Detection device, optical path length measurement device, measurement instrument, optical member evaluation method, and temperature change detection method
US7426038B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 6, 2004 |
| Grant date | Sep 16, 2008 |
| Priority date | — |
| Expiry date | Aug 18, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/331
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An object of the invention is to provide a detection apparatus, an optical path length measuring apparatus, a method for evaluating an optical member, and the like, which can evaluate optical characteristics such as chromatic dispersion and an optical path length at a high speed. Another object is to provide a detection apparatus and a method for detecting a change in temperature, which can evaluate chemical and biological reactions and an effect of hyperthermia with high accuracy. In a detection apparatus 10A, zero-order light B0 undergoing chromatic dispersion of a measurement object S is superimposed on first-order light B1 shifted in frequency, whereby a low-frequency beat is produced, and wavelength dependence of a beat phase thereof is measured. Moreover, using an AC electric signal from a frequency shifter 12 as a phase reference signal, a relative position of a probe signal is detected. In addition, it is effective to shift the frequencies of probe light and reference light having mutually different wavelengths and determine a beat phase of probe light in a relative manner on the basis of a beat phase of reference light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.