40results about How to "No high frequency interference" patented technology

The invention provides a spacecraft fluid ring reaction performing mechanism. The spacecraft fluid ring reaction performing mechanism comprises a mounting base used for mounting a fluid ring and corresponding devices, the fluid ring used for generating angular momentum, an electromagnetic pump assembly which mainly comprises a permanent magnet or an electromagnet and an electrode board pair and is used for driving liquid in the fluid ring to do controllable-speed flowing, a filling liquid which employs a conductive liquid material, is mounted in the fluid ring and flows under the driving action of the electromagnetic pump assembly, and a shielding box which covers outside an electromagnetic pump and is used for shielding an electric field and a magnetic field to prevent interference of external devices. The spacecraft fluid ring reaction performing mechanism utilizes the electromagnetic pump to drive the liquid ring to generate angular momentum to realize attitude control of a spacecraft, can provide multi-axial control moments for attitude control of spacecrafts especially micro satellites, requires no mechanical rotation bearing part and further has properties of high reliability, simple structure and small energy consumption.

The invention discloses a fiber sensor based on Michelson interference and belongs to the technical field of the fiber sensor. A main structure of the fiber sensor comprises a pump source (1), a firstoptical coupler (2), an optical wavelength division multiplexer (3) and the like. According to the fiber sensor, a sinusoidal signal is taken as a modulation signal and high frequency interference isnot generated. The fiber sensor is characterized by relatively reliable working, high sensing precision and wide application range.

The invention relates to a motor speed adjusting device. A control circuit of the motor speed controller mainly comprises a PWM (pulse-width modulation) unit, a main control unit and a load unit, wherein the PWM unit outputs a pulse wave with an adjustable duty ratio to the main control unit, the main control unit is connected with two ends of a capacitor of the load unit in parallel so as to be used for controlling the capacitor to charge or discharge, the capacitor of the load unit is in serial connection on a motor needing of speed adjustment, the PWM unit outputs the pulse wave to the main control unit, the main control unit taken as a switch is connected at the two ends of the capacitor of the load unit in parallel, the load unit and the capacitor are connected on the motor in series, the pulse wave controls the connection and the disconnection of the switch to carrying out charge and discharge on the capacitor, when the duty ratio of the pulse wave is adjusted, and changed pulse signals are converted into the change of charge and discharge time of the capacitor by the main control unit, so that the reactance value of a reactor can change along with the change of the charge and discharge time, so as to realize stepless speed adjustment. Compared with the prior art, the motor speed adjusting device is easy in circuit, easy to realize, low in manufacturing cost, simultaneously can not generate high-frequency interference and can realize the stepless speed adjustment on the motor.

The invention relates to a temperature sensing system for mine safety monitoring and belongs to the technical field of optical fiber sensors. Its main structure includes a pumping source (1), a first optical coupler (2), an optical wavelength division multiplexer (3) and the like. The invention uses a sinusoidal signal as a modulation signal, does not generate high-frequency interference, and has the characteristics of more reliable operation and high sensing precision.

The invention discloses a highly precise micro-stress sensor, and belongs to the technical field of optical fiber sensors. The main structure of the micro-stress sensor comprises a pump source (1), anoptical wavelength division multiplexer (2), an erbium doped fiber (3), and the like. According to the highly precise micro-stress sensor a sinusoidal signal is used as a modulation signal, high-frequency interference is not generated, and the micro-stress sensor has the characteristics of being more reliable in operation, high in sensing precision, wide in application range, and the like.

The invention provides a micro stress sensor based on phase comparison, and belongs to the technical field of optical fiber sensors. The main structure of the micro stress sensor comprises a pumping source (1), an optical wavelength division multiplexer (2), an erbium doped optical fiber (3), and the like. The micro stress sensor provided by the invention uses a sinusoidal signal as a modulation signal, thereby generating no high frequency interference, and having the characteristics of more reliable work, high sensing precision, wide application range, etc.

The invention belongs to the technical field of AC charging piles, especially to an aging test device for AC charging piles. The aging test device comprises a tester interface, a current power control unit, an auxiliary power supply, a phase detection unit, a communication unit and a human computer interface. The aging test device further comprises a current equalization unit, a current adjusting unit and an AC current multiplier, wherein the current power control unit controls the current adjusting unit through the current equalization unit to output two paths of current with different magnitudes, the current adjusting unit is connected with the AC current multiplier, the AC current multiplier comprises a live-line current multiplier and a neutral-line current multiplier, and the live-line current multiplier and the neutral-line current multiplier are serially connected to a live line and a neutral line, which connect a test input interface and a test output interface. The aging test device is safe, reliable, convenient, energy saving and environmentally friendly.

The invention refers to a device and a method for scanning an optical data carrier (1) by means of a main scanning beam (3) being reflected by the data carrier (1) and being detected by means of a photodetector (10), the data carrier (1) having first and second layers (11,12) to be scanned, the second layer (12) being scanned through the first layer (11), light passing the first layer (11) being shaded dependent on local properties of the first layer (11). An object of the invention is to propose a device having increased performance even for use with multi layer disks (1) having a layer (11) causing light fluctuations on a layer (12) to be scanned, as well as a respective method. According to the invention such device is provided with means (2,7,17) for keeping an output signal (D) of the photodetector (10) independent of variations of shading.

The invention discloses a multipurpose fiber sensor and belongs to the technical field of a fiber sensor. A main structure of the multipurpose fiber sensor comprises a pump source (1), an optical wavelength division multiplexer (2), an erbium-doped fiber (3) and the like. According to the multipurpose optical fiber sensor, a sinusoidal signal is taken as a modulation signal and high frequency interference is not generated. The multipurpose fiber sensor is characterized by relatively reliable working, high sensing precision and wide application range.

The invention discloses an optical fiber sensor based on sine wave modulation, and belongs to the technical field of optical fiber sensors. The main structure is a pump source (1), an optical wavelength division multiplexer (3), an erbium doped fiber (3) and the like. According to the optical fiber sensor based on sine wave modulation, a sinusoidal signal is used as a modulation signal, high-frequency interference is not generated, and the invention has the characteristics of being more reliable in operation, high in sensing precision, wide in application range and the like.

A high-precision stress sensor based on Bragg fiber grating provided by the invention belongs to the technical field of optical fiber sensors. The sensor comprises the main structures of a pump source(1), a first photocoupler (2), an optical wavelength division multiplexer (3), and the like. The high-precision stress sensor provided by the invention uses a sinusoidal signal as the modulation signal without generating high-frequency interference, and has the characteristics such as more reliable work, high sensing precision and wide 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.