20 | 40 |
| 2003 | 36 | 39 |
| 2004 | 23 | 32 |
| 2005 | 31 | 39 |
| 2006 | 36 | 42 |
| 2007 | 27 | 31 |
| 2008 | 39 | 22 |
| 2009 | 35 | 22 |
| 2010 | 21 | 21 |
| 2011 | 16 | 16 |
| 2012 | 16 | 15 |
| 2013 | 18 | 17 |
| 2014 | 16 | 18 |
| 2015 | 18 | 30 |
| 2016 | 28 | 19 |
| 2017 | 23 | 22 |
| 2018 | 24 | 32 |
| 2019 | 44 | 34 |
| 2020 | 30 | 36 |
| 2021 | 32 | 33 |
| 2022 | 38 | 32 |
| 2023 | 18 | 31 |
| 2024 | 25 | 25 |
| 2025 | 28 | 24 |
| 2026 | 15 | 14 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01J 9/0246Measuring optical wavelength236
- G01J 9/0215By shearing interferometric methods165
- G01J 2009/0226FibresIndexing code78
- G01J 2009/0261PolarisedIndexing code74
- G01J 2009/0234Measurement of the fringe patternIndexing code45
- G01J 2009/028TypesIndexing code45
- G01J 2009/0257MultipleIndexing code33
- G01J 2009/0249With modulationIndexing code28
All 16 subgroupsShow fewer
- G01J 2009/0223Common path interferometryIndexing code25
- G01J 2009/0211For measuring coherenceIndexing code22
- G01J 2009/0203Phased array of beamsIndexing code8
- G01J 2009/0207Double frequencyIndexing code8
- G01J 2009/0269Microscope typeIndexing code8
- G01J 2009/0273Ring interferometerIndexing code5
- G01J 2009/0276Stellar interferometerIndexing code4
- G01J 2009/0242CompensatorIndexing code2
Recent patents
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- Integrated high-extinction ratio unbalanced Mach Zehnder interferometers and integrated Mach Zehnder interferometers incorporating coil resonators11 Aug 2026US 12,704,674 B2The Regents of the University of California
- Interferometric wavemeter for broadband sensors in photonic systems21 Jul 2026US 12,687,383 B2Intel Corporation
- Optical element, wavelength detection unit, and light generation unit17 Sep 2026US 2026/0276453 A1Hamamatsu Photonics K.K.
- Laser Phase Noise Measurement using Multi-Laser Interferometry and Sub-Nyquist Sampling27 Aug 2026US 2026/0251506 A1NEC Laboratories America, Inc.
- Polarimetric phase imaging13 Aug 2026US 2026/0235445 A1Centre National De La Recherche Scientifique
- Method and system to stabilize a frequency sum generated laser13 Aug 2026US 2026/0237955 A1ASML Netherlands B. V.
- Optical component and wavefront analyzer comprising such an optical component16 Jul 2026US 2026/0202253 A1Office National D’Etudes Et De Recherches AéRospatiales
Most cited
By later US patents
- Method and apparatus for acquiring images using a ccd detector array and no transverse scanner522US 5,465,147 AMassachusetts Institute of Technology · 1995
- Arrangement for spectral interferometric optical tomography and surface profile measurement324US 6,377,349 B1Carl Zeiss Jena GmbH · 2002
- Method and apparatus for performing optical imaging using frequency-domain interferometry229US 7,733,497 B2The General Hospital Corporation · 2010
- Stationary optical spectroscopic imaging in turbid objects by special light focusing and signal detection of light with various optical wavelengths226US 5,565,986 A1996
- Method and apparatus for simultaneously measuring a plurality of spectral wavelengths present in electromagnetic radiation189US 4,905,169 AThe United States of America as represented by the United States Department of Energy · 1990