Photothermal spectroscopy with hollow-core optical fiber【美国发明】
一、专利名称及专利号
名称：《Photothermal spectroscopy with hollow-core optical fiber》
专利号：US 9846118B2
二、专利说明
The present invention provides a gas measuring method based on photo thermal effect in hollow - core optical fiber comprising : filling a target gas into the core of a hollow - core optical fiber ; coupling a probe light and a periodically modulated pump light into the hollow - core optical fiber ; absorbing the pump light by the target gas resulting in the periodic modulation of the phase of the probe light ; demote - laying the phase modulation information of the probe light to obtain the concentration of the target gas , wherein the pump laser is wavelength and / or amplitude modulated . In the present invention, two lasers including a pump laser and a probe laser are used for the measurement, this approach is simple and practical. Also, the use of the hollow - core optical fiber with extremely-small core area greatly increases the optical power density, thus enhances the strength of the detected photo thermal signal; this method allows ppb level gas measurement with high selectivity , and is universally suitable for the detection of gases with absorption in near-infrared.
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