268 results about "Microwave detectors" patented technology

System and methods are disclosed for fluid measurements which may be utilized to determine mass flow rates such as instantaneous mass flow of a fluid stream. In a preferred embodiment, the present invention may be utilized to compare an input mass flow to an output mass flow of a drilling fluid circulation stream. In one embodiment, a fluid flow rate is determined by utilizing a microwave detector in combination with an acoustic sensor. The acoustic signal is utilized to eliminate 2 pi phase ambiguities in a reflected microwave signal. In another embodiment, a fluid flow rate may be determined by detecting a phase shift of an acoustic signal across two different predetermined transmission paths. A fluid density may be determined by detecting a calibrated phase shift of an acoustic signal through the fluid. In another embodiment, a second acoustic signal may be transmitted through the fluid to define a particular 2pi phase range which defines the phase shift. The present invention may comprise multiple transmitters / receivers operating at different frequencies to measure instantaneous fuel levels of cryogenic fuels within containers positioned in zero or near zero gravity environments. In one embodiment, a moveable flexible collar of transmitter / receivers may be utilized to determine inhomogenuities within solid rocket fuel tubes.

System and methods are disclosed for fluid measurements which may be utilized to determine mass flow rates such as instantaneous mass flow of a fluid stream. In a preferred embodiment, the present invention may be utilized to compare an input mass flow to an output mass flow of a drilling fluid circulation stream. In one embodiment, a fluid flow rate is determined by utilizing a microwave detector in combination with an acoustic sensor. The acoustic signal is utilized to eliminate 2pi phase ambiguities in a reflected microwave signal. In another embodiment, a fluid flow rate may be determined by detecting a phase shift of an acoustic signal across two different predetermined transmission paths. A fluid density may be determined by detecting a calibrated phase shift of an acoustic signal through the fluid. In another embodiment, a second acoustic signal may be transmitted through the fluid to define a particular 2pi phase range which defines the phase shift. The present invention may comprise multiple transmitters / receivers operating at different frequencies to measure instantaneous fuel levels of cryogenic fuels within containers positioned in zero or near zero gravity environments. In one embodiment, a moveable flexible collar of transmitter / receivers may be utilized to determine inhomogenuities within solid rocket fuel tubes.

The invention relates to an all-directional intelligent monitoring method, in particular to an all-directional intelligent monitoring method for bank ATMs (Automated Teller Machines). The all-directional intelligent monitoring method is characterized in that at least four paths of videos can be monitored in real time, an emergency alarm and a non-emergency alarm can be given for the monitoring behavior of each path of video, and various unconventional behaviors can be identified by the aid of external shock sensors, microwave detectors, acoustic sensors and other various sensors. The video comprises at least one ATM panel video, at least one ATM scene video, at least one wide-angle scene video of a self-service bank where the ATMs are mounted, and at least one ATM cash replenishing room video. By adopting the technology provided by the invention, such abnormal behaviors as mounting fake keyboards, mounting fake card readers, mounting or dismounting a keyboard shield, maliciously sticking strips, operating the ATMs for a long time and the like can be intelligently identified during monitoring of ATM panel video. Therefore, the method is suitable for large-scale installation in banks.

A prewarning system for preventing the follow-behind chase collision on expressway is composed of a central processing unit CP and detecting lines DL which consist of microwave detector, road terminal and warning indicator, the said detecting lines are installed at the inner roadside of bidirectional lanes at intervals and is connected to the CP via data transmission line. Its method features that the information about the passed vehicles is sensed by the microwave detector, and the signal from the said detector and the information from the detecting lines are processed by road terminal for generating traffic signals.

The invention provides a foundation-based atmosphere profile microwave detector. The detector is characterized by comprising an antenna feeder unit, a radiometer receiving unit and a scanning mechanism unit, wherein the antenna feeder unit comprises two independent antenna feeder sub-units for two wavebands and is provided with two-frequency independent reflective surfaces; the two independent antenna reflective surfaces are arranged at two ends of the output shaft of a scanning motor respectively, can realize beam scanning through motor rotation, and are used for receiving microwave radiation of atmosphere and an internal calibration reference source; the radiometer receiving unit comprises a directional coupler, a radio amplifier, a power divider, a band pass filter, a square law detector, an integrator and a video amplifier, and is used for realizing intermediate frequency detection of a received signal; the scanning mechanism unit comprises a scanning shaft, a scanning step motor, two front ends and a sub-miniature type A (SMA) connector; and driven by the scanning motor, the scanning shaft drives the two reflective surfaces to circumferentially scan so as to realize observation on sky in different incident angles and measurement on an internal calibration blackbody and acquire data which is acquired in a measurement and periodic internal calibration unit.

The invention relates to resident travel OD matrix calibration method by use of mobile phone signaling big data and dynamic traffic distribution. The method comprises the following major steps: a city road simulation network model is constructed, simulation parameters of each road in a constructed city road network are calibrated by use of microwave and bayonet data, a real traffic flow in an actual road network is obtained by use of a microwave detector, a traffic flow of an initial OD matrix is obtained by use of mobile phone signaling data, through a dynamic traffic distribution method, an initial traffic flow is dynamically adjusted so as to be enabled to be close to the real traffic flow in the road network, an error between a simulation estimation traffic flow and the real traffic flow is calculated, if the error satisfies a threshold, calibration ends, and otherwise, dynamic distribution based on simulation is continuously carried out until the calibration ends. According to the invention, a dynamic OD matrix of resident travel is calibrated by use of the mobile phone signaling big data, and the method has the advantages of stable and objective data information sources, large sample size, wide coverage scope, high data precision, high dynamic performance and the like.

The invention provides an overflow control method for a city intersection based on a wide area radar microwave detector. The overflow control method gives the concept of overflow of the intersection from the aspect of signal control ability, the wide area radar microwave detector is installed, and the current operating condition of the intersection is judged according to the regional vehicle number collected by the detector, overflow coefficient built by space occupancy and average speed of road condition information. After the condition that the intersection is in overflowed state is judged by the overflow coefficient, traffic congestion is eased by using the method of changing the timing scheme, and the signal control resource method is provided.

The invention relates to a high-efficiency elevator adopting certain-hardware equipment and a management system by adopting a certain number of infrared microwave detectors, a pressure sensor and an electronic monitor. Different from a common monitor, the electronic monitor is additionally provided with an area of a number of floors to be stopped and an area of the residual effective elevator load number. By upgrading monitor contents used in a common elevator, i.e. adding the area of the residual effective elevator load number and the area of the number of floors to be stopped, mounting the pressure sensor in the elevator and mounting the infrared microwave detector at the elevator entry, the invention solves the following problems: how to let passengers waiting for the elevator to know the real-time conditions of the elevator, how to acquire the real-time information of the elevator, and how to acquire whether a person waiting for stairs waits for the elevator or not. Accordingly, the passengers can clearly know the real-time conditions of the elevator which can acquire more real-time information so that the conditions, such as, the full elevator still stops, nobody gets on the stopped elevator, a waiter waits in vain, and the like can be avoid, and the operation efficiency of the elevator is improved, the energy-saving aim is achieved, and the operation cost of the elevator is decreased.

The invention discloses an intelligent traffic signal lamp control system which comprises a traffic flow signal collecting unit, a processor unit connected with the traffic flow signal collecting unit, a wireless sending and receiving module connected with the processor unit, a traffic signal lamp controller in long-distance wireless connection with the wireless sending and receiving module, a displayer connected with the traffic signal lamp controller, and a signal lamp driver used for driving the traffic signal lamp to be lighted. The traffic flow signal collecting unit comprises a microwave detector and a camera. The processor unit comprises an ARM microprocessor, a clock module and a Flash storage module, and the clock module and the Flash storage module are connected with the ARM microprocessor. The microwave detector, the camera and the wireless sending and receiving module are connected with the ARM microprocessor. The intelligent traffic signal lamp control system is simple in structure, reasonable in design, convenient to mount and implement, easy to use and operate, the displaying color and time of the traffic signal lamp can be adjusted automatically according to traffic flow information, practicability is strong, implementation cost is low, using effect is good, and popularization and application are convenient.

The invention discloses a cantilever beam and direct-type power sensor based microwave detecting system and a detecting method thereof. The detecting system comprises an MEMS (micro-electromechanical system) reconfigurable antenna, an MEMS adjustable filter, a control circuit and a microwave detector, the microwave detector is manufactured on a GaAs substrate and comprises a CPW (coplanar waveguide) transmission line, four structurally identical MEMS cantilever beam structures, a power combiner and four structurally identical MEMS direct-type microwave power sensors. The cantilever beam and direct-type power sensor based microwave detecting system has the advantages of novel structure and small size, can achieve integration of microwave signal frequency and power detection, and can be compatible with a GaAs monolithic microwave integrated circuit.

The invention provides a freeway management system. The freeway management system consists of a three-level management structure, namely a freeway provincial monitoring management center, a municipal monitoring management center and a front-end infrastructure monitoring unit, wherein information of the front-end infrastructure monitoring unit is gathered to the municipal monitoring management center, and is gathered to the provincial monitoring management center through the municipal monitoring management center, so that the linkage is realized. The front-end infrastructure monitoring unit comprises a microwave detector for detecting parameters, such as road section speeds, traffic flows, vehicle distances and vehicle models, a surveillance camera, a broadcasting system, a system server and a management host. The microwave detector, the surveillance camera and the broadcasting system are respectively connected with the system server and the management host.

The vehicle detecting device consists of detecting unit, signal processing / transmitting unit and power supply. The detecting unit consists of geomagnetic imaging detector and sound, vibration, pressure, ultrasonic, temperature or microwave detector; the signal processing / transmitting unit includes at least amplifier and may have microprocessor, I / O interface, radio signal or fiber signal transmitter as well as sub-detecting unit. The present invention can be used to obtain traffic flow, road occupying rate, vehicle rate, parking time, and other information and may be used widely in traffic and park monitoring, management and command. The present invention has the advantages of low cost, small size, modulization, high reliability, etc.

A microwave apparatus comprises a microwave source for providing a microwave signal, connectable to a load; control means configured in operation to vary over a frequency range a frequency of the microwave signal provided by the source; a microwave detector for performing microwave measurements, arranged to receive reflections from and / or transmissions to the load in operation and to perform a plurality of measurements, each measurement corresponding to a respective one of a plurality of different frequencies of the frequency range; and means for determining from the plurality of measurements a measure of reflection and / or a measure of transmission.

A humidity sensor which utilizes microwave energy to determine a particular humidity value, e.g., a relative humidity, a specific humidity, or a dew point, without the need for delicate moving parts. The microwave humidity sensor requires little if any maintenance over a significantly long operational life, and is capable of highly accurate humidity measurements even at the extremes (e.g., toward 0% relative humidity and toward 100% relative humidity. In the disclosed embodiment, a microwave generator / transmitter is continuously or periodically pulsed to cause a known amount of microwave energy to be propelled through a metal tube structure, e.g., a waveguide tube structure. A microwave detector measures the amount of microwave energy at the other end of the tube structure. A processor measures the temperature of the ambient air within or just outside the tube structure and the pressure, and by measuring the output of the detector determines the amount of microwave energy which was absorbed during the passage through the tube structure. Given the amount of microwave energy absorbed and the temperature and pressure of the ambient air, a value for a desired humidity value is determined using interpolation as necessary from a look-up table containing empirically obtained absorption and temperature / pressure values for given humidity values.

The invention provides a method for processing real time data of a lunar satellite microwave detector. The method comprises the following steps of: receiving an original bit-stream data transmitted by a satellite in real time; performing frame data processing on the original bit-stream data; extracting microwave detector data from the original bit-stream data; unpacking the data to obtain data blocks; carrying out physical quantity conversion and processing on the data blocks to obtain a format applicable to display, and displaying the data in a manner easy to be recognized by human eyes; analyzing the displayed data, and judging whether the data is normal or not; and when the data is judged to be abnormal, processing the data by using corresponding measures according to the types of the data. The processing method can process and analyze the scientific data and engineering data which are detected by the lunar satellite microwave detector in real time, so that engineering technical staffs can easily monitor the state of the detector and process abnormal condition.

The invention provides a spin microwave oscillator and a spin microwave detector. The spin microwave oscillator of the invention is directly controlled by direct current based on microwave oscillationand output of a spin angle momentum transfer principle, or jointly regulated and controlled by direct current and impressed static magnetic field, has the advantages of miniaturization, high integration, low power consumption, high controllability and tunability and the like. The spin microwave detector of the invention directly detects input microwave by direct voltage generated by the input microwave, and has the advantage of direct measurement on high-frequency signals in no need of hybrid frequency.

The invention discloses a calculation method and system of a road emergency evacuation capability index system. The method comprises the following steps of: detecting and acquiring the actual speed of a road, the actual flow of the road and the time occupancy ratio by a microwave detector; and acquiring the unblocked reliability, the travel time reliability and the load margin of the road according to the actual flow of the road and the time occupancy ratio. With the steps, the emergency evacuation capability of the road can be evaluated by adopting the speed, the unblocked reliability, the travel time reliability, the load margin and other parameters. By the invention, traffic management personnel know the utilization rate of road resources in the space and accurately grasp the traffic volume held by the road; and the calculation method has important guidance significance on the rescue, the conduct and the dredge of emergencies.

The embodiment of the invention discloses a vehicle passage control device, which comprises a video vehicle detector, a microwave detector, a plurality of front ascending and descending ground piles, a plurality of back ascending and descending ground piles and a ground pile controller, wherein the video vehicle detector is used for detecting images or videos of vehicles, obtaining the vehicle information of the vehicles according to images or videos, and comparing the vehicle information with the preset vehicle information, the microwave detector is used for detecting the vehicle speed of the vehicles, and the ground pile controller is used for controlling the front ascending and descending ground piles to ascend when the vehicle information is not matched with the preset vehicle information, and is also used for controlling the front ascending and descending ground piles and the back ascending and descending ground piles to ascend when the vehicle speed detected by the microwave detector is higher than the preset vehicle speed. The vehicle passage control device can be used for blocking vehicles making a breakthrough in a forced way.

The invention provides a high-speed-digital-demodulation-based power control system and method of a vector network analyzer. On the basis of the digital demodulation and processing way, nearly all digital filters with any random bandwidths can be designed by using a digital signal processing technology, thereby improving the signal to noise ratio of demodulation and achieving an objective of enlarging a power scanning range. The digital demodulation link of the vector network analyzer has high linearity, so that the power control accuracy is improved. With the power control method for digital demodulation and processing, the designs of circuits of microwave detector and a log amplifier and the like are not needed, thereby simplifying the loop hardware design. Because demodulation is carried out on the intermediate frequency without limitation of a signal source frequency range, the same set of amplitude stabilization system can be applied to power control of the vector network analyzer in different power ranges as long as the intermediate frequency is not changed.

A resonant tunneling diode or diode array oscillator (10) including a resonant diode (11) is coupled to a millimeter-wave source (14) and a quench generator (16) for periodically quenching the oscillations so that the average oscillation time of the oscillator is proportional to signal strength of the source (14). The signal source can be from an antenna such as a dipole or tapered slot line antenna.

The invention is directed to the technical field of road traffic running speed on road monitoring, and particularly relates to a method using the mobile phone signaling data location to switch the traffic flow speed. The method comprises the steps that S1 a Tyson polygon formed by a base station is used as the coverage of the base station; S2 the forward switching sequence and the reverse switching sequence of a target road are constructed, and a GIS platform is used to acquire the road distance set and the reverse distance set under the single base station coverage; S3 based on the base station label and the switching time, the switching trajectory of the user base station is extracted; S4 trajectory matching degree verification is carried out on the user trajectory sequence and a standard switching sequence; S5 the speed of a successfully matched user is acquired; and S6 the steps from S3 to S5 are carried out on all users to acquire the traffic flow speed of the target road. Through the example of comparison with the traffic flow speed detected by a microwave detector, the fact that the traffic flow speed acquisition method based on location switching can effectively acquire the traffic flow speed of the road is verified.

The present invention is a multi-threat detection method and system for high-traffic areas, such as airports, other mass-transit hubs, malls, symposiums, and the like. The detection methodology comprises a set of detection blocks, each performing different functions, and taking the information resulting from each block and entering it into one or more detection algorithms. The blocks comprise microwave detectors, co-polarization versus cross-polarization processors, magnetometers, and cameras (optional). The values calculated by the blocks are entered into machine learning algorithms which detect a threat if a threshold value is met. The detection occurs at a distance and the alarm may be silent, such that authorities are able to address threats without the target being aware. The alarm is also able to differentiate among varying threats based on the values calculated. No shadowing problems exist, and thus several targets may be monitored simultaneously without slowing down the speed of processing.

The load on an aircraft component, such as the load on a landing gear leg during braking, is measured with a contactless, all-weather displacement measuring system. The system includes a control unit a controllable microwave emitter of electromagnetic radiation and a microwave detector comprising a plurality of antennae. When the aircraft component is subjected to a load relative movement of the emitter and detector is caused. The detector generates in response to microwave radiation received from the focused beam of radiation emitted by the emitter a signal that is received by a signal processor of the control unit. The signal received by the control unit depends on the relative positions of the emitter and detector. The control unit is arranged to provide an output signal representative of the load sustained by the aircraft component. The system may be used to control braking in dependence on the output signal so as to maximise braking efficiency without overloading the landing gear leg.

The radar peak field strength testing device may be used in measuring the near field peak strength of radar antenna in the frequency range 0.1-18 GHz. The testing device includes microwave field strength probe, microwave field strength instrument and computer. The probe includes micro antenna, shielded probe box, microwave detector and electrooptical converting circuit inside the box. The microwave field strength instrument consists of photoelectronic converting circuit, signal processing circuit and virtual oscillograph connected together. The microwave field strength instrument is connected to the probe with fiber and has output connected to the computer. The present invention can measure the peak field strength and average field strength of near radar field and the waveform of radar pulse. Using fiber as transmission medium makes the microwave field strength instrument far from the measured radar, raising the antijamming capacity and avoiding damage of electromagnetic radiation to the tester.

This patent refers to an electronic equipment unit, which is intended to collects, process and transfer data from a certain area, which it monitors, to a telemetry system. In more detail, data are collected from various intrusion monitoring sensors (e.g. infra-red or microwave detectors), water level detectors, smoke detectors, electrical supply watchdogs etc. These sensor are external and use the logic circuits of the printed circuit board. The above mentioned data are suitably processed by the unit and the output is sent to a telemetry system via an external interface box. The advantages of this patent is the small size of the device and the low cost of the construction and operation of the device. It integrates on one printed circuit board (PCB) the processor and the logic circuits of a variety of sensors. Owing to its small size, the device can be easily installed inside sealed cellular telephony antenna shelters (outdoor shelters).

The invention relates to a power transmission line anti-theft device, in particular to a power transmission line tower material anti-theft warning device which solves the problem that no power transmission line tower material anti-theft warning device can realize real time monitoring at present. The power transmission line tower material anti-theft warning device comprises a mainframe, a radar type microwave detector which is connected with the mainframe and a vibration signal collector. The mainframe comprises a casing and a control circuit in the casing. A solar panel is fixed on a faceplate of the mainframe casing. The control circuit comprises a singlechip U0. The radar type microwave detector and the vibration signal collector are connected with the control circuit in the mainframe casing by an interface. A signal output end of the singlechip U0 is connected with a signal emitting circuit which comprises a mobile phone module and a SIM card chip. The vibration signal collector comprises the casing and an internal circuit. The internal circuit comprises a vibration sensor, an amplifying circuit and a pulse counting chip. The warning device has active protection function for finding that an iron tower is stolen, informing the relative personnel and ensuring the safe and reliable operation of an electric fence.

The invention discloses a human body existence detection method based on hybrid detection, a microwave detector and application, wherein the microwave detector comprises at least one microwave detection module and at least one signal conversion module, a difference signal is generated by the microwave detection module based on the Doppler effect principle, the signal conversion module is connectedwith the microwave detection module in a communication mode, the difference signal is converted into a fluctuation signal by the signal conversion module, at least one conversion channel is formed bythe signal conversion module, the conversion channel only allows the fluctuation signal within a specific frequency range to pass through, and when a human body exists in a detection area, the microwave detector can obtain at least one action characteristic of the human body in the detection area.

The invention discloses a microwave detection system and a detection method of the microwave detection system based on clamped beams and direct-type power sensors. The microwave detection system comprises a micro-electromechanical system (MEMS) reconfigurable antenna, an MEMS adjustable filter, a control circuit and a microwave detector, wherein the microwave detector is prepared on a GaAs substrate and comprises a coplanar waveguide (CPW) transmission line, two micro-electromechanical system (MEMS) clamped beam structures in the same structure, a power combiner, and four MEMS direct-type microwave power sensors in the same structure. The microwave frequency and power detection system based on the clamped beams and the direct-type power sensors not only has the advantages of being novel in structure and small in size, but also is capable of achieving the integration of microwave signal frequency detection and microwave signal power detection, and is compatible with a GaAS monolithic microwave integrated circuit.

The invention provides a structure surface deformation monitoring system. The system is used for monitoring three-dimensional surface deformation of a structure to be detected and comprises at least three microwave detectors, a data acquisition transmission unit and a remote control processing system. The at least three microwave detectors are arranged at different elevation positions respectively and forms mutual intervisibility with the structure to be detected. The invention simultaneously provides a structure surface deformation monitoring method. By using the structure surface deformation monitoring system and the method provided in the invention, static state deformation of three directions and a dynamic vibration characteristic of the structure to be detected can be simultaneously measured; an automation degree is high and continuous and real-time measurement can be achieved; and the system and the method are suitable for various kinds of demands of complex structure surface deformation monitoring.

The present invention discloses a novel microwave detector with high sensitivity. The novel microwave detector comprises a signal acquisition module, a rectifier module, a signal detection module and a signal display module, which are connected in turn, wherein the rectifier module comprises a fixed magnetic layer with in-plane balanced magnetization, a non-magnetic isolating layer formed on the fixed magnetic layer, and a magnetism free layer formed on the non-magnetic isolating layer and having vertical magnetocrystalline anisotropy. The microwave detector provided by the present invention has the characteristics of being small in size, high in sensitivity and simple in structure; and the preparation technology is compatibility with the prior art, easy for mass production, and widely applicable to fields such as high-speed multichannel communication, week signal detection and microwave power transmission.