311results about How to "Simple system structure" patented technology

The invention relates to a campus classroom attendance checking-in system and a method for realizing attendance checking-in by using the system. The system comprises student mobile terminals, a class AP (Access Point), a class mobile terminal, a class server and a background server. The system is characterized in that the student mobile terminals and the class mobile terminal are connected through the class AP and the class server; and the class server is connected with the background server through the class AP. The campus classroom attendance checking-in system provided by the invention can be used for realizing the attendance checking-in of students by means of matching the student mobile terminals and the class mobile terminal with the server. According to the system and the method provided by the invention, the problems of low roll-call efficiency and low classroom scoring efficiency in the conventional university teaching can be overcome. The campus classroom attendance checking-in system has good practical values.

The present invention provides an online gas-solid two-phase detection method for coal characteristics based on laser induction, and an apparatus thereof. The apparatus comprises a sampling pipe, a coal powder conveying pipe, a cyclone separator, a coal powder falling pipe, a measurement room and a spectrum detection system. The detection method comprises that: the coal powder is subjected to continuous sampling at a proper position on an air-powder pipeline by the sampling pipe, wherein the air-powder pipeline is arranged between a coal mill outlet and a burner inlet; a cycle process of sampling, measuring and returning of the coal powder is realized with the effect of compressed air. According to the present invention, with adopting the measurement system of the measurement method, the taken gas-solid two-phase coal powder particles can be subjected to laser detection only after the simple gas-solid separation by the cyclone separator, and the sample preparing is not required; the gas conveying manner is adopted, and the mechanical transmission apparatus is not used so as to contribute to long term and reliable operation of the whole apparatus in the field environment, and really realize the online detection of the coal characteristics.

The invention discloses an image spectrum detection method and system. The system comprises an imaging lens set, a DMD, imaging lenses, an area array CCD camera, a convergent lens set, an optical fiber coupler, an optical fiber, a fiber optical spectrometer and a processor. Both the CCD camera and the fiber optical spectrometer are connected to the processor. A micromirror in a micromirror device has the opening state and the closed state. Incident image signals transmit the imaging lens set to form incident light signals and then enter the micromirror device. When the micromirror in the micromirror device is in the closed state, reflecting light signals are imaged to the surface of the CCD camera through the imaging lenses; when the micromirror in the micromirror device is in the opening state, the light signals are reflected to the convergent lens set, converged to the optical fiber coupler, coupled to the optical fiber, and transmitted to the fiber optical spectrometer for spectrum measurement. The image spectrum detection system can be provided with any fiber optical spectrometer, broadband spectrum measurement is achieved, and the spectral resolution can be increased to 0.0001 order of magnitude through the image spectrum detection system according to the technical parameters of an existing commercial fiber optical spectrometer.

An intelligent control method for platform screen doors is provided, which belongs to the field of automatic control technology. In the method, firstly the images of platform in train pull-in and pull-off states are collected by a CMOS camera and then outputted to a signal processor, the signal processor extracts feature information of the images and produces two basic templates and simultaneously establishes equations and indices for determining image threshold grey level of field image and basic template and error and correlation therebetween; then the filed images are collected by the CMOS camera and outputted to the signal processor, the signal processor processes and identifies the filed images and then produces an accurate control command and outputs the command to a controller; and finally the controller converts the received digital control command to an analog control command and the outputs to a driver, and the driver drives a servomechanism of the screen door after the amplification of the analog control command. The invention has high operational reliability and high identification accuracy, and can ensure the comfort and safety of pick-up and drop-off for passengers.

The embodiment of the invention discloses a laser radar system. The laser radar system comprises a light source module, a modulation light module, a transmitting-receiving module, a detection module and a signal processing module, wherein double-wavelength laser beams are subjected to linear modulation through a modulation light module and are converted into double-frequency linear frequency modulation continuous wave laser beams; one laser beam is used as a local oscillation light beam and the other laser beam is used as signal light which has mutual effect with a detection target; the signal light scatters an echo signal through the detection target; the local oscillation light beam and the echo signal are subjected to coherent beat frequency, so as to obtain double-wavelength Doppler frequency shift difference value information. The laser radar system disclosed by the invention adopts double-wavelength linear frequency modulation laser so that influences, caused by non-linear linear frequency modulation and an atmospheric turbulence effect, on a speed measuring resolution ratio are extremely reduced; distance measurement and speed measurement are carried out on the detection target at the same time; the laser radar system has the advantages of high detection precision, electromagnetic interference resistance, no distance dead zones and the like.

The invention relates to a load frequency response test system of a hydraulic cylinder and a test method thereof. The technical scheme of the system is as follows: the oil outlet of an oil pump (9) is communicated with the port P of an electro hydraulic servovalve (13), wherein, the opening A or the port B of the electro hydraulic servovalve (13) is communicated with the rodless chamber of a hydraulic cylinder (2) to be tested, and the rod chamber of the hydraulic cylinder (2) to be tested is communicated with an oil tank (11); the hydraulic cylinder (2) to be tested is installed in a closed stander (1); a displacement sensor (3) is installed on the hydraulic cylinder (2) to be tested and is electrically connected with the A/D port of a data collecting card (5) and a PID controller (6); and one end of a servoamplifier (7) is electrically connected with an electromagnet of the electro hydraulic servovalve (13), the other end of the servoamplifier (7) is electrically connected with one end of the PID controller (6), the other end of the PID controller (6) is electrically connected with the D/A port of the data collecting card (5), and the data collecting card (5) and computer-aided test software (4) are installed in a computer. The load frequency response test system has the advantages of simple systematic structure, accurate test and high degree of automation.

The invention discloses a device and method of a microwave photon channelized receiver of zero intermediate frequency. As shown in the drawings, the device comprises a laser diode (LD), two local oscillator signals (LO1, LO2), a DP-QPSK modulator, an optical band-pass filter (OBPF), a single polarization modulator (MZM), a splitter, a narrowband OBPF group, a polarization controller (PC), a polarization beam splitter (PBS), a balance detector (BPD) and a multi-channel ADC. The DP-QPSK modulator generates polarization multiplexing signals of an optical frequency comb and positive and negative second-order sidebands, a radio frequency (RF) signal modulates the positive and negative second-order sidebands, a generated lower sideband is within a spectral line of the optical frequency comb, and the narrowband OBPF group performs balance detection after channel division and performs demodulation to obtain IQ data. DC bias and even distortion are suppressed by the balance detection, and the IQ amplitude and the phase balance can be finely corrected by optical power and a polarization state.

The invention discloses a simple method for detecting the phase sequence of three-phase industrial-frequency alternating current and a detection device. In the invention, the zero-crossing rising edges of the three-phase voltage are respectively sampled, measured at a single point and compared by using the principle of phase time difference of the three-phase industrial-frequency alternating current, and the phase sequence and phase position of the three-phase industrial-frequency alternating current are judged by calculating the phase time difference. The method comprises the following steps: measuring the voltage rise zero-crossing point of any phase (defined as A) of the three-phase alternating current, and starting to calculate time with a clock by using the rising edge zero-crossing point of the Phase A as the reference point; then sequentially measuring the voltage rise zero-crossing points of the other two phases, and measuring the time differences T1 and T2 between the phase position rise zero-crossing point and the reference point of each of the two phases; and judging Phase B and Phase C through calculation. The method can measure three-phase industrial-frequency alternating current. The integrated multifunctional detection device has the advantages of miniaturization, systematization, simple structure and small calculated quantity, and can reduce the labor intensity of electrical installation and maintenance personnel.

The invention discloses an automatic acquisition system of baggage appearance information based on monocular vision and a method thereof. The system mainly comprises a loading platform, a color camera, a lighting device, an image processing module and a server, wherein the loading platform comprises a horizontal calibration board, a vertical calibration board and a mounting platform. The method comprises the following steps: segmenting a baggage area from a baggage image to obtain projection of a baggage on the horizontal calibration board and the vertical calibration board, so as to calculate the length, width and height of the baggage; and transforming color space of the baggage image to extract main color features of the baggage, and categorizing the main color features to obtain information on the color of the baggage. In addition, the method also comprises extraction and categorization of texture features of the baggage to obtain texture information of the baggage. Due to the automatic extraction of information on the size, color and texture of the baggage through computer vision and image processing, the invention can realize the automatic acquisition of the baggage appearance information, and is particularly suitable for acquisition of baggage information in accidents in small airports, railway stations, bus stops and the like.

The invention provides a tomographic method and a system for coherent optics in complex spectrum frequency domain, comprising a broadband light source, a light source coupling mechanism, a combined interferometer, a fiber-optics imaging probe, a spectrograph, a temperature controller and a computer; the method comprises the following steps of: firstly, measuring three groups of interference spectrum in state of three different phases of reference light; secondly, calculating two groups of differential interference spectrums; thirdly, taking the sum and the remainder of the two groups of differential interference spectrums as a real part and an imaginary part for a complex amplitude so as to reconstruct the interference spectrum of the complex amplitude in a wave number space; finally, making an inverse Fourier transform for the interference spectrum of the complex amplitude and obtaining depth-scanning information of a measured sample along an optical axis, that is chromatogram. Under the condition that a regulating device for the phase of the reference light is not used, the tomographic method and the system eliminate the effect for chromatogram quality caused by a parasitic image and a hetero conjugation image, and can realize the tomography which reflects the real structure of the measured sample with the advantages of simple system structure, wide dynamic scope and deep measurement in full scale.

The invention provides a law enforcement and evidence taking system for car horning. The system is composed of a sonar system and a high-definition camera. The sonar system is responsible for collecting sound data, calculating a spectrum characteristic, and determining whether a horn sound is an effective one based on the spectrum characteristic; and if the horn sound is an effective one, the high-definition camera is triggered to capture a car image, licence plate information is identified, and car horning feature audio frequency information is recorded. Meanwhile, the sonar system calculates sound field data, draws a sound field graph, and provides a horn sound coordinate; and the horn sound coordinate, the licence plate information, and the car horning feature audio frequency information are stored and are used as a law enforcement basis. According to the system provided by the invention, defects in the prior art are overcome; accurate and strict evidence taking of car horning can be realized and evidence can be fixed, so that the reliable basis can be provided for law enforcement and punishment. Moreover, the system has advantages of simple structure, low cost, and high reliability and is suitable for large-area popularization and application.

The invention discloses an auxiliary heating system for a liquid-metal-cooled natural circulation reactor. The auxiliary heating system comprises a nitrogen storage tank (1), a filter (2), a gas heater (3), a hot nitrogen input pipe (4), a main container (5), a safety container (6), gas extractors (7), pipelines and valves, wherein the pipelines and the valves are used for interconnecting devices. The system has the advantages that the function that a liquid-metal coolant in a liquid metal pool type reactor is subjected to auxiliary heating from the outside of the main container of the reactor is realized, the system is simple in structure, components in the reactor are not required for being added or started during operation, so that liquid metal in the main container can form micro natural circulation after the operation of the system, and meanwhile, the reliability and safety of the reactor can be effectively improved.

The invention requests a parking lot navigation system and method based on machine vision. The system is formed by a parking lot service center and a user mobile terminal on a vehicle. The parking lot service center comprises a vehicle tracking module, a data management module and a communication module, wherein the vehicle tracking module is formed by multiple groups of vision sensors which are installed in a parking lot and has an observation range which covers all passing and parking areas in the parking lot, local tracker corresponding to the vision sensors and a global tracker and is used for detecting an occupation state of each parking space and the movement state of a vehicle target of a parking lot passing area in real time. The user terminal comprises a navigation module and a communication module, the navigation module plans a vehicle driving path to carry out navigation according to a local vehicle position, free parking spaces and a parking lot real-time map from the parking lot service center received by the communication module. According to the system and the method, the intelligence of vehicle navigation in the parking lot is realized, and the parking efficiency and convenience in the parking lot are improved.

The invention discloses a device and a method for eliminating photonic microwave self-interference signals, and belongs to the technical field of microwave photonics. According to the device disclosed by the invention, useful signals received of a receiving antenna, self-interference signals and cancellation signals led out by a transmitting antenna are modulated to an optical carrier outputted by a laser by adopting an electro-optic phase modulator, a left sideband and a right side band of phase modulation optical carrier microwave signals are opposite in phase, right sideband plus optical carrier signals and left sideband plus optical carrier signals are acquired through an optical band-pass filter, and the signals are converted through a photoelectric detector so as to eliminate interference signals. The device disclosed by the invention does not need to carry out DC bias voltage control on the electro-optic phase modulator, so that the system structure is greatly simplified, and the system stability is enhanced. Amplitude and time delay regulation and control in an optical domain are great in bandwidth and high in regulation precision, and restrictions of small bandwidth and low regulation precision of an electronic technology are overcome.

The invention relates to a method and equipment for suppressing dust with dry mist. The method for suppressing dust with dry mist is characterized in that a plurality of atomizing nozzles are arranged in parallel on a disorderly discharged dust drift outlet of a dust generation point and are used for spraying the dry mist having the particle size of less than 10 Mum and making the sprayed dry mist form into a dry mist curtain to prevent the dust generated in the dust generation point from diffusing outwards to pollute the environment. The equipment for suppressing dust comprises a water supplying pipeline, an air supplying pipeline, an air compressor, an air storage tank and a control box. The air supplying pipeline, the water supplying pipeline and an electrical control pipeline which are led out of the control box are respectively connected with the air inlets, the water inlets and tracing band inlets of the atomizing nozzles which are arranged in parallel. The micro-size dry mist is sprayed to form a dry mist curtain to suppress dust. The micro-size dry mist spraying system equipment adopts the air compressor to supply compressed air, and the water and the air enter the atomizing nozzles in two branches. The micro-size dry mist spraying system equipment has simple structure, low running cost, wide application range and good dust suppression effect, consumes less water and works stably and reliably.

The invention relates to a novel optical lens measuring method which comprises the following steps: (1) establishing a lens measuring system consisting of a display and a CCD camera; (2) displaying phase shifting strips through the display, and enabling the camera to acquire strips of a display screen without a lens to be measured and with the lens to be measured in a position 1 and a position 2;(3) calculating primary phase distribution of the strips by using a four-step phase shifting method and a rhombus seed algorithm, performing system calibration through a phase without the lens to be measured, fitting a planar equation of the display screen in the two positions, calculating a rotational matrix R and a translation vector T from a screen physical coordinate system to a camera coordinate system, and further calculating the wave front slopes of the position of the lens and each point on the lens; (4) performing integration on the wave front slopes by using a Poisson reconstructionmethod so as to obtain wave front distribution of the lens to be measured; (5) calculating a spherical lens degree and astigmatic power distribution of the whole surface of the lens by using a dioptercalculation model according to the wave front distribution of the lens. By adopting the method, free-form surface lenses with relatively large curvature variations can be measured, and high resolution ratios and rapid measurement speeds can be achieved.

The invention relates to a pulse laser distance measurement system and method based on waveform time domain registration analysis. The system comprises a software part and a hardware part, wherein the software part comprises a communication software body, a waveform time domain registration analysis algorithm, a multiple echo algorithm and a distance and reflectivity algorithm. The distance measurement method includes the steps that in a control circuit, a control signal is input, and pulses are sent to a laser emitter; if the selected emitter only emits one path of lasers, the lasers are emitted to a beam splitter through a collimating mirror and divided into two beams, one path of the lasers enters a detector a through an optical attenuator, and the other path of the lasers is emitted to a target through a convex lens; if the selected emitter emits two paths of the lasers, one path of the lasers directly enters the detector a, and the other path of the lasers is emitted to the target through the convex lens; target reflection lasers are emitted to a detector b through the convex lens and an optical filter, the detector b converts laser echoes into analog signals, the two paths of analog signals are converted into digital signals on an AD converter through an analog amplification circuit respectively, waveform time domain registration analysis is conducted in an analysis module, and then the distance measurement result is output by the control circuit.

The invention relates to a hand-free tone quality testing system of an IP (internet protocol) phone terminal device, which comprises a main testing unit. Standard sound sources are stored in the main testing unit, the main testing unit is connected and disposed on to-be-tested IP phone terminal equipment in a soundproof box through netting cables and is connected with a standard loudspeaker and a standard microphone through audio cables, wherein the standard loudspeaker and the standard microphone are disposed in the soundproof box. The invention further relates to an IP phone terminal device hand-free tone quality testing method on the basis of the hand-free tone quality testing system, which includes steps of playing the standard sound sources through the loudspeaker of the to-be-tested IP phone terminal equipment, analyzing sound received by the standard microphone to detect the loudspeaker of the IP phone terminal equipment, playing the standard sound sources through the standard loudspeaker, analyzing sound received by the microphone of the IP phone terminal equipment to detect the microphone of the IP phone terminal equipment, and accordingly, testing of sound quality of the IP phone terminal equipment is realized. The hand-free sound quality testing system is simple in structure, low in manufacturing cost, excellent in universality, simple and convenient in testing method and better in testing effect.

A novel general bus transforming bridge IP core comprises a plurality of bus modules of different protocols and a switching module, wherein the switching module comprises a plurality of memorizers, a data switching unit, a data analysis unit, a data package unit, a state register unit and an interruption control unit. Under the state that data switching is needed, the bus modules connected with a plurality of data sending parties respectively send first interruption requests to the interruption control unit, the interruption control unit modifies the value of the state register unit according to the first interruption requests, the data analysis unit reads data of the corresponding bus modules and then analyzes the data, the data switching unit transmits the analyzed data to the corresponding memorizers, the interruption control unit sends second interruption requests to corresponding data receiving parties, the data package unit reads data from the memorizers and packages the data into a needed data format, and the data receiving parties read the packaged data from the switching module.

The invention provides a signal time delay stable transmission method and system of broadband. The method comprises the steps of producing stable frequency standard signals in a center station, producing light carrier through a tunable laser, modulating the frequency standard signals onto the light carrier, so as to form initial light signals, transmitting the light signals to a remote terminal through an optical fiber, transmitting the light signals of the remote terminal back to the identical optical fiber to the center station, demodulating the light signals which are transmitted back, comparing return radio-frequency signals and the frequency standard signals, so as to obtain a phase difference, controlling the tunable laser to change the length of the light carrier according to the phase difference, so as to obtain compensation light carrier and ensure that the sum of a chromatic dispersion time delay inequality and a link time delay variation is zero, inputting broadband radio-frequency signals from the remote terminal, modulating the broadband radio-frequency signals input by the remote terminal onto the light signals of the remote terminal, so as to form remote modulating light signals, transmitting the remote modulating light signals back, demodulating the remote modulating light signals received by the center station into stable remote terminal radio-frequency signals, and outputting the stable remote terminal radio-frequency signals. According to the invention, additional compensation devices are not needed to be arranged, and the system has a simple structure and high practicability.

An article surface morphology detection method disclosed by the present invention comprises the following steps that (1) the low-coherence light rays irradiate in from a port 1 of a three-end circulator, irradiate out from a port 2, irradiate in from an x galvanometer in an x-y scanning galvanometer after being collimated by a first lens, and irradiate out from a y galvanometer;(3) the irradiated out light rays are focused by a second lens and then are divided into two parts of light rays by a light splitter, one part of the light rays are reflected from the undersurface of a glass as the reference light, and the other part of light rays penetrate the glass and then irradiate to the surface of a sample to be reflected as the sample light; (4) the two parts of light rays are returned in a common light path, are gathered to the y galvanometer of the scanning galvanometer via the second lens, irradiate in the x galvanometer via the y galvanometer, and then are irradiate out; (5) the light rays are gathered by the first lens to enter the port 2 of the three-end circulator, and then irradiate out from a port 3; (6) the light rays irradiated out from the port 3 enter a spectrograph, and the spectrograph transmits the data to a computer; (7) the scanning galvanometer scans the sample point by point; (8) the computer calculate the phase difference of the adjacent positions and the depth difference delta Z, thereby obtaining the final quantitative distribution situation of the surface morphology of the sample.

The invention discloses a laser-scattering-based air quality detecting system. The laser-scattering-based air quality detecting system is characterized by comprising a laser transmitting system, a laser receiving system and a sample tank, wherein the laser transmitting system is provided with a laser source and a first photoelectric receiver; the laser emitted by the laser source sequentially passes through a polarizer, an aperture diaphragm, a first condensing lens, a first light splitting mirror and a second condensing lens and then irradiates the sample tank; the other path of light split by the first light splitting mirror irradiates the first photoelectric receiver; the laser receiving system is provided with a third condensing lens and a second photoelectric receiver. The laser-scattering-based air quality detecting system has the remarkable effects of being simple in structure and convenient to mount; the air quality is detected by the laser scattering manner; the light source cost is reduced; the plurality of photoelectric receivers are arranged, so that the system can be effectively corrected; the problem of unstable light source intensity can be solved; the detection accuracy is ensured; the detection requirement of the air quality can be met.

The invention belongs to the technical field of holographic display and particularly relates to a digital hologram printing system utilizing a secondary holography. The digital hologram printing system utilizing the secondary holography is characterized by comprising a write-in light source, a collimation system, a spatial light modulator, a rectangular diaphragm, a hologram recording medium, a hologram calculating system and a servo control system. By the hologram calculating system, a target hologram is divided into more than two sub-holograms; the sub-holograms are used as new target holograms; the sub-holograms are subjected to secondary holographic calculation to obtain secondary holograms; the secondary holograms are loaded into the spatial light modulator; incident laser emitted by the write-in light source is diffracted; diffraction is carried out on the hologram recording medium to form sub-hologram stripes; secondary holographic write-in of the sub-holograms is implemented; and by writing in the sub-holograms one by one, printout of the target hologram can be implemented. Particularly, in a manner of writing in a plurality of sub-holograms in parallel and splicing and adhering the sub-holograms, rapid printout of large holograms can be implemented and the problem that the large holograms cannot be printed and output by a conventional technology is solved.

The invention provides a super-large visual field multi-target scenery simulation system. The super-large visual field multi-target scenery simulation system comprises a light source system, a target system, a collimating system, a rotary spectroscopy system and a control system, wherein the light source system is used for providing a uniform surface light source which can generate target light beams through the target system, the target light beams pass through the collimating system and then are divided into more than two paths of parallel light beams through the rotary spectroscopy system, and the parallel light beams are incident into an imaging system to be tested. The super-large visual field multi-target scenery simulation system can be used for solving the problems that the production cost is high caused by a plurality of collimators, a visual field for scenery simulation is too small caused by a movement mechanism on a focal plane, and the like. The system is concise in structure, and can be used for realizing the simulation of a multi-target large visual field scenery, so that the acquisition cost of testing equipment is greatly saved. Under the condition of not adding the collimating system, the simulation of a double-target scenery is skillfully obtained. By expanding a beam splitter prism, the simulation of more targets also can be realized, so that the super-large visual field multi-target scenery simulation system is truly initiative in China.

A digital intermediate frequency measurement and control platform based on the embedded technology comprises an FPGA, an analog-to-digital converting module, a digital-to-analog converting module, an ARM embedded processor, an embedded web server module, a matching isolating module, a storage unit, a temperature measuring circuit, and the like. The FPGA is the core device of the digital intermediate frequency measurement and control platform and used for transmitting and receiving digital intermediate frequency signals. The FPGA comprises an ARM interface module, a parameter configuration management module, a transmitting and receiving FIFO, a frame generating and counting module, a frame receiving and counting module, a code conversion module, a subcarrier modulation/demodulation module, a carrier modulation/demodulation module, a digital up and down frequency conversion module, an amplitude control module, a waveform storage module and a time mark management module. By the digital intermediate frequency measurement and control platform based on the embedded technology, digital processing of satellite measurement and control intermediate signals is achieved. In addition, the platform is compact in structure, small in size, good in portability, and suitable for being carried about by testers, and the platform can be used as comprehensive base band equipment for satellite testing.

The invention relates to a coal mine safety management system and mainly solves the problem that management systems can not communicate with environmental information under the condition of instable communication in coal mine environments in the prior art. The coal mine safety management system comprises a subsystem interface module, a data sharing module, a linkage plan database, a linkage plan graphical compiling module, a linkage plan scheduling execution module, a linkage record querying module and an environmental information acquisition module. By the aid of the method, when a single system in a mine breaks down or abnormal conditions are detected, associated subsystems can be controlled to take corresponding actions according to a preset linkage plan, so that the comprehensive performance of all subsystems in the mine is improved, emergencies can be coped with efficiently, and the coal mine safety production efficiency is improved.

The invention proposes an up-flow solid carbon source biofilm carrier denitrification bioreactor, comprising a partition plate, a fixed frame, a biofilm carrier, a mechanical stirrer, a heating constant temperature device and the like, wherein the biofilm carrier is a biodegradable polyester sheet modified by thermoplastic starch; and the material is high in mechanical strength and good in biodegradability, benefits for adsorption and biofilm formation of microorganisms, and can be used for providing a carbon source for microbial denitrification. The reactor has the advantages of being concise in structure, simple and convenient to operate, easy for biofilm formation, high in treatment efficiency, strong in DO resistance and pH impact load, low in operation cost, and the like; and the carrier is environment-friendly and free of pollution, and has a high project application value.

The embodiment of the invention discloses a method and a system for measuring bias points of a double-parallel modulator, wherein the method comprises the following steps: controlling the amplitude value of the bias voltage acting on the double-parallel modulator to increase progressively through a first step value; converting an optical signal output by the double-parallel modulator under the action of the bias voltage into an electric signal; detecting the amplitude value of the electric signal, and stopping the progressive increase of the amplitude value of the bias voltage when the amplitude value of the electric signal satisfying the condition for measuring the bias points appears; and using a second step value to scan the amplitude value of the bias voltage corresponding to the amplitude value of the electric signal satisfying the condition for measuring the bias points according to the corresponding relation between the amplitude value of the electric signal and the amplitude value of the bias voltage, and calculating the bias points, wherein the first step value is larger than the second step value. By adopting the embodiment of the invention, the method and the system have the advantages of reducing the interferences between a plurality of frequencies and improving the efficiency of measuring the bias points.

The invention provides an intelligent driving real-time recording system and method. The intelligent driving real-time recording system comprises at least one distance sensor, a rotating support and an intelligent terminal, wherein the one distance sensor is installed on the outer surface of an automobile body and is used for measuring the distance from the automobile body to a surrounding obstacle; the rotating support is installed on the outer surface of the automobile body and comprises a support controller for adjusting the rotating angle of the rotating support; the intelligent terminal is installed on the rotating support and is electrically connected with the support controller, and the support controller adjusts the photographing angle of a camera in the intelligent terminal by controlling the rotating angle of the rotating support; the intelligent terminal is wirelessly connected with each distance sensor to realize data interaction. The intelligent driving real-time recording system provided by the invention only uses the distance sensor, the rotating support and the intelligent terminal; and compared with the existing driving recording system, the system structure is simple and the cost is greatly reduced.

The invention discloses a compression spring type six-degree-of-freedom quasi-zero stiffness vibration isolator and a design method thereof. The compression spring type six-degree-of-freedom quasi-zero stiffness vibration isolator comprises a fixed outer framework, a box body subjected to vibration isolation arranged in the outer framework, and vibration isolating modules which are respectively distributed on the six surfaces of the box body subjected to vibration isolation and connected with the outer framework and the box body subjected to vibration isolation; each vibration isolating module comprises a framework fixed to the outer framework, and a connecting piece fixed to the box body subjected to vibration isolation; a vertical compression spring is arranged inside the framework in the vertical direction; four lateral compression springs are arranged in the lateral direction of the framework; all the four compression springs which are the same as one another are connected with the framework and the connecting piece through joint bearings, so that the compression springs are guaranteed to be capable of rotating freely relative to the framework and the connecting piece. The six-degree-of-freedom quasi-zero stiffness vibration isolator has symmetry, so that restoring force characteristics which are the same as one another exist in three translation directions, and restoring moment characteristics which are the same with one another exist in three rotation directions. The invention further discloses a design method of the vibration isolator. The vibration isolator can realize low frequency vibration isolation in six directions.