36results about How to "Guaranteed linear relationship" patented technology

The invention discloses a fiber grating displacement meter. The displacement meter comprises anchor flukes, connecting pieces, elastic pieces, sensors, cantilever beams and a casing, wherein the casing is fixed to the bottom surface of a top plate; holes are formed in the top plate and go deep into a rock mass; the anchor flukes are fixed to the base points of the holes and are connected with the free ends of the cantilever beams through the connecting pieces and the elastic pieces; the other ends, which are opposite to the free ends, of the cantilever beams are fixed ends; the fixed ends are fixed on the casing; and the sensors are stuck to the cantilever beams. The displacement meter provided by the invention has a wide application range, can be applied to top plate sinkage monitoring for various tunnel projects and subway projects and can ensure measuring accuracy.

The invention relates to a seismic prospecting technology which is a method of determining a carbonate reservoir structure. The concrete steps are as follows: wave field reconstruction parameters are obtained by using a field observation system; type parameters corresponding to an underground geological structure are obtained by processing data, a discrete strata property model is established; wave field values on various discrete mesh points at each moment are reconstructed, and wave fields of the positions where a detection point is positioned at each moment are taken as a wave field reconstruction record; and sections obtained by the wave field reconstruction are compared with stacked and migrated sections obtained by processing the field acquisition data to determine the distribution, and the fracture development direction and the development degree of an underground carbonate reservoir. The technology is applicable to the wave field reconstruction of any completed structure, has the ability of determining underground oil-gas reservoir structures, and has the characteristics of high accuracy, high efficiency, low frequency dispersion and improving the calculation efficiency.

A modularized atomic energy microscope is disclosed, comprising seven modules. The first one is stepper motor the second is sample support with four-dimensional adjustment fixed on stepper motor, the third is z direction scanner, the fourth consists of microbracket needle point and focusing lens, the fifth is xy direction scanner, the sixth consists of semiconductor laser with focusing lens, reflector, imaging lens and four-quadrant photoelectric sensor, the seventh consists of optical microscope, CCD camera, monitor. The invention has convenient adjustment and replacement to modularized atomic energy microscope, and using each module to construct atomic energy microscope with different structure is easy and sample has function of coarse positioning.

The invention relates to a double-trailing arm type steering independent suspension for an electric bus driven by wheel-side motors. The double-trailing arm type steering independent suspension comprises a left suspension, a right suspension, steering linkages, a steering rocker arm, an angle sensor and a steering actuating cylinder. According to the double-trailing arm type steering independent suspension disclosed by the invention, drive motors are arranged at wheel positions of the bus; each drive motor is located on the side of an output shaft of each of speed reducers; each speed reducer is fixed to each of supporting arms; the output shaft of each speed reducer penetrates through a center hole of each supporting arm and is connected with each of wheel-side structures of the bus, and a wheel of each wheel-side structure is driven to rotate, so that the driving to the bus is realized; the supporting arms are designed with high load-bearing performance to replace a conventional supporting arm structure, so that a shock absorber and a steering mechanism can be directly connected with the supporting arms, the steering and the locking of the bus are facilitated, and beside, the purposes of increasing the interior space of the bus and reducing the height of a bus floor can be realized.

The invention discloses a micro-electro-mechanical system platform, including a platform main body, an optical detection mechanism and an external packaging plate. The platform main body comprises a vibration platform. The external packaging plate forms a confined space, and the platform main body and the optical detection mechanism are enclosed in the sealed space. The optical detection mechanism includes a laser, a reflector and a diode array. The reflector is horizontally fixed to the top of the vibration platform with the mirror facing the top of the external packaging plate. The laser and the diode array are located inside the top of the external packaging board, and the diode array includes a plurality of photodiodes. The diode array encloses the laser. The light emitted from the laser is irradiated onto the reflector and the reflected light formed by the reflection of the reflector is irradiated onto the diode array. The diode array detects the light intensity of the reflected light. The micro-electro-mechanical system platform improves the linearity of the measurement result and improves the detection precision.

The invention discloses a triaxial quartz flexure accelerometer small-size signal sampling device comprising an accelerometer. The device also comprises a signal collection mechanism that comprises apre-amplification module, a switch module, a differential amplification module, an AD conversion module and a controller-integrated FPGA main control module which are sequentially connected with the accelerometer in series; and the switch module is also connected with the FPGA main control module. By using the triaxial quartz flexure accelerometer small-size signal sampling device adopting the abovementioned structure provided by the invention, a digital sub-system substrate and an analog sub-system substrate are perpendicularly interconnected via solder balls, so that the whole size is reduced, the miniaturization is achieved; meanwhile, by using the FPGA main control module, the collection and conversion from an accelerometer analog signal to a digital signal are achieved, the linear relation between the output digital signal and the acceleration signal is ensured, and the stability of zero and scale can be ensured, so that the performance of the header of the accelerometer is furthest ensured.

The invention discloses a capacitive liquid level sensor and a manufacturing method thereof. The liquid level sensor comprises a surface PDMS layer, a Si structure layer and a bottom glass layer, wherein the Si structure layer and electrodes are obtained through a process combining DRIE dry etching and wet etching; a closed liquid cavity is formed through ion bonding and the PDMS layer, and the change of electrolyte between capacitance polar plates is caused by the change of the liquid level, so that the electric charge between the capacitance polar plates is changed; the change of the liquid level between the polar plates can be detected through a peripheral circuit. Due to the fact that the distances are equal everywhere, the volume of the liquid between the polar plates can be calculated accurately and directly; the second embodiment of invention can achieve accurate monitoring of the characteristic liquid level, and overall continuous observation can be achieved. The liquid sensor has the advantages of being sensitive in reaction, low in manufacturing cost, high in precision and the like.

The invention discloses a distribution method of third-order intermodulation distortion parameters applied inside a receiver radio-frequency system circuit, which belongs to the technical field of electromagnetic compatibility. The distribution method comprises the following steps: firstly processing the overall receiving performance index of a receiver radio-frequency system according to nonparasitic response to obtain a threshold voltage; then computing the total distortion voltage of third-order intermodulation distortion in each level of sub circuit, which is about to enter a received passband according to constraint relation; and finally obtaining the third-order cut-off point of each level of sub circuit according to the relation that the total distortion voltage is smaller than and equal to the threshold voltage. The method of the invention realizes the distribution of the third-order intermodulation distortion parameters of each level of sub circuit under the condition of cascade circuit voltage signal in-phase, thereby the problem of poor communication quality caused by overlarge third-order intermodulation distortion signal interference of the receiver radio-frequency system is solved.

The invention relates to a fluid proportioning valve with a pressure balancing device and an application thereof. The fluid proportioning valve comprises a shell, wherein a first valve cavity and a second valve cavity which are connected are formed in the shell; a pressure balancing unit is arranged in the first valve cavity; a center valve body and a center valve core are arranged in the second valve cavity; a valve body inlet A and a valve body inlet B are formed in the center valve body; a valve core inlet A and a valve core inlet B which are respectively matched with the valve body inlet A and the valve body inlet B are formed in the center valve core; and the flow areas of fluid A and fluid B are adjusted by rotating the angle of the center valve core in the center valve body, further the proportioning of the two fluids is adjusted, and the outflow of mixed fluid is adjusted by linear displacement of the center valve core. The fluid proportioning valve can set the volume ratio of the fluids after mixing at random, meanwhile can adjust the outflow of the mixed fluid and is relatively high in efficiency and good in timeliness.

The invention provides a device and method for testing the drag reduction performance of a super-hydrophobic surface and belongs to the technical field of surface drag reduction performance testing. The problems that existing super-hydrophobic surface drag reduction performance test is low in accuracy, limited in use, high in cost, complex in test process and poor in temperature characteristic aresolved. The device of the invention comprises a water tank, a test flow channel mechanism, a frictional resistance detection mechanism and a data processing mechanism, wherein the test flow channel mechanism is formed by sequentially connecting a water tank outlet, a water pump, a throttle valve, a flow meter and a spray pipe through a water flow pipeline; the frictional resistance detection mechanism comprises an elastic unit, a lever, a hinge and a displacement sensor; and the displacement sensor is in communication connection with the data processing mechanism. The device and method are mainly used for testing the drag reduction performance of the super-hydrophobic surface.

The invention relates to the technical field of mobile communication 3G/4G power amplifiers. A design method that a Doherty PA (power amplifier) and a Cartesian feedback loop are combined is adopted, and respective advantages of the Doherty PA and the Cartesian feedback loop are combined. When an input signal is a 3G/4G signal of which the peak average is higher, the system efficiency can be greatly improved by the Doherty PA, and the problems of EVM, ACPR and the like brought by the non-linear distortion of the Doherty PA are corrected by the Cartesian feedback loop, and therefore the communication system provided by the invention exceeds a traditional system in two aspects of linearity and power efficiency.

The invention discloses a sampling hold circuit, an analog-to-digital converter and a wifi chip. The sampling hold circuit comprises a clock generation sub-circuit, a grid voltage bootstrap sub-circuit and a sampling field effect transistor; the grid voltage bootstrap sub-circuit outputs a second control signal to a grid electrode of the sampling field effect transistor, the voltage is the sum of the conduction voltage and the input voltage of the signal input end, and the conduction voltage is greater than the input voltage of an external power supply. The circuit does not introduce non-ideal harmonic waves, eliminates the interference of the input voltage of the signal input end on the sampling field effect transistor, does not generate negative influence on the output signal-to-noise ratio of the analog-to-digital converter, reduces the on-resistance of the sampling field effect transistor, and improves the response speed of the switch; the strict linear relation between the input signal and the output signal of the sampling hold circuit is guaranteed, and the performance of the circuit is improved.

The invention discloses a double-wheel hub electric vehicle Hall differential control system. The system comprises a control circuit power supply, an electric vehicle pedal governor, a left wheel hubmotor controller, a right wheel hub motor controller and an electric vehicle differential controller, the differential controller is internally sequentially fixedly connected with magnetic steel A, magnetic steel O and magnetic steel B, racks are arranged on the sides of the magnetic steel A, the magnetic steel O and the magnetic steel B, the ends of the racks are fixed to left Hall elements, theother ends are fixed to right Hall elements, the left Hall elements are located between the magnetic steel A and the magnetic steel O, the right Hall elements are located between the magnetic steel Oand the magnetic steel B, and the racks and a driving rotating shaft of a steering system of the electric vehicle are in drive connection. According to the above structure, the double-wheel hub electric vehicle Hall differential control system changes the distance between the Hall elements and the magnetic steel on the racks by the movement of the racks to change the intensity of the magnetic field of the magnetic steel on the Hall elements, and forms the output voltage inverse linear change of the Hall elements at both ends.