222results about How to "Enables direct measurement" patented technology

The invention discloses an integrated probe type photoelectric water-quality multi-parameter online measuring system. The integrated probe type photoelectric water-quality multi-parameter online measuring system comprises a control and data acquiring unit and an optical system unit, wherein the control and data acquiring unit comprises an upper computer, a control and data acquiring unit and an acquiring device, the optical system unit comprises a composite light source and a light path, the composite light source comprises a left light source and a right light source, the left light source is an LED array composed of many LED light sources different in wavelength, and the right light source is composed of ultraviolet LED light sources and near-infrared LD (laser diode) light sources. The upper computer controls the light source to emit different wavelengths of light to irradiate water body to be detected by the control and data acquiring unit and triggers substances of the water body to be detected to emit fluorescent and scattered light signals. The integrated probe type photoelectric water-quality multi-parameter online measuring system has the advantages that direct detection can be realized without any chemical reagent, data detection is fast and complicated steps are avoided. Meanwhile, detection of types and concentration of various algae in the water and online detection of hydrocarbon content and turbidity can be completed; detection can be independent and accurate, and different needs of environment monitoring are met.

The invention discloses an overhead wire icing on-line monitoring device based on machine vision, which is composed of hardware and software, wherein the hardware is divided into a lower computer and an upper computer; the lower computer hardware comprises a controlling and processing unit based on DSP, an image acquisition unit, a data acquisition unit, a data storage unit, a GPRS wireless communication unit and a solar energy photovoltaic light source unit; the upper computer hardware is composed of a monitoring center server unit and a GPRS wireless communication unit; and the upper computer hardware and the lower computer hardware realize wireless communication via a GPRS wireless network. The software is also divided into an upper computer and a lower computer, wherein, the lower computer software is in charge of driving the lower computer hardware to collect images and data, and the lower computer software calculates and judges icing thickness and type according to the collected image; then the GPRS wireless communication unit is driven to send compressed image and monitoring results to the upper computer; the upper computer software is in charge of driving upper computer hardware to finish GRPS wireless communication and realizes human-computer interaction interface and monitoring information management. The invention can monitor icing disasters on all sides.

The invention discloses a lifting rope swing angle detection device used for cranes, comprising at least one angle sensor (24) and a sleeve (22) coaxially sheathed outside a lifting rope (23), wherein, the angle sensor (24) is installed on the outer wall of the sleeve (22), and an anti-slide device is arranged between the sleeve (22) and a crane arm head (21) so as to prevent the sleeve (22) fromaxially rotating along the sleeve. Thus, the invention realizes the direct measurement of the lifting rope deflection angle, simplifies the structure of the detection device and ensures small occupation space; meanwhile, the anti-slide device arranged between the sleeve (22) and the crane arm head (21) prevents the crane arm head (21) from rotating along the vertical shaft of the crane arm head (21), so that the stability of the device detection coordinate system can be kept, and the detection accuracy of the device is improved. The invention also discloses a crane comprising the above lifting rope swing angle detection device.

The invention relates to a cable cold shrink intermediate joint interface pressure measuring apparatus and method thereof. The apparatus includes a plurality of pressure sensors, a signal acquisition unit, and a data processing unit, the pressure sensors are pre-embedded in the cross-linking polyethylene insulation surface on the starting side of the cold shrink tube of a cable cold shrink intermediate joint and is corresponding to the middle parts of the core-pulling silicone rubber of the cold shrink tube and the cross-linking polyethylene interface, the pressure sensors are equally spaced in the same circumference, the signal acquisition unit reads the electrical signals generated by the pressure sensors in real time during the cable normal running process and transmits the electrical signals to the data processing unit, and the data processing unit obtains the interface pressure value of the cable cold shrink intermediate joint according to the preset corresponding relation between the electrical signals and the pressure values. According to the invention, the direction measurement of the cable cold shrink intermediate joint interface pressure is realized, and the errors brought by the indirect measurement can be prevented, so that the accuracy of the measurement result can be effectively improved.

The invention discloses a tunnel surrounding rock scanning and observing system based on a dual-shield TBM technology. The system comprises multiple scanners and an upper computer; the upper computeris positioned at the axis of the shield of an auxiliary propulsion oil cylinder position; the scanner is installed at each observing hole of the shield of the cross section of the auxiliary propulsionoil cylinder. According to the system provided by the invention, the scanner is installed at the preset observing hole on the rear shield to achieve direct measurement; data is collected via multiplecoordinate systems and processed in a unified manner; a scanning system for propelling observation on the profile of the tunnel surrounding rock and rock appearance by accompanying tunneling similarto well logging during drilling is formed; drawing of a two-dimensional profilogram of the cross section of a tunnel, building of a three-dimensional model of the actual excavation face of the tunnel,surrounding rock appearance imaging of the cross section of the tunnel, and three-dimensional rock appearance imaging of the actual excavation face of the tunnel within a certain angle range of the top of the whole tunnel can be achieved; in addition, the scanners and the upper computer are installed in a modularized manner, and the internal different modularized measurement devices can be changed according to needs, to achieve more functions.

The invention relates to a method for measuring liquid surface tension based on an axisymmetrical liquid drop profile curve and a volume. The method comprises the steps that image collecting equipment is used for shooting a picture of a liquid drop spreading on the upper surface of an auxiliary testing platform or a picture of a liquid drop hung below the surface of an axisymmetrical auxiliary support placed horizontally; the picture is processed to extract the liquid drop profile curve; a measuring point is selected from the liquid drop profile curve; geometric parameters on the liquid drop profile curve, which are relevant to the selected measuring point, are measured; the liquid drop volume from the selected measuring point to the liquid drop peak is worked out according to the liquid drop profile curve; and the liquid surface tension can be worked out directly or by using formulae gamma=(rhogVR-piRrhogr<2>H)/(2pir<2>-2piRrsin theta) or gamma=(rhogVR-piRrhogr<2>H)/(2piRrsin theta-2pir<2>) according to the measured geometric parameters and the volume. According to the method, image defects close to a contact line between the liquid drop profile curve and the surface of the auxiliary testing platform are avoided by the preferable measuring point.

An ultra-short pulse time waveform and chirp rate measuring device comprises a first coupling mirror, a second coupling mirror, a spectroscope, a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a cross-correlation crystal, a frequency doubling crystal, a fourth reflecting mirror, a fifth reflecting mirror, a diffraction element, a photoelectric detector and a computer. Front-edge and rear-edge high-resolution ratio measuring of ultra-short pulses is achieved through a cross-correlation method to obtain time waveforms and pulse widths. Ultra-short pulse spectrum measuring is achieved through diffraction elements orthogonal to the time axis to obtain the spectrum width, and accordingly, the chirp rate of measured pulses can be obtained based on the pulse width and the spectrum width, the requirement of physical experiments for the time waveform measuring and the requirement of an Ultra-short pulse laser system for measuring of the chirp rate are met conveniently.

The invention relates to a nuclear magnetic resonance detection meter and a nuclear magnetic resonance detection of hidden troubles of dam leakage. A transmitting controller and a receiving controller are connected to a computer through a communication controller. The transmitting controller is connected to a transmitting bridge circuit through a transmitting circuit and a large power supply. A first collecting unit is in a series connection with a second, a third... and an Nth collecting unit, and the first, the second... and the Nth collecting unit are respectively connected to a first, a second... and an Nth receiving coil. The receiving controller is connected to the Nth collecting unit. Multi-turn rectangular transmitting coils are disposed on the top of a dam and the receiving coilsare used to receive signals. Once the receiving coils collect nuclear magnetic resonance response signals, that dam leakage exists can be proved, and a water distribution map of the dam can be drawn after the signal data is processed, so as to determine a leakage location. By adopting nuclear magnetic resonance to detect hidden troubles of dam leakage and measuring the inner water content of the dam directly, the leakage location of the dam can be determined more precisely, thereby reducing damages to the dam in the detection maximally and adding no new potential safety hazard any more. Moreover, the whole detection can be completed on the top of the dam. The detection meter and the detection method are convenient for detecting operation.

The invention relates to a testing device for hovering characteristics of a pendulum type rotor system of a Mars unmanned aerial vehicle, and relates to the hovering characteristics testing field of the rotor system of the unmanned aerial vehicle. The device solves the problem that it is difficult to simulate accurate tests of rotor performance in the Martian environment through rotor hovering test devices on the ground. The device includes a Martian atmospheric environment simulator, a support frame, a rotor system and a pendulum angle detection device; the support frame is placed in the Martian atmospheric environment simulator, and the rotor system and the pendulum angle detection device are fixed on the support frame; the rotor system is used for generating rotor lift in the horizontaldirection; the pendulum angle detection device is used for detecting the pendulum angle value of a rotor connecting rod under different rotor lift in a rotor system. The device is mainly used for testing the rotor system of the unmanned aerial vehicle in the Martian environment.

The invention relates to a device and a method for measuring all physical polarization parameters based on least square optimization. The device consists of a laser, a polarizer, a two-stage cascaded phase modulator, a device to be measured and a polarization analyzer. The method comprises the following steps that: light generated by the laser passes through the polarizer, linearly polarized light is output and enters the two-stage cascaded phase modulator, the output of the modulator directly enters the polarization analyzer or enters the polarization analyzer via the device to be measured, and the polarization analyzer measures Stokes parameters in input and output light polarization states of the device to be measured under the two conditions, which correspond to the same group of photoelectric modulator modulated voltages; a system equation set which comprises all 16 physical parameters for describing the polarization properties of the device is established according to a relationship between the input and output polarization states of the device to be measured and a Mueller matrix for reflecting the depolarization characteristic, polarization dependent loss characteristic and double refraction characteristic of the device to be measured; and the equation set is subjected to numerical solution by a least square method, and the 16 solved physical polarization parameters can be obtained through optimization.

The invention provides a method for directly measuring concentration of DON (Dissolved Organic Nitrogen) in water body based on an electrodialysis pretreatment manner. The method is characterized by comprising the following steps: firstly, quickly and effectively separating DON from DIN (Dissolved Inorganic Nitrogen) by adopting an electrodialysis separation technology, and then directly obtaining the DON concentration through the TDN (Total Dissolved Nitrogen) test. The purpose of the electrodialysis is to remove the DIN and retain the DON; when the content of DON accounts for a major part of the TDN (for example, the proportion of the DIN to the TDN is smaller than 0.1) in a treated water sample, the electrodialysis treatment is stopped, and after a while, the content of the TDN is equal to the content of the DON in the water sample. The method greatly improves the accuracy and precision of the DON measurement in the water sample, solves the problems that the conventional water sample DON measuring method is indirect, and low in accuracy and precision, and consumes time, can be widely applied to the DON detection in various water bodies, and also can be used for measuring the DON in solid particles or atmospheric haze particles capable of being dissolved in water.

The invention provides a water leakage amount measurement method in case of a water leakage fault of an arc heater. The method comprises the following steps: obtaining spectrum information of a high-temperature high-speed gas, according to the spectrum information, obtaining an intensity ratio I<H>/I<O> of a hydrogen atom feature spectral line lambda <H>=656.28nm to an oxygen atom feature spectral line lambda <O>=777.19nm through calculation; and based on thermodynamic balance conditions, according to the intensity ratio I<H>/I<O> and a known oxygen atom number density no, obtaining an hydrogen atom number density nH through calculation, and according to n<H2O>=2n<H>, obtaining a water leakage amount through calculation. On one hand, the burning damage degree of the heater can be monitored through real-time change of the water leakage amount, and on the other hand, the arc heater can be rapidly shut down in case of water leakage can also be realized through linkage with a control system. The method is more accurate and direct than a conventional method and makes up for the technical blank of difficult quantitative measurement of the water leakage amount of the heater in case of the water leakage fault at home and abroad at present. The method is simpler, the cost is low, the reliance on environment is small, the method can be conveniently realized in arc heaters and arc wind tunnels, and the system reliability is higher.

The invention relates to the technical field of testing, and discloses a chip testing device. The device comprises a testing seat assembly, a heating assembly, a temperature measuring assembly and a controller, wherein the testing seat assembly comprises a fixing plate assembly and a conductive member, part of the heating assembly is arranged in the fixing plate assembly, the temperature measuringassembly can slidably penetrates through the heating assembly and can be in contact with the chip to measure the temperature of the chip, the externally arranged controller and the testing seat assembly are arranged at intervals, the externally arranged controller is electrically connected with the heating assembly and the temperature measuring assembly, and the externally arranged controller comprises a display module and used for inputting a preset temperature and displaying a temperature measuring result. The chip testing device has the advantages that the externally arranged controller and the display module operate at room temperature, so that the service life of the externally arranged controller and the display module is prolonged, and the preset temperature can be adjusted in thetesting process to improve the flexibility of temperature control; in addition, the direct measuring on the temperature of the chip can be achieved by the temperature measuring assembly, and thereforethe measuring accuracy is improved.

A sheet metal hot stamping force measurement device of the present invention belongs to the sensing, measurement and control technology field, in particular relates to a stamping force test technology during a sheet metal hot stamping processing process. The force measurement device is composed of a pedestal, an upper cover, four piezoelectric quartz sensors, a lead wire output interface, a lead wire, a sealing ring, a pre-tightening bolt and a protection pad. The four piezoelectric quartz sensors are distributed inside the force measurement device evenly, and the sensitivity of the force measurement device is improved by a method of combining a plurality of sensors. An integrated load sharing ring structure is arranged in the center of the pedestal, so that the force measurement device is compact in structure and large in rigidity, the situation that the sensors are damaged by the overlarge stamping forces, can be avoided, and the measuring range of the force measurement device is expanded. The upper cover is equipped with a cooling hole, so that the situation that the high temperature is transmitted to the sensors and a press, can be avoided, the service life of the force measurement device and the stamping precision of the sheet material are improved. The force measurement device has the excellent characteristics of being high in rigidity and sensitivity and being high temperature resistant, and can be installed between a hot stamping press sliding block and an upper die directly, thereby measuring the stamping force directly.

The invention provides a satellite-borne laser near-coast terrain detection laser radar and a detection method. The satellite-borne laser near-coast terrain detection laser radar comprises a laser, atransmitting optical light splitting device, a large-aperture telescope, a relay optical device, a multi-channel photoelectric detector, a laser controller, a signal acquisition and processing module,a signal conditioning and detector control module and a comprehensive controller. Parallel dual-wavelength laser emission is utilized, large dynamic detection of deep sea and shallow sea seabed echoes is achieved through large and small view field detection of 532 nm wavelength laser echoes, synchronous detection of the sea surface is achieved through 1064 nm echo detection, and therefore the near-coast seabed terrain and a water depth are accurately measured; atmospheric detection is realized through parallel dual-wavelength laser emission and polarization receiving detection; and through multi-beam laser emission and sub-view-field receiving detection, high-efficiency measurement of an ocean wave height and the near-coast land terrain is achieved, the laser radar is carried by a satellite platform, and global-scale near-coast terrain and water depth measurement can be achieved through continuous scanning in a satellite flight direction.

The invention discloses a device and a method for testing thee fastening pressure of a shape memory alloy pipe joint. Two strain gauges are symmetrically adhered to the inner wall of a connected pipe and are connected with a dynamic strain tester. Four steel wire ropes penetrate through a groove of a loading block and fixed pulleys respectively, and weights are loaded at the tail ends of the steel wire ropes. Different pressures pi can be applied to the outer wall of the connected pipe by changing the weight of the loaded weights, and the strains epsilon i which are generated by the strain gauges adhered to the inner wall of the connected pipe under the action of the different pressures are tested through the dynamic strain tester, so that a curve of a calibration relation between the pressure p of the outer wall of the connected pipe and the strain epsilon of the inner wall is obtained. According to the calibration relation, the fastening pressure applied to the connected pipe by the shape memory alloy pipe joint in a heating recovery process can be conveniently tested.