69results about How to "Guaranteed measurement stability" patented technology

The present invention relates to a clamp ring type torque sensor for obtaining drive shaft torque. Said sensor adopts semi-ring design, and said sensor can be quickly clamp-mounted on the drive shaft only by utilizing holt and nut. When the torque is received by drive shaft, the shearing deformation which is directly proportional to the torque on the drive shaft can be transferred to the sensor elastic body on which a strain foil is stuck so as to obtain the torque signal of said drive shaft. Said invention also provides the design method of said sensor elastic body.

The invention provides a measuring method of tunnel shield posture, comprising the following steps: 1. respectively arranging a theodolite, a prism, a front ruler and a rear ruler; 2. calculating the design coordinates of the front ruler and the rear ruler according to the design coordinates of the head part and the tail part of a shield machine and the relative position among the front ruler, the rear ruler and the shield machine, and calculating the design included angles alphafront of the prism, the theodolite and the front ruler and the included angles alpharear of the prism, the theodolite and the rear ruler; 3. using the theodolite to respectively measure the included angles betafront of the prism, the theodolite and the front ruler and the included angles betarear of the prism, thetheodolite and the rear ruler; 4. according to the design coordinates of the front ruler and the rear ruler and the coordinates of the theodolite, calculating the distance Sfront between the front ruler and the theodolite and the distance Srear between the rear ruler and the theodolite; 5. calculating the plane deviation of the front ruler and the rear ruler; 6. and according to the plane deviation of the front ruler and the rear ruler, calculating the plane deviation of the head part and the tail part of the shield machine in horizontal direction. The invention improves measurement precision, simplifies measurement process and greatly saves engineering cost.

The invention discloses a laser-oriented control system and method for a shield machine. The method comprises the following steps: measuring the coordinate of a prism under a ground coordinate system in the shield machine by a laser total station instrument; determining the attitude parameter of the shield machine by a laser receiving target and a sensor; calculating the coordinates of a tool bit centre point, a middle folding point of the shield machine and a shield tail centre point under the ground coordinate system by a controller; determining the axial offset amount of the tool bit centre point, the middle folding point of the shield machine and the shield tail centre point relative to a tunneling plan line; revising and fitting the tunneling curve of the shield machine by the controller; and controlling the shield machine to tunnel by the controller. According to the technical scheme disclosed by the invention, the degree of automation and the construction efficiency of the traditional control survey system are greatly improved on the premise of guaranteeing the measurement precision and stability, and the engineering expenditure can be greatly saved.

The invention relates to a temperature detecting and self-cleaning cooling device for arc fuse wire additive manufacturing. The device comprises a printing device, a printing welding system, a machinetool moving system, a welding gun head, a non-contact type infrared thermometer, a cooling system, a self-cleaning system, and a central control system; the device is simple in structure, the temperature measuring position is accurate, accurate detection and control of interlayer-temperature of overlaying coatings obtained through equal arc additive manufacturing can be achieved, closed loop control is achieved, the forming size precision and quality of the arc additive manufacturing can be improved, the protection and cleaning of the temperature measuring device can be considered, the measuring precision or stability of the temperature measuring device can be ensured, equipment long-term continuous running is ensured while the printing efficiency is improved, in addition, the control over the printing layer temperature of a printing part is considered, the defect of the heat conduction manner and the cooling manner is overcome, a cooling system is used for rapidly cooling to determine continuous operation of a large structural part printing process, the printing intermittent cooling time is greatly shortened, and the printing efficiency is greatly improved.

The invention discloses a nanoparticle measurement device and method. The nanoparticle measurement device comprises a sample cell which is horizontally arranged, wherein a charge coupled device (CCD) microscope is arranged above the sample cell; the CCD microscope is connected with a computer; a semiconductor laser is arranged below the sample cell; and an inclined angle of 10 to 80 degrees is formed between the semiconductor laser and the sample cell. According to the nanoparticle measurement device and method, the semiconductor laser is arranged on the CCD microscope, and a certain inclined angle is formed between the semiconductor laser and the sample cell, so that the nanoparticles in the sample cell generate dynamic scattered light spots under irradiation of laser beams, the particle size and particle size distribution of the particles from dozens of nanometers to several nanometers are measured according to the Brownian motion equation proposed by Einstein; and therefore, the measurement precision and stability can be guaranteed, the production cost can be greatly reduced, and the nanoparticle measurement device is simple in structure and easy to popularize and use.

The invention provides a through shaft type tension sensor. The through shaft type tension sensor is characterized in that a bearing bracket is arranged in a shell; self-aligning bearings are arranged in the bearing bracket; two lugs are arranged outside the bearing bracket; the section shapes of the lugs are any one of isosceles trapezoid, large semicircle, half waist circle and half oval; two matched clamp slots and a strain beam connected with the bearing bracket and the shell are formed in the shell; resistance strain gauges R1-R4 are arranged on the strain beam; the section shape of the strain beam is rectangular; an output interface is arranged outside the shell and is communicated with the interior of the shell; a control circuit comprises the resistance strain gauges R1-R4, a zero temperature compensation resistor Rt, a zero output compensation resistor Rz, an input consistency compensation resistor Ri, two parallel sensitivity output compensation resistors RL and two parallel sensitivity temperature compensation resistors Rb; a power line and an output signal line of the control circuit are laid in the shell and are connected with the output interface; inner and outer side plates are arranged at the two axial sides of the shell. The sensor has high precision, good stability and long service life.

The invention relates to the field of dew point temperature measurement, and particularly relates to a chilled-mirror dew-point hygrometer capable of quickly measuring an extremely low dew point. Thechilled-mirror dew-point hygrometer comprises a gas path system, a light path system, a refrigerating system and a control system, wherein the gas path system comprises a test cavity, a sampling pipeline and an auxiliary humidifying unit, the auxiliary humidifying unit comprises a humidifying pipeline and an electromagnetic valve, and two ends of the humidifying pipeline are connected to two openings of the sampling pipeline; the light path system comprises a transmitting light source, a mirror surface and a photosensitive receiver, the mirror surface is located in the test cavity, the transmitting light source irradiates the mirror surface, and reflected light is received by the photosensitive receiver; the refrigerating system comprises a semiconductor refrigerator and a compressor refrigerator for performing pre-refrigeration treatment on the semiconductor refrigerator, the cold end of the semiconductor refrigerator is connected to the bottom of the mirror surface, and the hot end of the semiconductor refrigerator is mounted on an evaporator of the compressor refrigerator; and the control system is electrically connected with the gas path system, the light path system and the refrigerating system. The chilled-mirror dew-point hygrometer can measure an extremely low dew point, and is high in measurement speed, high in accuracy and high in stability.

The invention discloses a metal rotor flowmeter with a rectification function. The metal rotor flowmeter comprises a pipe body, a rotor sleeve, a rotor, an upper stop and a lower stop. A guiding hole allowing the rotor to extend therein is arranged at the center of the lower stop, the periphery of the guiding hole is provided with at least one ring of a plurality of sieving apertures enclosing a circumference, and a heightening boss is additionally arranged between the guiding hole and somewhere nearby the ring of the sieving apertures. According to the invention, a dense grid plate structure with multiple small circular holes in uniform circumferential distribution is employed, under the condition that the accumulated flow passage area of all the small holes is not decreased, current stabilization effect is applied on a fluid, when the fluid passes through such throttling members as a bend, a valve, a reducing pipe and the like, instability is caused to the flow field of the fluid due to the effect of the throttling members, and after passing through a porous current-limiting orifice plate, the fluid is rectified again, such that the requirement of the metal rotor flowmeter for a straight pipe segment is lowered, and the working condition adaptation scope of the metal rotor flowmeter is enlarged under the condition that the measurement stability is enhanced.

The invention discloses an underwater temperature remote-sensing measurement method. The method comprises the steps that S1, a scattering spectrogram of Rayleigh-Brillouin scattering of a to-be-measured water area is acquired; S2, multiple groups of equal-signal-to-noise-ratio scattering spectrograms with equal signal-to-noise ratios are selected, and a Brillouin line width average value and a Brillouin frequency shift average value of the multiple groups of equal-signal-to-noise-ratio scattering spectrograms are calculated; and S3, the Brillouin line width average value or the Brillouin frequency shift average value is utilized to perform temperature retrieval, and the temperature of the to-be-measured water area is obtained. The underwater temperature remote-sensing measurement method has high precision and high instantaneity.

The invention discloses a laser-oriented control system and method for a shield machine. The method comprises the following steps: measuring the coordinate of a prism under a ground coordinate system in the shield machine by a laser total station instrument; determining the attitude parameter of the shield machine by a laser receiving target and a sensor; calculating the coordinates of a tool bit centre point, a middle folding point of the shield machine and a shield tail centre point under the ground coordinate system by a controller; determining the axial offset amount of the tool bit centre point, the middle folding point of the shield machine and the shield tail centre point relative to a tunneling plan line; revising and fitting the tunneling curve of the shield machine by the controller; and controlling the shield machine to tunnel by the controller. According to the technical scheme disclosed by the invention, the degree of automation and the construction efficiency of the traditional control survey system are greatly improved on the premise of guaranteeing the measurement precision and stability, and the engineering expenditure can be greatly saved.

The invention discloses a single photon pulse arrival time detecting device. The device comprises a signal acquisition circuit, an FPGA processing module and a storage module. A single photon detecting device and a signal amplifying circuit convert an optical signal into a digital pulse signal which is collected by the FPGA processing module. In the acquisition of the single photon pulse signal, aserial-to-parallel conversion method is adopted to reduce the operating frequency of a data analysis module, the collected pulse data is analyzed by means of an assembly line, a multi-stage circuit simultaneously processes the data to achieve acquisition, analysis and storage, and the device greatly shortens the clock cycle required for the work, reduces the time taken for the entire process, andgreatly improves the efficiency.

The invention provides a multifunctional real-time detection device for the road and bridge concrete structure; the device comprises a cross beam, supporting frames, a rack, a moving rod, moving trundles, a control panel, a dust collection box, a dust collection core, supporting pipes, a cleaning box cover and an exhaust net, and the cross beam is transversely connected to the upper end between the supporting frames through bolts; the longitudinal lower ends of the supporting frames are connected to the left side and the right side of the upper portion of the rack through bolts. Through arrangement of cleaning bristles, a cleaning disc, a buffer spring, a rotating disc, a dismounting pipe, a cleaning motor and a quick dismounting bolt, cleaning of the surfaces of roads and bridges is facilitated, real-time detection is facilitated, the cleaning motor drives the dismounting pipe to rotate, and the rotating disc drives the cleaning disc to rotate through the buffer spring; therefore, the surface of the road bridge can be cleaned through the cleaning bristles, inaccurate visual inspection caused by dust coverage is avoided, cracks or cracks on the surface of the road bridge can be clearly determined, and marking and repairing are facilitated.

The invention belongs to aviation measurement technology, and relates to a flutter model center of gravity positioner. The flutter model center of gravity positioner is characterized by comprising a bearing framework, two level meters (7), a center of gravity positioning assembly (8), two model spacing assemblies (9) and a center of gravity locating lever (10). The flutter model center of gravitypositioner has the characteristics of a small error of a measured value and small discreteness. By utilizing a static balance principle and a model spacing device to restricting degree of freedom of model rotation, by utilizing the center of gravity locating lever to substitute a plumb, measurement stability is effectively guaranteed.