3 results about "Fiber optic interferometer" patented technology

This invention relates to the field of geostress measurement, specifically to a geostress monitoring instrument for soft rock areas based on fiber optic technology. The instrument includes: a cylindrical outer shell with a first through-hole along its length, the outer shell having a uniform thickness throughout; a central column positioned along the center of the first through-hole; a base; a top cover; a thermometer mounted on the central column; an azimuth gauge mounted on the central column; a fiber optic sensor tray mounted on the central column; a fiber optic interferometer probe mounted on the fiber optic sensor tray; and a fiber optic cable, one end of which passes through the inner side of the central column and connects to the azimuth gauge, thermometer, and fiber optic interferometer probe, while the other end is externally connected to an optical signal modem. This invention addresses the problems of existing geostress monitoring instruments, such as large measurement errors, unclear measured physical quantities, short probe lifespan, and difficulty in adapting to complex underground environments.

This invention provides a flexible micro / nano fiber optic multiplexed chip and its monitoring system and method, belonging to the field of biomedical sensing technology. It includes: a myocardial marker detection layer with an embedded array of micro / nano fiber optic interferometers modified with different biological probes for simultaneous detection of multiple cardiovascular disease markers in sweat; a microfluidic channel layer with microfluidic channels for collecting and transmitting sweat and an outlet for sweat excretion; and a pulse wave monitoring layer with an embedded U-shaped micro / nano fiber for real-time pulse wave monitoring based on the bending loss principle, with a localized microfluidic channel inlet for sweat collection. Through the above technical solution, dual-modal multi-information synchronous monitoring is achieved, with high performance and high reliability.

This invention belongs to the field of fiber optic sensing and recognition technology, specifically an object shape recognition system based on machine learning and fiber optic microphone arrays. The system includes a measurement optical path based on a single-core feedback Sagnac fiber optic interferometer, a microphone array sensor composed of multiple fiber optic coils (a component of the optical path), an obstacle movement device, a sound source, and a signal processing unit. By sensing sound signals through the fiber optic microphone array and extracting time-frequency features using a short-time Fourier transform algorithm, combined with a ResNet50 convolutional neural network or a support vector machine (SVM) algorithm, it achieves the recognition of obstacles of different shapes and types in the sound field. This system possesses advantages such as strong anti-electromagnetic interference capability, high sensitivity, low distortion over long distances, small size, and high recognition accuracy.