Terahertz time domain spectroscopic apparatus
US10352849B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2017 |
| Grant date | Jul 16, 2019 |
| Priority date | — |
| Expiry date | Jul 21, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/3577
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A terahertz wave is spectrally dispersed into two waves which are caused to pass through a sample liquid film 101 and a reference liquid film 102 and are then collected, and the terahertz waves in an interference state are detected by a terahertz wave detecting semiconductor 15. Consequently, only spectroscopic information related to a distinctive characteristic of the sample liquid film 101 is detected. In addition, a predetermined optical path length difference is provided between a path where the terahertz wave is transmitted through the sample liquid film 101 and a path where the terahertz wave is transmitted through the reference liquid film 102 by an optical delaying unit 17. Ina frequency spectrum obtained by performing Fourier transformation over a terahertz wave signal having an interference waveform by a terahertz wave signal analyzing device 20, consequently, a feature caused by an interaction of dissimilar molecules in the sample liquid film 101 appears in a spectral intensity at a frequency depending on the optical path length difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.