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.

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 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 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 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.

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 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 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 a display screen gesture control circuit and method based on capacitive sensing. The circuit includes a display screen and sensors arranged around the display screen. The sensors are arranged in strips, and a shielding layer is provided around each sensor. Multiple sensors output sensing signals to the detection circuit; the ground terminal of the display screen is disconnected from the ground, and the ground terminal of the display screen, the sensor and the shielding layer are all connected to the oscillating signal source. The method comprises the detection circuit detecting the signal output by the sensor, and determining the current working sensor; loading an oscillating voltage signal to the non-working sensor, so that the non-working sensor and the current working sensor are loaded with the voltage signal Synchronous oscillation; the detection circuit detects the signal output by the currently working sensor, and determines the gesture according to the change of the signal output by the currently working sensor. The invention can accurately detect the change of the gesture of the user, and the production cost is 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.