21results about How to "Increase sensing distance" patented technology

The utility model relates to a position identification device and a detection system for detecting the absolute position of an elevator car, belongs to the technical field of elevator equipment, and solves the problems of low precision, high environmental requirements, high cost and the like in the conventional method for detecting the absolute position of the elevator car. The detection system comprises a position identification device and an identification recognition device, the position identification device comprises magnetic strips installed in an elevator shaft in a segmented mode, and an upper door area, an upper floor absolute coding area, a flat layer position induction area, a lower floor absolute coding area and a lower door area are sequentially distributed on each magnetic strip. The identification recognition device reads sensing data of the Hall sensors corresponding to all the areas of the magnetic strip and outputs corresponding signals to an elevator control system. According to the utility model, the overall length of the magnetic strip is shortened, the cost is low, the absolute position detector is suitable for absolute position detection of elevator cars in high-rise and super high-rise buildings, the service life is long, the detection precision is high, the induction distance is large, the anti-interference performance is strong, and the absolute position detector is not easily influenced by ambient light intensity, cleanliness and magnetic field.

The non-contact sensor comprises an electret layer and an electrode layer which are arranged in a stacked mode, the electret layer comprises a charge transmission layer and a charge blocking layer, the charge transmission layer comprises a first polymer matrix and conductive particles, and the migration rate of charges in the charge transmission layer can be increased by adding the conductive particles; the electret layer is arranged on the surface of the electret layer, charges are promoted to migrate from the surface into the charge transmission layer, new charges can be generated at the positions where the charges migrated from the surface are located, the surface charge density and the charge quantity in the electret layer are increased, and under the action of the charge blocking layer, the charges can be prevented from leaking to the electrode layer from the charge transmission layer, charge dissipation is reduced, and the efficiency is improved. The charges can be stably stored in the electret layer for a long time; thus, under the action of the charge transport layer and the charge barrier layer, the charge storage capacity is increased, the sensing distance is increased, the efficiency and accuracy of remote detection are improved, and the performance of the non-contact sensor is improved.

The utility model relates to a motor structure which comprises a base, a rotor assembly, an iron core assembly, a motor support, an encoder plate, an encoder magnetic sheet and a magnetic sheet support, the encoder magnetic sheet is installed on the magnetic sheet support, the motor structure further comprises a pivot bearing fixed with the base, and two bearings which are coaxially installed are arranged in the pivot bearing. Compared with the prior art, the utility model has the advantages of high assembly precision, easy operation, low vibration noise, low cost, compact structure and the like.

The application discloses a compensation device and method for laser phase noise of an optical frequency domain reflectometer, and relates to the technical field of distributed optical fiber sensing. The compensation device comprises a sweep laser source module, a main interferometer module, an auxiliary interferometer module and a signal processing module. The sweep laser source module is used for outputting a first sweep laser beam and a second sweep laser beam. The main interferometer module receives the first sweep laser beam and generates a first beat frequency signal related to the position of a scattering point of a sensing optical fiber. The auxiliary interferometer module receives the second sweep laser beam and generates a second beat frequency signal related to the position of a weak reflection point of an auxiliary optical fiber. The signal processing module collects the first beat frequency signal and the second beat frequency signal, extracts phase terms of the sensing optical fiber and the auxiliary optical fiber respectively, and realizes phase noise compensation. The compensation method realizes the function of the compensation device, that is, realizes phase noise compensation, analyzes the spectrum of compensation information again, and demodulates strain information along the sensing optical fiber. The application realizes uniform compensation of phase noise, and improves the system measurement distance, spatial resolution and strain accuracy.

The invention relates to the field of distributed optical fiber sensing, in particular to a Raman distributed sensing device and method based on sinusoidal modulation light. In the device, an electro-optical modulator is driven by a sinusoidal signal output by a sinusoidal signal generator to carry out sinusoidal modulation on continuous laser output by a continuous laser, and the modulated laser is amplified by an optical amplifier and then enters a sensing optical fiber through a wavelength division multiplexer; a Raman backward anti-Stokes scattering signal generated by each point in the sensing optical fiber is output by the wavelength division multiplexer and then is detected by the photoelectric detector; and after being received and recorded by the oscilloscope, a detection signal output by the photoelectric detector is sent to the calculation unit for calculation to obtain position information and temperature information of the temperature change area. The problem that the spatial resolution is limited by the pulse width in a traditional Raman distributed optical fiber sensing system is solved, and the sensing distance can be greatly increased on the basis that the spatial resolution of the system is not reduced.

This invention relates to an optical frequency domain reflection system and method based on a voltage-controlled oscillator (VCO). The system mainly includes an arbitrary function generator, a laser, a VCO, a single-sideband modulator, an auxiliary interferometer, a main interferometer, and a polarization beam splitter. The arbitrary function generator, laser, VCO, and VSB modulator work together to generate the sweeping light required for measurement. This sweeping light is split into two paths: one path enters the main interferometer as probe light, and the other path enters the auxiliary interferometer to obtain the instantaneous frequency of the probe light. Based on the instantaneous frequency, the signal from the main interferometer is resampled using a one-dimensional interpolation method. This invention uses a low-cost, small-sized VCO as the radio frequency signal generator to generate a sweeping signal with fast frequency modulation performance, and compensates for phase noise caused by the nonlinearity of the sweeping signal by designing the optical path of the auxiliary interferometer and using a linear interpolation algorithm.

The invention discloses an NFC antenna, which comprises a ferrite layer and a flexible circuit board layer, the flexible circuit board layer comprises a base material layer, the length of the long side of the base material layer is greater than two times of the length of the short side, and a feed area is arranged at the edge of the middle part of the base material layer; the first feed point and the second feed point are arranged in the feed area; the first antenna is arranged on the first surface and extends inwards in a surrounding manner from the second feed point along the outer edge of the first surface and the inner edge of the feed area to form a plurality of circles of coil structures, and arc-shaped transition is arranged at corners; the second antenna is arranged in the feed area and extends to the second end from the first feed point; the third antenna is arranged on the second surface; the ferrite layer comprises a hollow area exposing the first feed point and the second feed point; the NFC antenna further comprises a feeder line. Through the large-area antenna arc-shaped wiring design, after matching optimization is combined, the induction distance can be greatly increased, the induction speed can be remarkably increased, and the user experience can be improved.

The embodiment of the invention discloses an interactive processing method and device based on near-field communication and near-field communication equipment. The success rate and efficiency of near-field communication between the near-field communication equipment of a merchant and a mobile phone of a user can be improved. According to the scheme, the method comprises the following steps: respectively sensing a currently approaching sensing object through a plurality of signal sensing antennas deployed on near field communication equipment; screening a near field communication antenna close to the sensing object as a target near field communication antenna from a plurality of near field communication antennas deployed on the near field communication equipment according to the difference of the signal intensities sensed by the plurality of signal sensing antennas respectively; and establishing communication with the sensing object through the target near field communication antenna so as to perform service interaction.

The invention relates to an optical frequency domain reflection system and method based on a voltage-controlled oscillator. The system part mainly comprises an arbitrary function generator, a laser, a voltage-controlled oscillator, a single side band modulator, an auxiliary interferometer, a main interferometer and a polarization beam splitter. Wherein the arbitrary function generator, the laser, the voltage-controlled oscillator and the single sideband modulator are matched to generate sweep frequency light required by measurement; the sweep-frequency light is divided into two paths, one path enters the main interferometer to serve as probe light, the other path enters the auxiliary interferometer to be used for obtaining the instantaneous frequency of the probe light, and signals of the main interferometer are resampled through a one-dimensional interpolation method according to the instantaneous frequency. According to the invention, a voltage-controlled oscillator with low cost and small volume is used as a radio frequency signal generator to generate a sweep frequency signal with fast frequency modulation performance, and phase noise caused by sweep frequency nonlinearity is compensated by designing an auxiliary interferometer optical path and a linear interpolation algorithm.

The present invention relates to the field of distributed optical fiber sensing, and discloses a gain differential measurement type high-performance chaotic Brillouin sensing device and method. The output of a chaotic laser source in the device is divided into a first and a second chaotic laser. The first chaotic laser is sequentially divided into a detection light and a differential reference light after passing through a single-sideband modulator, an erbium-doped optical fiber amplifier, and a second beam splitter. The detection light is incident on one end of the sensing optical fiber and outputted from the other end through a first optical circulator to be detected by a first photodetector, and the differential reference light is detected by a second photodetector; the second chaotic laser is sequentially divided into a pump light and a cross-correlation reference light after passing through an optical delay line, a semiconductor optical amplifier, and a third beam splitter. The pump light is amplified and injected into the sensing optical fiber from the other end, and the cross-correlation reference light is detected by a third photodetector; the three-way detection signal is processed by a computer. The present invention can suppress the interference of chaotic intensity noise, improve the system signal-to-noise ratio, and broaden the sensing distance while ensuring high spatial resolution.

The present invention relates to the field of induction door control technology, and specifically discloses a joint control method and system for smart locks, the method comprising obtaining a personnel quantity table of each work area in real time according to a preset positioning device, determining the simulation quantity of each work area according to the personnel quantity table; querying the induction door on the scene boundary in the scene map as the end point, taking each work area as the starting point, randomly generating a simulated number of passage paths included in the pedestrian area, and inserting them into the scene map; obtaining the number of passage paths for each induction door, determining the resource allocation according to the number, and adjusting the resource input amount of each induction door. The present invention constructs a three-dimensional model based on building information, and then simulates multiple paths. The resource allocation scheme is determined according to the number of passage paths for each induction door, and then the limited resources are allocated, which greatly improves the flexibility, so that the induction door with more people passing through has a larger sensing distance and a higher response speed.

The utility model relates to a capacitive proximity induction automobile sliding door controller, which is used for starting and stopping an automobile sliding door, and comprises a shell and a PCB (Printed Circuit Board) arranged in the shell, the PCB is provided with a capacitor with a fixed numerical value, a sensor and a micro control unit (MCU) for proximity induction, a signal indicator is correspondingly arranged above the sensor, and the signal indicator is connected with the shell. Through precise cooperation of the copper foil sensor, the capacitor with the fixed numerical value and the MCU, external human body gestures can be sensitively sensed, the intelligent starting and stopping function of the sliding door is achieved, meanwhile, the LED indicator lamp serves as a signal indicator, a user can visually know the working state of the sensing device, the LED indicator lamp has four different working states, and the intelligent starting and stopping function of the sliding door is achieved. Therefore, the user can quickly know the current condition of the system, and the operation judgment of opening and closing the door is facilitated.

The present application provides a calibration method and electronic equipment, which relate to the field of communication technology. The electronic equipment includes: an antenna; an electromagnetic wave absorption ratio (SAR) sensor, the SAR sensor includes a first terminal and a second terminal, the first terminal is connected to the antenna; a scroll screen, the scroll screen includes a metal frame; wherein, when the scroll screen is in a folded state, the metal frame is connected to the second terminal; when the scroll screen is in an unfolded state, the metal frame is connected to the antenna, or the metal frame is connected to the second terminal.

An optical device (1) for controlling light from an external light source (2), comprising: at least a first and a second waveguide (3, 4) for guiding a light beam emitted from the external light source (2); and at least a first beam shaping structure (5) having a first light emitting area (6) for emitting the light beam, and a second beam shaping structure (7) having a second light emitting area (6) for emitting the light beam, wherein the first waveguide (3) guides the light beam emitted from the external light source (2) to the first beam shaping structure (5), and the second waveguide (4) guides the light beam emitted from the external light source (2) to the second beam shaping structure (7); wherein the first and second beam shaping structures (5, 7) are both configured such that the uniformity of the radiation density profile of the light beam emitted from the corresponding light emitting area (6, 8) of the corresponding beam shaping structure (5, 7) is higher than the uniformity of the radiation density profile of the light beam guided by the corresponding waveguide (3, 4) to the corresponding beam shaping structure (5, 7). A backlight unit (22) comprising such an optical device (1); and an optical system, in particular a holographic display, comprising such a backlight unit (22) and a spatial light modulator (17).

The induction device comprises an induction module and an amplification module, the induction module is used for emitting a first induction signal to induce information in a first area, and the amplification module is used for switching the first induction signal from induction of the first area to induction of a second area. The distance between the second area and the signal transmitting device of the sensing module is larger than the distance between the first area and the signal transmitting device, so that the sensing distance of an existing sensing device is prolonged under the condition that the dielectric constant is not adjusted, the bad conditions of too sensitive sensing, crash and the like caused by adjustment of the dielectric constant are solved, and the service life of the sensing device is prolonged. And the induction distance increased by the amplification module is greater than the induction distance increased by adjusting the dielectric constant. The induction device is further provided with an indicating lamp, the indicating lamp is projected to the ground to form a light spot with the area not larger than that of the induction area, and the induction module can be activated by guiding a user to put feet into the light spot area.

The invention belongs to the technical field of automobile safety, and discloses a transportation limiting protection device which comprises a protection base, one side of the protection base is fixedly connected with a U-shaped mounting plate, and one side of the interior of the protection base is fixedly connected with two first driving motors. A first driving motor is started to drive a first rotating shaft to rotate, the first rotating shaft rotates to drive a worm to rotate, the worm rotates to drive a worm gear to rotate, the worm gear rotates to drive a second rotating shaft to rotate, and the second rotating shaft rotates to drive a position adjusting plate to rotate, so that the truck is adjusted, and the truck can rotate by a certain angle; therefore, low efficiency caused by the fact that a truck cannot reach a specified battery replacement position due to insufficient experience of a driver can be avoided, the battery replacement speed is increased, the battery replacement efficiency is improved, and meanwhile, the situation that the use performance and the service life of the battery are affected due to the fact that a clamping hook for hooking the battery collides with the battery is avoided.

The utility model belongs to the technical field of winding machines, and particularly relates to a winding machine winding avoiding clamping hand mechanism which comprises a machine body, a controller, a linear moving assembly and a mother rope drag hook are installed on the machine body, a sliding base in the linear moving assembly is connected with one end of an installation frame, and a safety avoiding assembly is installed at the other end of the installation frame. A rotary winding assembly is installed on the portion, between the linear moving assembly and the safety avoiding assembly, of the installation frame and comprises a pay-off reel, a belt transmission mechanism and a rotary frame, the safety avoiding assembly comprises a top plate, the top plate is connected with one end of a vertical plate, an induction antenna is installed on the vertical plate, and the induction antenna is electrically connected with a human body induction module. The human body induction module is electrically connected with the controller. The safety avoiding assembly located on the front side of the rotating winding assembly can sense and recognize the human body in time, a motor and a driving motor in the linear moving assembly are controlled to stop rotating in time before the limbs of the human body enter the rotating range of the rotating winding assembly, and the rotating winding assembly is prevented from impacting the limbs of people.

The invention discloses an OPGW optical cable long-distance vibration monitoring system based on Φ-OTDR technology. The system modulates a continuous optical signal output by a narrow linewidth laser into an optical pulse signal through a semiconductor optical amplifier, and modulates it into a narrower pulse optical signal by an acousto-optic modulator. The narrow pulse optical signal is amplified by an erbium-doped fiber amplifier and then injected into a wavelength division multiplexer and an output optical signal of a Raman amplifier through a first circulator. The Raman amplifier distributes and amplifies the optical signal in the optical fiber to be tested, thereby improving the sensing distance of the system. At the same time, a remote pump is provided for the erbium-doped fiber to realize remote pump amplification, thereby further improving the sensing distance of the system. The backward Rayleigh scattered optical signal is amplified by a second erbium-doped fiber amplifier, and then ASE noise is filtered out by an optical filter, and then detected and collected by a photoelectric detector and a data acquisition card. The system can be used for long-distance monitoring of OPGW optical cables.

The invention relates to the technical field of distributed optical fiber sensing, and discloses a Raman optical fiber sensing device for pipeline leakage chaos time frequency comb correlation detection, which comprises an FP semiconductor laser, the output end of the FP semiconductor laser is connected with a polarization controller, the polarization controller is connected with a first port of a first optical coupler, and the first optical coupler is connected with a second port of a second optical coupler. A second port of the first optical coupler is connected with a second port of the circulator through the optical attenuator, a first port of the circulator is connected with the tunable Bragg grating, and a third port of the circulator is connected with a third port of the second optical coupler; a first port of the second optical coupler is connected with a third port of the first optical coupler through the erbium-doped optical fiber amplifier, a second port of the second optical coupler is connected with an input end of the semiconductor optical modulator, and the semiconductor optical modulator is connected with the pulse comb generator. The output end of the semiconductor optical modulator is connected with the input end of a third optical coupler, the first output end of the third optical coupler is connected with the input end of a first photoelectric detector, and the output end of the first photoelectric detector is connected with a computer through an acquisition card.

This invention discloses a hybrid direct and coherent seismic exploration system and method. It employs multi-frequency time-delay dual-pulse direct detection to acquire the detection signal, and then uses moving average differential detection to determine the vibration location. Heterodyne coherent detection acquires multi-frequency optical pulse electrical signals, which are then bandpass filtered. The resulting signals of multiple different frequencies are then subjected to I / Q quadrature demodulation. Phase reconstruction is performed based on the phase curves at the determined vibration location to obtain the final vibration phase curve. By using a direct detection structure to initially determine the vibration location, and a coherent detection structure to directly reconstruct the vibration curve based on the obtained location, the detection efficiency is improved. This also enhances the signal-to-noise ratio and sensing distance of the distributed fiber optic vibration sensing system.

The utility model discloses a ship lock miter gate waterproof absolute opening on -line monitoring device, the utility model relates to gate absolute opening monitoring technical field. The ship lock miter gate waterproof absolute opening on -line monitoring device, including moving ruler, static magnetic pointer and miter gate, moving ruler includes arc slot, magnetism plate and PCB array, and PCB array sets up in the inside of arc slot, and magnetism plate sets up in the lower surface of arc slot, and PCB array includes PCB board, and the outer surface of PCB board is provided with hall device array and controller, and static magnetic pointer includes support, angle code and permanent magnet, and angle code is symmetrically arranged in the both sides of permanent magnet, the utility model discloses non -contact means, installs the sensor on the gate, and the absolute opening information of gate is obtained through the method of direct monitoring.