30results about How to "Modulation signal frequency adjustable" patented technology

The invention discloses a fiber sensing system based on a fiber laser, and belongs to the technical field of fiber sensors. The main structure of the system comprises a pump source (1), an optical multiplexer (2), and an Er-doped optical fiber (3). According to the invention, a sine signal is taken as a modulation signal, and no high-frequency interference can be generated, so the system is more reliable in working, is high in sensing precision, and is wide in application range.

The invention provides a micro-stress sensor for bridge monitoring, and belongs to the technical field of optical fiber sensors. The sensor is mainly provided with a pumping source (1), an optical wavelength division multiplexer (2), and an erbium-doped optical fiber (3). The sine signal is used as a modulation signal, high-frequency interference cannot be generated, and the sensor has the advantages of being more reliable in work, and high in sensing precision.

The invention discloses a temperature sensor based on a Mach-Zehnder interference structure, and belongs to the technical field of optical fiber sensors. The main structure of the temperature sensor comprises a pumping source (1), an optical wavelength division multiplexer (2), an Er-doped optical fiber. By use of the temperature sensor, a sinusoidal signal is taken as a modulation signal, no high-frequency interference is generated, and the temperature sensor has the characteristics of being reliable in working, high in sensing accuracy, wide in application range and the like.

The invention relates to a temperature sensing system used for mine safety monitoring and belongs to the technical field of optical fiber sensors. The temperature sensing system mainly comprises a pumping source (1), a first optical coupler (2), an optical wavelength division multiplexer (3) and the like. The temperature sensing system provided by the invention uses a sinusoidal signal as a modulating signal, can not produce high-frequency interference and has the characteristics of more reliable work and high sensing precision.

The invention relates to a high-precision optical fiber sensor based on a Mach-Zehnder interference structure and belongs to the technical field of optical fiber sensors. The high-precision optical fiber sensor mainly comprises a pumping source (1), a first optical coupler (2), an optical wavelength division multiplexer (3) and the like. The high-precision optical fiber sensor provided by the invention uses a sinusoidal signal as a modulating signal, can not produce high-frequency interference and has the characteristics of more reliable work, high sensing precision and wide application range.

The invention discloses a high-precision stress sensing system based on Michelson interference structure and belongs to the technical field of optical fiber sensors. The main structure of the high-precision stress sensing system comprises a pumping source (1), an optical wavelength division multiplexer (3), an erbium-doped optical fiber (3) and the like. The high-precision stress sensing system uses a sinusoidal signal as a modulation signal, does not generate high-frequency interference, and is reliable in operation, high in sensing precision and wide in application range.