5 results about "Optical fiber sensing" patented technology

The invention relates to a spatial resolution calibration device and a spatial resolution calibration method for distributed fiber-optic sensing. The spatial resolution calibration device and the spatial resolution calibration method for the distributed fiber-optic sensing are easy to understand and operate; and the spatial resolution of various distributed fiber-optic sensors is objectively and accurately calibrated, and a reference is provided for the work such as apparatus selection and purchasing, performance evaluation, monitoring design, measurement and data analysis of a technician. The technical scheme is that: the spatial resolution calibration device for a distributed fiber-optic sensing demodulator is characterized by comprising a water bath which is divided into two parts, wherein one side of the water bath is a low-temperature tank, and the other side of the water bath is a high-temperature tank with a heater; a cover plate is arranged on the water bath; and a reel holder is vertically arranged on each of the two sides of a middle partition plate in the water bath. The device and the method are applied to the spatial resolution calibration of modulation apparatuses such as a Raman optical time-domain reflectometer (ROTDR) and a Brillouin optical time-domain analyzer (BOTDA)/Brillouin optical time-domain reflectometer (BOTDR).

The invention relates to an embedding method of a lithium battery sensing optical fiber. The key is to avoid physical damage, optical performance decline or battery electrolyte performance decline ofthe optical fiber sensor after long-term use caused by direct contact between the optical fiber and electrolyte. The method has a plurality of modes and is suitable for a plurality of practical environments. The optical fiber sensor can be effectively embedded into the lithium battery to monitor various sensing quantities such as temperature, vibration, strain/stress and the like without affectingthe battery performance and the optical fiber sensing performance. The embedding process and the sealing process for arranging optical fibers into lithium batteries can be provided and a good foundation is laid for distributed optical fiber temperature measurement inside lithium batteries in the later period.

The invention discloses a fetal heart rate monitoring belly supporting belt based on optical fiber sensing. The fetal heart rate monitoring belly supporting belt is characterized in that each pre-bent optical fiber sensing unit is fixed on a corresponding vibration sensitive membrane, and each pre-bent optical fiber sensing unit and the corresponding vibration sensitive membrane are embedded in a fabric of a belly supporting belt body; a light source is used for sending laser to each pre-bent optical fiber sensing unit, and an optical signal receiving assembly is used for receiving laser signals modulated by vibration signals when passing through each pre-bent optical fiber sensing unit and converting the laser signals modulated by the vibration signals into corresponding multi-path electric signals with physiological feature information; and a signal processing and analyzing module is used for separating fetal heartbeat information. The vibration signals caused by heartbeat and fetal movement of a fetus are sensed based on an optical fiber high-sensitivity vibration sensing technology, and continuous real-time monitoring of the health state of the fetus is achieved through processing and analysis of the multi-path signals.