12results about How to "Large range" patented technology

This invention discloses a fiber Bragg grating level sensor based on liquid pressure conversion, comprising a fiber Bragg grating demodulator, a 2×1 fiber coupler, a transmission fiber, and a sensing unit. The sensing unit consists of a strain-sensing fiber Bragg grating, a temperature-compensated fiber Bragg grating, a sealed cylinder, a support beam, a pressure block, a pressure tension frame, a sealing membrane, and a stop. The pressure block and the pressure tension frame convert liquid level changes into longitudinal displacement changes, causing axial strain in the strain-sensing fiber Bragg grating. This results in a drift in the center wavelength of the strain-sensing fiber Bragg grating, and the liquid level height of the container is measured by monitoring this wavelength change. This invention eliminates the influence of temperature on the liquid level measurement results through a temperature-compensated fiber Bragg grating, offering advantages such as a large measurement range, good practicality, simple structure, low cost, good stability, high sensitivity, and safety and reliability, meeting the needs of measuring liquid levels in large storage tanks and other applications.

This invention provides a differential probe dual-color laser frequency stabilization method and system with multiple interactions of coexisting Lamb-dips and Lamb-peaks. Based on the multiple interactions between a multi-frequency laser and a quantum resonance system in a Doppler-free configuration, by setting the relative polarization directions and Raman phases of the pump and probe beams that propagate in opposite directions and coincidentally, resonance signals in the form of coexisting Lamb-dips and Lamb-peaks are obtained. Subtracting these two signals yields a quantum resonance signal with Doppler-free broadening eliminated. This invention obtains a Doppler-free spectral signal with coexisting Lamb-dips and Lamb-peaks and improved contrast, ultimately resulting in a significantly improved signal-to-noise ratio of the Doppler-free quantum resonance signal. This signal can be used for precise spectral measurements and laser frequency stabilization, enabling compact, miniaturized laser sources with ultra-low frequency noise. The system's size and power consumption are greatly reduced, while robustness is improved, resulting in a higher signal-to-noise ratio resonance signal and achieving ultra-high-performance laser frequency stabilization.

The application discloses a bipolar square wave excitation generation and conductivity detection circuit, a direct current bias square wave generation circuit can generate direct current bias square wave excitation signals with different frequencies; a direct current bias generation circuit generates a direct current voltage excitation; the direct current bias of the direct current bias square wave is equivalent to the size of the direct current voltage, and two signals are superposed to form a bipolar square wave excitation signal. An internal reference voltage output by an ADC is used as a voltage source of the direct current bias square wave generation circuit and the direct current bias voltage generation circuit; a node voltage of an ADC acquisition circuit is collected, so that the conductivity and temperature of a medium to be measured are obtained. The excitation and detection mode provided by the application ensures that all circuit voltages are positive voltages, simplifies the structure of the excitation and sampling circuit, is high in measurement accuracy, stable in measurement, low in power consumption and capable of meeting long-term online monitoring requirements.

The application discloses a kind of foam-based flexible tactile sensor and its preparation method, the flexible tactile sensor has three-layer structure, middle layer is PEDOT:pss / rGO composite foam, the composite foam is tactile sensing material, and the upper and lower layers are both flexible PDMS film;The application uses simple and efficient hydrothermal synthesis method and subsequent flash instantaneous irradiation reduction method, and prepares a kind of three-dimensional porous PEDOT:pss / rGO composite foam, can effectively and maximumly keep the composite skeleton structure of original PEDOT:pss / GO foam, and makes PEDOT:pss polymer polymer and rGO sheet closely connected, so that PEDOT:pss / rGO composite foam has better mechanical elasticity and high conductivity, so that flexible tactile sensor has high sensitivity, ultra-low detection lower limit, short response time and good stability and other excellent performance, widely used in human health, motion monitoring and other fields.

The utility model relates to the field of building engineering quality detection discloses a concrete crack depth measuring scale, including main ruler and vice ruler, the surface of main ruler is equipped with vernier caliper, the bottom of vice ruler is provided with connecting assembly, the connecting assembly includes control rod and square frame, the control rod slidingly connects on the inner wall of main ruler, the bottom fixed connection of control rod has pull rope, the one end fixed connection of pull rope away from control rod has the clamping block, the clamping block is elastically connected with the inner wall of vice ruler through reset spring, the bottom of vice ruler is provided with the protruding portion. In the utility model, through setting connecting assembly, realize the quick locking and connection of vice ruler and main ruler, need not external tool to complete fixed, thereby increase the range of measuring scale, and at the end of use, through pulling control rod, separate main ruler and vice ruler, thereby reduce the overall length of measuring scale, and further convenient to carry, improved the portability of measuring scale.

The application discloses a universal pressure sensor, which comprises a pressure seat provided with a measuring hole at the bottom end, and a shell fixedly connected with the top edge of the pressure seat at the bottom end, wherein the top end of the pressure seat is provided with a limiting groove, the opening of the shell is downwardly arranged, the top end of the pressure seat and the inner wall of the shell enclose a cavity, the top end of the pressure seat is fixedly provided with a binding plate and a strain gauge, the binding plate is provided with mounting holes and limiting holes, the strain gauge is arranged in the mounting hole, a metal wire is arranged between the strain gauge and the binding plate, a compensation plate is arranged above the binding plate and fixedly connected with the binding plate through a support, the lower end of the support is provided with a limiting block and a containing cavity, the limiting block is inserted into the limiting groove through the limiting hole, the opening of the containing cavity is downwardly arranged to contain the strain gauge and the metal wire, and a plurality of vertical wires are fixedly connected with the compensation plate. The application improves the overload capacity and the sealing performance of the pressure sensor and expands the range of the pressure sensor.

The invention relates to a sensor for measuring the hydrogen content in water. The sensor comprises a detection cavity, and a hydrogen permeation membrane, a reference motor shell, a reference electrode, a signal acquisition circuit, a working electrode, a glass tube and a counter electrode which are arranged in the detection cavity. The glass tube is located outside the working electrode, and the axis of the working electrode coincides with the axis of the glass tube. The counter electrode is located outside the glass tube, and the axis of the counter electrode coincides with the axis of the glass tube. The reference electrode is positioned on the opposite side of the working electrode, the glass tube and the counter electrode. The reference electrode shell is located outside the reference electrode, and the reference motor shell and the reference electrode coincide in axis. And the signal acquisition circuit is positioned below the reference motor shell, the reference electrode, the working electrode, the glass tube and the counter electrode. All detection devices are integrated in the detection cavity, so that the technical problem that online water quality detection cannot be realized by a dissolved hydrogen content detection method is solved.

The embodiment of the present application provides a piezoelectric sensor, which comprises a first pressing plate, a second pressing plate, a fixing assembly and a plurality of piezoelectric components. The second pressing plate is located on one side of the first pressing plate along a first direction, the piezoelectric components are arranged between the first pressing plate and the second pressing plate, and at least two piezoelectric components are located in the same plane perpendicular to the first direction. The fixing assembly is connected with the first pressing plate, the piezoelectric components and the second pressing plate respectively. The piezoelectric sensor can greatly improve the range.

The application belongs to the technical field of chemical analysis and detection, and relates to a synthesis method of an MXene-based nanoenzyme composite and application of the MXene-based nanoenzyme composite in detection of organophosphorus pesticides. V2CTx MXene and Fe-TCPP can be used to prepare V-TCPP(Fe) materials through a simple solvothermal method, and V-TCPP(Fe), AChE, 2-methylimidazole and zinc nitrate can be stirred at room temperature to prepare V-TCPP(Fe) / AChE@ZIF-8 materials. PVA, sucrose and V-TCPP(Fe) / AChE@ZIF-8 can be mixed and stirred to prepare a hydrogel patch. The material has a good colorimetric / chemiluminescence linear range response to OPs. The material is simple and convenient to prepare, and has the advantages of high sensitivity, a large linear range, good stability and repeatability in detection of OPs.

The invention belongs to the technical field of performance improvement of micro-electro-mechanical accelerometers, and provides a multi-bit micro-electro-mechanical accelerometer. Comprising a meter head sensitive structure, a CV conversion circuit, a first-order control circuit, a multi-bit quantizer, a torquer coefficient module and an acceleration conversion module, and an input acceleration signal and a feedback acceleration signal are subtracted and then input to the meter head sensitive structure; the output end of the gauge head sensitive structure is connected with the input end of the CV conversion circuit; the output end of the CV conversion circuit is connected with the feed-forward input end of the first-order control circuit, and the output end of the first-order control circuit is connected with the input end of the multi-bit quantizer; the output end of the multi-bit quantizer is connected with the feedback input end of the first-order control circuit and the input end of the torquer coefficient module; the output end of the torquer coefficient module is connected with the input end of the acceleration conversion module, the acceleration conversion module outputs feedback acceleration signals, and the front end of the gauge head sensitive structure is provided with multiple pairs of feedback electrodes corresponding to multiple bits.

This invention discloses a micro-thrust measurement device and method. The micro-thrust measurement device includes a working base plate, a pivot and fixing module, a three-axis displacement stage, a torsion beam, a linear guide rail, a displacement sensor, a micro-thrust generator, and a counterweight. The linear guide rail is mounted on the working base plate and consists of a long guide rail and a short guide rail. The torsion beam is positioned between the long and short guide rails. Slider blocks are installed at the ends of both the long and short guide rails furthest from the torsion beam. The slider of the long guide rail houses a micro-thrust motor for measuring the micro-thrust, while the slider of the short guide rail houses a counterweight. The displacement sensor and the micro-thrust generator are respectively located on both sides of the long guide rail. The three-axis displacement stage is mounted on the torsion beam via the pivot and fixing module. This invention enables sub-millinewton-level micro-thrust testing of micro- and nano-satellite micro-propulsion systems. It is easy to operate, improves measurement accuracy, increases the measurement range of the testing system, and reduces costs.

The utility model relates to a kind of gas density relay and its microswitch trigger device, in the process that press column presses the button of microswitch downwards, the initial contact end of the lower end of press bar first contacts button and starts to press button;Then, transition extrusion surface contacts button and further press button to button;Finally, when button is pressed to place and triggers microswitch to produce signal with the contact of the retaining contact surface and button, since retaining contact surface is parallel to the movement direction of press bar, when press bar continues to move downwards, the retaining contact surface keeps the press amount of button unchanged, and button will not be damaged by transition pressing. Such design can make press column have larger stroke without damaging microswitch, and press column will not trigger microswitch to produce signal due to vibration, and the vibration resistance of density relay is stronger;In addition, since press column can have larger stroke, bellows assembly can adapt to larger gas density variation range, and density relay can also have larger range.