146results about How to "Increase sensing distance" patented technology

A mobile terminal includes a sensing device that uses a proximity sensor. The sensing device includes: a proximity sensor sensing approach of an external object; and a lens unit installed on top of the proximity sensor. The lens unit includes: a lens body having a first through-opening through which light emitted from a light emitting unit of the proximity sensor passes and a second through-opening through which light, reflected from the external object and entering into a light receiving unit of the proximity sensor, passes; and a reflective film formed in the lens body to surround edges of the first through-opening and the second through-opening. The lens body and the reflective film are integrated with each other by double injection molding. The lens body and the reflecting film are manufactured in a single body by double injection molding.

The invention discloses an optical fiber distributed disturbance sensor which comprises an optical fiber laser, a bidirectional distributed Raman amplification unit and a photoelectric detection and signal processing unit, wherein an output end of the optical fiber laser is connected with a first coupler; two output ends of the first coupler are respectively connected with an acoustic optical modulator and a third coupler; the bidirectional distributed Raman amplification unit is connected with the acoustic optical modulator by a first circulator and is connected with the third coupler by the first circulator; the photoelectric detection and signal processing unit is connected with the third coupler and used for receiving an interference-enhanced optical signal in the third coupler, converting the optical signal into an electric signal and carrying out subsequent data processing. In the optical fiber distributed disturbance sensor, the back scattering light intensity and the signal-to-noise ratio of the tail end of the optical fiber can be improved by the bidirectional distributed Raman amplification structure so as to improve the sensing distance of the optical fiber distributed disturbance sensor; and the light power received by a detector can be improved through the interference of a part of continuous light output by a light source and the back scattering light, so as to improve the signal-to-noise ratio of the system. The sensor is a combination of conventional photoelectric devices, has a simple structure and is easy to realize.

Metal face inductive proximity sensors and methods are presented for sensing the presence or absence of a target object in a target sensing area in which a coil system is operated to generate a magnetic field extending outward from the sensing face at a frequency in a range that maximizes a relative target effect for the sensing face area, material, and thickness, and a target material from which the target object is made to allow the protective advantages of metal sensing face materials while enhancing sensing distance by optimizing the ratio of the target energy loss to the energy loss in the metal face.

The invention discloses a tunnel back reflection illuminating system setting method based on train speed control and train distance keeping. The method comprises the steps of: arranging tunnel side walls, red and white facade marked lines on lower edges of curbs, and road surface raised pavement markers on road sides to form a space high-frequency vision information stream; secondly, arranging a plurality of layers of outline markers on the tunnel side walls at intervals of 25-50m in an advancing direction, arranging side wall vertical marked lines and extending to the top of a cave, transversely arranging transverse wrong vision marked lines on the road surface to form a space medium-frequency vision information stream; and then arranging two white folded lines and vibration marked lines on the road surface every 3 medium-frequency transverse marked lines at intervals of 100-200m in the advancing direction, and arranging two white folded lines on the side walls to form a space low-frequency vision information stream. Multiple channels of frequency vision systems are made of a high-strength back reflection material, so that a back reflection illuminating system is formed, perception of velocity and perception of distance of a driver are effectively improved, thus the integration of tunnel illuminating benefit and tunnel safety is achieved. The tunnel back reflection illuminating system setting method can be applied to tunnel illumination of low-light expressways with speed limit of 60-80km / h and traffic safety facility improvement.

The invention discloses a low-cost mountainous-area expressway tunnel entrance vehicle speed control facility designing method which comprises the following steps of: setting red-and-white mark lines and road-side road surface and in-road lane line raised road signs on the side wall of the tunnel entrance, the lower edge of curb and the plane of the overhauling way at a space of 1.5-3m to form a high-frequency vision information flow; setting intermediate-frequency information at the tunnel entrance in the advancing direction every 20-30m, setting 3 layers of delineators on each side wall of the tunnel from top to bottom, setting a side wall vertical mark line and 2 side wall white broken lines, and setting a transverse staggered vision mark line and 2 white broken lines on the road surface to form an intermediate-frequency vision information flow; and forming a retroreflection illumination system from the retroreflecting materials by use of the high and intermediate-frequency vision information. Road-side road surface raised road signs and transverse deceleration mark lines (consisting of transverse vibration mark lines and transverse staggered vision mark lines) are arranged in front of the tunnel entrance, and the longitudinal space of the transverse deceleration mark lines turns smaller at first and then becomes stable to form a tunnel pre-deceleration system. The retroreflection illumination system and the deceleration system form the tunnel entrance vehicle speed control facility which realizes reasonable transition of the vehicle speed at the tunnel entrance and is suitable for the mountainous-area expressway tunnel entrance with the speed limit of 60-80km / h.

The invention discloses a Brillouin optical time domain reflectometer for single-photon detection based on an edged filter method, which comprises a narrow linewidth laser (1), a pulse modulator (2), a circulator (3), a sensing optical fiber (4), an optical fiber module (5), 3dB coupler (6), a linear edged filter (7), an InGaAs / InP SPAD (single-photon avalanche diode) detector group (8), a signal generator (9), a data processing module (10) and a pulse signal generator (11), wherein the InGaAs / InP SPAD detector group (8) includes two or three InGaAs / InP SPAD detectors. The InGaAs / InP SPAD detector group with a high counting rate and high sensitivity is used as a detection unit, Brillouin frequency shift information is acquired by the edged filter method, time correlation single-photon counting technology is adopted by the data processing module (10), limitations on the bandwidth and sensitivity of a traditional detector are broken through, spatial resolution and measuring precision of the reflectometer can be simultaneously improved, and temperature and strain are simultaneously sensed.

The invention relates to a distributed optical fiber sensing system, and specifically relates to a sub-millimeter spatial resolution distributed optical fiber sensing device and method. According to the invention, the problems of unavailable spatial resolution and sensing distance combination, seriously limited sensing distance and low spatial resolution of the existing distributed optical fiber sensing system are solved. The sub-millimeter spatial resolution distributed optical fiber sensing device comprises a chaos laser, a 1*2 optical fiber coupler, a high-speed electro-optic modulator, a microwave signal source, a first optical amplifier, an optical isolator, an optical scrambler, an variable optical delay line, a low-speed electro-optic modulator, a second optical amplifier, an optical circulator, a sensing optical fiber, a photodetector, a phase-lock amplifier, a signal generator, a data acquisition card and a computer. The device and the method, which are provided by the invention, are applicable to the field of distributed optical fiber sensing.

The invention relates to a dual view-field dynamic-trajectory reverse image system, which is characterized by comprising a wide angle reverse camera, a steering wheel turning angle sensor, a reverse image control system and a display, wherein the reverse image control system is used for acquiring vehicle gears, the steering wheel turning angle and driver reverse image view-field selection information; the reverse image control system is used for controlling the wide angle camera to acquire vehicle rear images and to respectively send the images to a reverse trajectory projection unit and a reverse image overlook conversion unit; a reverse trajectory calculation unit is used for acquiring the steel wheel turning angle, calculating a reverse trajectory and a distance mark line, and sending them to the reverse trajectory projection unit; the reverse trajectory projection unit is used for projecting the reverse trajectory line and the distance mark line to the images, and sending the images overlapped with the reverse trajectory line and the distance mark line to the display; and the reverse image overlook conversion unit is used for converting the vehicle rear images into overlook images, projecting the reverse trajectory and the distance mark line to the overlook images, and sending to the display. The dual view-field dynamic-trajectory reverse image system provided by the invention can be widely applied to providing more accurate reference information for drivers in the vehicle reverse process.

The invention applies to a distributed fiber sensing monitoring system, and specifically relates to a chaotic Brillouin light time domain / coherence domain fusion analytical equipment and method; the equipment comprises a chaotic laser, a first optical isolator, a 1*2 fiber coupler, a first fiber polarization controller, a first high speed electric light modulator, a microwave signal source, a fiber grating, a first light circulator, a second fiber polarization controller, a second high speed electric light modulator, a pulse generator, a light scrambler, a light amplifier, a second optical isolator, a sensing fiber, a second light circulator, a tunable light filter, and an optical power detector; the equipment combines the advantages of an existing BOCDA system and a BOTDA system; the conventional BOTDA system spatial resolution is limited; the conventional BOCDA system uses continuous light as a detection signal, so the sensing distance has fuzzy distance problems, wherein the continuous light frequency is modulated by the sine or the continuous light phase is modulated by the pseudo random sequence; the long distance and high spatial resolution of the conventional distributed sensing system cannot be fully considered; the chaotic Brillouin light time domain / coherence domain fusion analytical equipment and method can solve said problems.

The invention provides a method for sensing an optical fiber in long distance based on self-correlation characteristics of a Hadamard matrix. The method comprises the following steps that row vectors of matrixes are used as code words for detecting pulse codes; the row vectors of a matrix A and a matrix B are respectively used as train pulse of the code words to be inputted into the optical fiber, and a returned Brillouin signal is correlated with continuous light outputted by a laser; coherent signals are acquired by a spectroanalyzer so as to acquire signal power distribution under a frequency point, and acquired results are subtracted; the row vector Hi of the Hadamard matrix is correlated with a corresponding scattered signal, and then, after the correlated results are summed, the correlated results are divided by n to acquire scattered light power acquired when equivalent individual pulse is inputted into the optical fiber; the steps are repeated on each required frequency point; Brillouin power spectrum consisting of the scattered points corresponding to each moment is acquired; and the method performs sensing by a corresponding relation of center frequency, peak power and full width at half maximum of the power spectrum and temperature and stress.

The invention relates to an urban river-crossing bridge traffic landscape design method based on multi-frequency color information. Yellow and black or blue and white lamp pole facade marking lines are arranged on the lower edges of two sides of lamp poles, at the interval of 25 m to 35 m, of a bridge; transverse visual illusion marking lines are arranged at the positions, corresponding to the yellow and black or blue and white lamp pole facade marking lines, of the road surface; road surface protruding road marks are arranged at the interval of 12.5 m to 17.5 m, and therefore the space intermediate frequency visual information flow is jointly formed. Yellow and black or blue and white road side facade marking lines are arranged on the lower edge and the top of curb stone at intervals of 1.5 m to 3 m, and therefore the space high frequency visual information flow is formed; a set of road surface transverse white folding lines is arranged every four lamp poles in the advancing direction, and yellow or blue bridge handrails are arranged on the road side, so that the space low-frequency visual information flow is formed. The multi-frequency color information flow can effectively improve the speed perception, the distance perception and the visual sensitivity under high and low illuminance of a driver in the vehicle driving process, and unification of urban river-crossing bridge traffic landscape coordination and vehicle driving safety is achieved.

The invention discloses a control method and device for a dustbin and the dustbin. The control method includes the steps of sensing whether an obstacle exists within the sensing range of the dustbin or not, opening the dustbin when sensing the obstacle, increasing the sensing distance and carrying out sensing again to sense whether the obstacle exists within the increased sensing range of the dustbin or not. By means of the scheme, the defects of large energy consumption, poor reliability, poor user experience and the like in the prior art can be overcome, and the beneficial effects of small energy consumption, high reliability and good user experience are realized.

The invention relates to a luminous induction system for rural road tunnels. According to the light environment characteristics of different sections of the tunnel, driving characteristics and visual characteristics of the driver, short tunnels are divided into short tunnels <200m and medium-short tunnels of 200-500m, and short tunnels of 200-500m are divided into: entrance section, middle section, In the exit section, multi-frequency and multi-size luminous induction facilities are set according to the characteristics of the road section; a reminder area is also set in the middle section; the high-frequency small-size induction information is set on the outside of the lane or at the maintenance road with the highest brightness, and the medium-frequency small-size induction information is set on The brightness of the side wall is lower than that of the curb induction information. The medium-scale induction information of the medium-frequency information is set on the side wall, and the low-frequency large-scale induction information is set on the side wall and extends to the top of the tunnel. Taking into account both safety and energy saving, while avoiding optical illusions and ensuring safety, it is especially suitable for short rural road tunnels (<500m) without electricity or lights.

The invention discloses a broadband chaotic laser-based distributed optical fiber dynamic strain sensing device, which comprises a broadband chaotic laser source (1), a 1*2 optical fiber coupler (2),a first polarization controller (3), a high-speed electro-optic modulator (4), a programmable optical delay generator (5), a first optical amplifier (6), an optical polarizer (7), an optical isolator(8), a sensing optical fiber (9), an optical circulator (10), a second optical amplifier (11), a semiconductor optical amplifier (12), a second polarization controller (13), a pulse signal generator (14), a broadband microwave signal source (15), a high speed data acquisition and analysis system (16), a photoelectric detector (17), and a tunable optical filter (18). The pulse signal generator is used to generate high speed pulse signals, synchronous control on the broadband microwave signal source, the semiconductor optical amplifier and the high speed data acquisition and analysis system is realized, and the measurement accuracy and the real-time performance of the sensing system are ensured.

The invention relates to an anti-dazzle principle based design method for traffic engineering facilities at a road tunnel exit. The method is characterized in that tunnel exit anti-dazzle facilities are arranged in front of the tunnel exit to ease intensive brightness transition caused by insufficient illuminating lamps at the tunnel exit; coloured painting materials of which reflection coefficients gradually reduce are arranged on the tunnel ceiling, side walls and roads from the top down to ease brightness transition and beam divergence at the tunnel exit, so as to lift the dazzle area, reduce the dazzle area below the visual line of a driver and increase the visual adaptation time; horizontal road direction lines and road lane keeping lines are arranged on the road, and side wall vertical direction lines and side wall double-layered contour marks are arranged on the side walls, so as to form a closed mid-frequency retroreflective information stream together; high-frequency red and white marked lines arranged on maintenance road edges and road side reflective raised route markers form a high frequency visual information stream to increase the driver's instantaneous velocity sensation, and promote the driver's speed feeling and distance feeling, and accordingly, the coordination and unification of the tunnel lighting energy conservation and tunnel traffic safety are realized.

A high-sensitivity in-cell touch display device has a common voltage and sensing electrode layer including a plurality of common voltage and sensing electrodes, each corresponding to at least one pixel electrode. A touch circuit is provided with a touch-dedicated power supply circuit, and a common voltage and sensing electrode is used as a common node of the touch circuit and a display circuit, so that there is no current loop between the touch circuit and the display circuit. Reflection electrodes are further provided to reduce parasitic capacitance between the common voltage and sensing electrodes and to improve the sensing distance. The display operation and the touch sensing operation can be performed on different areas in parallel to increase respective efficiencies of the display and touch sensing operations.

The invention provides a control box, an intelligent toilet and bathroom system and a control method thereof. The control box comprises a box body, a circuit board assembly and a mounting base. The circuit board assembly is mounted in the box body and comprises a CPU module, a display screen, a sound control module, a wireless module, a gesture induction module and a human body induction module. The human body induction module is connected with the CPU module for identifying a human body approaching signal and transmitting the human body approaching signal to the CPU module, thereby making the CPU module arouse a control box. The gesture induction module is connected with the CPU module for identifying a gesture signal and transmitting the gesture signal to the CPU module, thereby making the CPU module control action of a toilet and bathroom terminal. The sound control module is connected with the CPU module for identifying a sound signal and transmitting the sound signal to the CPU module, thereby making the CPU module control action of the toilet and bathroom terminal. The wireless module is connected with the CPU module. The display screen is connected with the CPU module for displaying state information of the toilet and bathroom terminal. The control box, the intelligent toilet and bathroom system and the control method thereof have advantages of simple and easy operation, remote control for the toilet and bathroom equipment, and effective reduction of waiting time. Furthermore the control box, the intelligent toilet and bathroom system and the control method make intelligence close to life.

The invention provides an ultra-long distance distributed optical sensing device based on two-way optical amplification. The device comprises a controlling and processing device, a broadband laser device (1) and a first optical fiber coupler (2), parallel first optical fiber arm (3) and second optical fiber arm (4), a second optical fiber coupler (6), a sensing link (7) and a faraday rotation mirror (8), all of which are orderly connected together; a photoelectric detector (20) is further connected between the controlling and processing device and the first optical fiber coupler (2). The ultra-long distance distributed optical sensing device is long in sensing distance, relatively high in accuracy and good in positioning effect.

The invention discloses a sensing multiplexing system based on a non-equidistant weak Bragg reflection fiber Bragg grating array. The system comprises a tunable laser (T), a modulator (E), an optical isolator (I), an optical circulator (C) and a wavelength demodulation device (D) which are connected in turn, wherein the optical circulator (C) is connected to a sensing optical fiber with a plurality of fiber Bragg gratings. The interference effect caused by multiple reflection among the fiber Bragg gratings can be avoided, the multiplexing capacity of the system can be greatly improved, and long-distance high-density high-capacity distributed detection is realized.

The invention relates to a coal and rock identification method based on laser scanning. The reflectivity of the coal surface to scanning laser beams from different distances and the reflectivity of the rock surface to scanning laser beams from different distances are measured through the laser scanning technology respectively, and the three-dimensional morphology information of the surfaces of a coal sample and a rock sample scanned by lasers is acquired in real time; the changing relation between the distance and the reflectivity of laser scanning of standard coal and standard rock is established, and reflectivity correction coefficients corresponding to different surface three-dimensional morphologies of the standard coal and the standard rock from different distances are determined; a characteristic database for the distance and reflectivity of laser scanning corresponding to the standard coal and the standard rock with different surface three-dimensional morphologies is established, while on-site coal and rock objects are identified, the actually measured characteristic values of the surfaces of the coal and rock objects are compared with the coal and rock standard characteristic data measured earlier, and thus the coal and rock type can be identified fast in real time. The method has the advantages of being simple, high in calculation speed, automation degree and accuracy rate and suitable for identifying the coal and rock types in complex environments.

The invention provides an NFC antenna and a mobile terminal. The NFC antenna is provided with first and second NFC antenna branches, the coiling direction of the first NFC antenna branch is opposite to that of the second NFC antenna branch, the first NFC antenna branch is arranged on a metal backshell of a first terminal, the second first NFC antenna branch is arranged on a nonmetal backshell of a second terminal, a first hole is formed in the metal backshell of the first terminal, the first NFC antenna branch is arranged around the first hole, so that the direction of a magnetic field generated in the surrounding of the first hole is the same with that of a magnetic field of the second NFC antenna branch, the magnetic field generated by the second NFC antenna branch is overlapped positively, and thus, the induction distance of the NFC antenna is improved, shielding for a magnetic field of the NFC antenna by the metal backshell of the first terminal is weakened, and the problem that gaps need to be formed in the backshells of the terminals is solved.

The invention relates to an optical fiber sensing technology and provides a method and device for phase noise suppression of a remote optical fiber interference system in spectral line operation. The device comprises a narrow linewidth single frequency laser, a first electro-optic phase modulator, an erbium-doped optical fiber amplifier, a transmission optical fiber, a second electro-optic phase modulator, an optical fiber Michelson interferometer, a photoelectric detector and a signal collecting and processing device. The method comprises the steps of applying modulating signals at the input end of the transmission optical fiber through the electro-optic phase modulators to generate multifrequency laser, utilizing the modulating signals of the electro-optic phase modulators again at the output end of the transmission optical fiber to recover the multifrequency laser generated by modulation to single frequency laser, simultaneously enabling phase difference between the two modulating signals to be odd number times of pi, and enabling the two modulating signals to have identical frequency and amplitude. The two electro-optic phase modulators are utilized to achieve recoverable spectral line operation, an SBS is suppressed, system phase noises are reduced, and accordingly maximum input power and the sensing distance of a sensing system are improved.

The invention discloses a double-core FBG (fiber bragg grating) array sensing network. The output end of a scanning laser is connected with a semiconductor amplifier, and the output end of the semiconductor amplifier is connected with an optical circulator. An optical connector is connected with the optical circulator, and the optical circulator is connected a first FBG array and a second FBG array in a double-core FBG array. The optical circulator is connected with the input end of a photoelectric detector, and the output end of the photoelectric detector is connected with a grid wavelength detection electric signal input end of a demodulator. A semiconductor light amplification drive signal output end of a pulse function generator is connected with a drive signal input end of the photoelectric detector. A demodulation control signal output end of the pulse function generator is connected with the demodulation control signal input end of the demodulator. A pulse function generator drive signal output end of the demodulator is connected with a drive signal input end of the pulse function generator. The network is high in stability, is low in loss, and has no temperature interference.

The invention discloses an enhanced hydrophone detection device based on a low-bending-loss chirped grating array optical fiber. The device comprises an interference type distributed fiber bragg grating acoustic sensing demodulator, a low-bending-loss chirped grating array optical fiber and a metal elastic cylinder. The low-bending-loss chirped grating array optical fiber is prepared on line basedon a low-bending-loss insensitive single-mode optical fiber. Optical fibers between every two adjacent chirped gratings in the low-bending-loss chirped grating array optical fiber form grating measuring areas. The grating measuring areas comprise the odd chirped grating measuring areas and the even chirped grating measuring areas. The odd chirped grating measuring areas are wound on the metal elastic cylinder, and the even chirped grating measuring areas are linearly distributed in the length direction of the metal elastic cylinder. The optical signal output end of the interference type distributed fiber bragg grating acoustic sensing demodulator is connected with one end of the low-bending-loss chirped grating array optical fiber, and the other end of the low-bending-loss chirped gratingarray optical fiber is knotted and suspended or connected with the optical fiber terminator.

The invention discloses a capacitive sensing-based display screen gesture control circuit and method. The circuit comprises a display screen and sensors arranged around the display; the sensors are arranged in a strip shape; a shielding layer is arranged at the periphery of each sensor; multiple sensors output sensing signals to a detection circuit; the grounded end of the display screen is disconnected with the ground; and the grounded end of the display screen, the sensors and the shielding layers are all connected to a shock signal source. The method comprises the steps of detecting the signals output by the sensors through the detection circuit, and determining the sensors which work currently; loading voltage signals of shock to the sensors which do not work, thereby enabling the voltage signals loaded to the sensors which do not work and the sensors which work to keep synchronous shock; and detecting the signals output by the sensors which work currently through the detection circuit, and according to the changes of the signals output by the sensors which work currently, determining gestures. The changes of the user gestures can be accurately detected; and the production costis relatively low.

The invention discloses a continuous highway downslope section vision speed control method and system. The method comprises the following steps that firstly, a continuous downslope warning sign is arranged on the edge of a road at a continuous highway downslope section and at a first section in front of a grade change point in the downslope direction, and concrete isolation piles are arranged every a first preset distance to form a space high-frequency information stream; secondly, raised pavement marks are arranged every a second preset distance at the first section in front of the grade change point in the downslope direction and the second section behind the grade change point to form a space low-frequency information stream; thirdly, a plurality of visual illusion marking lines are laid at the sections from the grade change point in the upslope direction; and a plurality of visual illusion marking lines are laid at equal intervals within the preset range from the grade change point in the downslope direction. According to the continuous highway downslope section vision speed control method and system, the gradient illusion of the continuous highway downslope section of a driver can be avoided, the control over the vehicle speed of the downslope section is facilitated, and traffic safety is improved.

The invention discloses a method for improving the signal to noise ratio of a BOTDA system based on a CCPONS and Walsh combined pulse code, and belongs to the field of distributed fiber sensing. A laser, a coupler, a first electro-optic modulator, a microwave signal source, a DC power supply, a first erbium doped fiber amplifier, an isolator, a second electro-optic modulator, a second first erbiumdoped fiber amplifier, a pulse signal generator, a circulator, a sensing fiber, a photoelectric detector, a data collection card and a computer. CCPONS coding is combined with Walsh coding, the signal to noise ratio of the system is improved greatly under the limited coding length, and thus, the measuring precision is improved.