46results about How to "Realize remote measurement" patented technology

The invention discloses a high-accuracy remote absolute displacement measurement system based on optical fiber composite interference, which belongs to the technical field of optical measurement and is composed of a board band light source, an optical fiber isolator, three 3dB couplers, four auto-collimation mirrors, two optical fiber gratings, four reflectors, two detectors, a circulator, a one-dimensional translation platform, piezoelectric ceramics, a feedback control circuit, a signal generator, a signal treatment circuit, an analog to digital (A/D) conversion card, a computer and result output. The high-accuracy remote absolute displacement measurement system uses an optical fiber interferometer to induce displacement and another optical fiber interferometer to demodulate displacement to achieve remote measurement. The optical fiber interferometer for demodulation works in a low coherence interference state and a high coherence interference state, and amplitude of displacement can be determined by low coherence signals to achieve absolute measurement. A value of the displacement can be measured by high coherence signals to feed back and control effects of environment interference on the demodulating optical fiber interferometer, and high-accuracy measurement can be obtained.

The invention relates to the technical field of dust concentration measurement, and particularly discloses an optical-fiber dust concentration measurement apparatus. The optical-fiber dust concentration measurement apparatus successively comprises a light source part, an input optical fiber, a measurement part, an output optical fiber, a signal conversion part and a data processing part. The measurement part comprises a beam splitter, a first measurement area consisting of a first transmitting end, a first attenuation area, a first receiving end and a first connecting rod, and a second measurement area consisting of a second transmitting end, a second attenuation area, a second receiving end and a second connecting rod. Laser is divided by the beam splitter into a first optical path and a second optical path and then enters the first measurement area and the second measurement area to be measured, and after the measurement, an optical signal is outputted by virtue of the output optical fiber to the signal conversion part to be converted into an electric signal, and the data processing part calculates a laser attenuation coefficient by virtue of the received electric signal. By utilizing the dual-optical-path measurement and differential operation method, a measurement error is eliminated, and the measurement precision is improved.

The invention discloses a thin film sensor for detecting carbon dioxide. The sensor comprises a porous film and an indicator and a carrier complex which are attached to the pore passage of the porous film, wherein the indicator can react with hydrogen ions and presents different colors in a protonation state and a deprotonation state; the carrier complex contains positive ions and alkaline negative ions, wherein the positive ions can be chemically connected with the deprotonated indicator in a solid phase; and according to the alkaline negative ions, the pH value in the pore passage is higher than a pKa value of the indicator in the absence of contact of carbon dioxide. According to the thin film sensor disclosed by the invention, the porous film serves as a carrier, and the characteristic that the specific surface area is large is utilized, so that the carbon dioxide can be fully contacted with the indicator, the sensitivity of the sensor is improved, and the response time is reduced. The sensor disclosed by the invention is simple in structure, convenient to use, easy to carry and low in cost and has the advantages of accuracy, rapidness, water disturbance resistance, reaction reversibility and the like, and the requirement on rapid detection of carbon dioxide can be met.

The invention discloses a pressure-sensitive optical cable with armor layer, which takes a signal optical fiber and fiber yarns spirally wound on the signal optical fiber and which is peripherally provided with an armor layer and an outer protective layer in sequence. As pressure is applied to the pressure-sensitive optical cable, the fiber yarns spirally wound on the signal optical fiber lead the signal optical fiber to bending deformation in order to change the bending loss of the signal optical fiber. As a result, pressure signals are converted into optical signals which are then transmitted via the signal optical fiber to achieve the purpose of remote measurement. The armor layer made of fine fiber material has the characteristics of excellent bending flexibility, facilitating manufacture, storage, transportation and use of the pressure-sensitive optical cable, similarity to common optical cables, being capable of remarkably reducing manufacturing and use costs, and having no impact on pressure detection. The pressure-sensitive optical cable has simple structure, reasonable design, convenient processing and manufacturing, diversified using ways, high sensitivity and good using effect, and distributive pressure measurement can be realized by means of optical time domain reflectometer or other measurement instruments.

The invention discloses an electronic information technology-based soil layer thickness measuring device for land surveying and mapping, which comprises a box body, an unmanned aerial vehicle main body and a sampling cylinder, a third transverse plate is transversely arranged in the box body and located below the first transverse plate, and one side of the third transverse plate is slidably arranged on a first sliding rail. The first sliding rail is fixedly installed on one side of the inner wall of the box body, the first lead screw vertically penetrates through a third transverse plate, a threaded through hole used for being in threaded connection with the first lead screw is formed in the third transverse plate, and a third motor is fixedly installed at the top of the third transverse plate. The electric push rod drives the push rod to extend to drive the abutting plate to move upwards to abut against the sampling barrel, soil in the sampling barrel is prevented from falling off in the recycling process, the unmanned aerial vehicle body is further used for flying to recycle the box body, remote measurement of the soil layer thickness by operators is achieved, the operators do not need to arrive at the site personally, and time and labor are saved. The adaptability is high.

The invention discloses a non-iterative ultrasonic CT temperature reconstruction method which comprises the following steps of constructing a matrix equation of a reconstruction problem, constructing a cost equation, solving the cost equation by means of a non-minimal optimization method, and reconstructing temperature distribution according to acoustic velocity. The non-iterative ultrasonic CT temperature reconstruction method is advantageous in that the non-minimal optimization method is introduced innovatively; a traditional iterative algorithm is replaced by characteristic value and characteristic root calculation; and simple method, low calculation amount and high practicability are realized. By means of the non-iterative ultrasonic CT temperature reconstruction method, remote measurement for an air temperature can be realized and a temperature distribution image is reconstructed. Furthermore the non-iterative ultrasonic CT temperature reconstruction method can be widely used for noncontact measurement at aspects of medicine, industry, etc.

The invention discloses a method and a device for pose measurement and a storage medium. The method comprises the following steps: acquiring a plurality of object photos taken at different positions and pose parameters of a shooting device when taking photos; constructing a virtual three-dimensional scene according to the object photos, and matching the virtual three-dimensional scene with a realthree-dimensional environment according to the pose parameters of the shooting device; and calculating pose parameters of an object according to the position information of the object in the real three-dimensional environment. According to the method and device for pose measurement and storage medium, remote measurement of the object pose can be achieved, operation is very simple and convenient, no measurement personnel are required to climb, and the risk of measurement is effectively eliminated.

The invention provides a device and a method for measuring dry beach length. The device is provided with a control unit and a machine head, wherein a laser sending device and a laser receiving device are arranged in the machine head. The device further comprises a base, an adjusting bracket, a first motor and a second motor; two ends of the adjusting bracket are fixed in slide rails at two sides of the base in a matching way through sliding blocks; a motor seat of the first motor is hinged to the adjusting bracket; the second motor enables pitching movement of the motor seat of the first motor through a spiral transmission mechanism; the machine head is connected with a driving shaft of the first motor; the driving shaft of the first motor is connected with a rotating coder through an universal coupling. According to the device, the dry bench length is calculated according to the distance from the measuring device to the starting original point, the distance from the measuring device to the intersection point of the dry bench surface and the water surface, and the rotating angle of the machine head correspondingly rotating to the intersection point, so that the defect of error of the measurement result and burying of the device due to the subsidence of the dry beach can be avoided, the dry beach surface can be remotely measured, and the measurement precision is high.

The invention relates to an apparatus for realizing automatic channel switching control of a large dam monitoring apparatus collective line box and a method thereof. The apparatus comprises the large dam monitoring apparatus collective line box, a collective line box controller and a communication cable. The collective line box controller comprises a power carrier wave signal generator and a microcontroller which are mutually connected. The power carrier wave signal generator is connected with a first communication interface. The microcontroller is connected with a display device, an operation instruction input device and a power supply interface. The large dam monitoring apparatus collective line box comprises a second communication interface, a power carrier wave decoding circuit, a channel selection control circuit and a relay array which are connected in order. The relay array is provided with a safety monitoring apparatus interface array and a safety monitoring apparatus core wire bus interface. The apparatus also comprises a power taking circuit. The communication cable is connected with the first communication interface and the second communication interface. According to the apparatus and the method, the large dam monitoring apparatus collective line box realizes passivity work and automatic channel switching control, and the apparatus and the method have very practical meaning to realization of large dam safety monitoring in a construction period.

The invention discloses an oscilloscope based on Internet technology and a remote control method thereof, include an electrical signal acquisition module, a controllable electric signal processing module is connected to the electric signal acquisition module in unidirectional communication, a controllable analog-to-digital signal conversion module is connected to the controllable electric signal module in unidirectional communication. A controllable analog-to-digital signal conversion module is bidirectionally communicated with a digital signal analysis and processing module, a digital signalanalysis and processing module is unidirectionally connected with a controllable electrical signal processing module, the digital signal analysis and processing module is bidirectionally connected with a data wireless WIFI transmission component, and the data wireless WIFI transmission component is bidirectionally connected with a user intelligent terminal. The invention also provides a remote control method of an oscilloscope based on Internet technology. The invention performs data exchange through wireless connection between user APP and digital signal processing module installed on user intelligent terminal, and realizes remote measurement of circuit signal and debugging of equipment in motion.

A voltage sensor probe based on the liquid crystal and optical fiber technology comprises a quartz tube with openings formed in the two ends. A metal sealing cover is arranged at the front end of the quartz tube. A metal reflector is arranged on the inner end face, located in the quartz tube, of the metal sealing cover. The voltage sensor probe further comprises a metal contact tube arranged at the rear end of the quartz tube. A glass substrate is fixed to one end of the metal contact tube. A closed inner cavity is formed by the glass substrate, the metal contact tube, the metal sealing cover and the quartz tube together and filled with liquid crystal. A polarization maintaining optical fiber is inserted in the metal contact tube and the front end face of the polarization maintaining optical fiber is axially perpendicular to a polarization maintaining optical fiber. A fiber bragg grating is arranged at the portion, located in the metal contact tube, of the polarization maintaining optical fiber. A polaroid is arranged between the front end face of the polarization maintaining optical fiber and the glass substrate. A voltage sensor based on the liquid crystal and optical fiber technology comprises an optical fiber coupler, polarization laser devices connected together through the optical fiber coupler, the voltage sensor probe based on the liquid crystal and optical fiber technology and a photoelectric detector.

The invention discloses a measurement and control integrated switch device which comprises a real-time sensing module, a control module, a switch control circuit, a positioning module and a communication module, wherein the real-time sensing module is used for generating corresponding sensing signals for output after sensing the high-voltage working signals of a monitored primary loop; the control module is used for receiving the sensing signals output by the real-time sensing module, computing the duty parameters of the primary loop according to the received sensing signals and controlling the switch control circuit to connect or disconnect the primary loop according to the computed duty parameters; the positioning module is used for obtaining the positioning information of the device and sending the obtained position information to the control module; and the communication module is used for obtaining the duty parameters and the position information from the control module and then sending the duty parameters and the position information to a power monitoring master station. According to the measurement and control integrated switch device, the primary loop can be disconnected when the circuits have failures and the power monitoring master station is capable of detecting the failure points and the failure reasons, so that the real-time remote measurement of the primary loop is realized through the power monitoring master station.

An embodiment of the invention discloses a camera-based contactless pulse rate measurement method and device, and relates to the technical field of computer images and vision. By means of the method and the device, contactless remote measurement of human body sign signals (pulse rates) can be realized. The method comprises the following steps: recognizing a human face from a shot image and extracting a facial feature point; tracking a target position in the human face to obtain image information of the target position, wherein the target position comprises the position of the facial feature point; extracting a skin pixel according to the image information of the target position; acquiring a pulse rate related characteristic signal according to the extracted skin pixel, obtaining a pulse rate time sequence according to the continuously generated pulse rate related characteristic signal, and outputting a measurement result. The method and the device are suitable for contactless measurement of human body sign signals.

The invention relates to a large-scale substation key facility monitoring system of a low-power wireless communication and a method. The system comprises an in-situ measurement and control device anda measurement and control background; the system further comprises a heater and a dehumidifier; the heater and the dehumidifier are installed in the closed cabinet of a substation; the in-situ measurement and control device is installed in the sealed cabinet, fire pool and cable trench of the substation; the in-situ measurement and control device monitors the temperature, humidity and liquid levelparameters of installation positions in real time and wirelessly transmits the temperature, humidity and liquid level parameters to the measurement and control background; and the measurement and control background starts and stops the heater or dehumidifier through the in-situ measurement and control device. Compared with the prior art, the system and method of the present invention can realizethe special monitoring of the key facilities of a large-scale substation.

The invention discloses a system and method for measuring the dynamic stress distribution of a tyre of a vehicle, and the system comprises a plurality of stress distribution measurement devices and anupper monitoring device. Each stress distribution measurement device comprises a stress measurement device, 2N measurement electrodes and a conductive ring disposed on a to-be-measured typre in a peripheral direction, wherein the conductive ring is disposed at the joint of the to-be-measured typre and a wheel hub. The method comprises the steps: 1, transmitting a stress distribution measurement instruction; 2, measuring the stress distribution; 3, synchronously uploading a stress distribution measurement result. The stress distribution measurement devices are distributed on all to-be-measuredtyres, thereby achieving the real-time and accurate measurement of the stress distribution of all tyres of a to-be-measured vehicle. Each to-be-measured tyre is provided with a conductive layer in the peripheral direction, and the 2N measurement electrodes which make contact with the conductive layers are uniformly distributed on the wheel hub in the peripheral direction are used for the measurement of the stress distribution. The system and method can achieve the real-time and accurate measurement of the real stress distribution of the tyres.