18results about How to "High measurement sensitivity" patented technology

This invention discloses an insulating encapsulation structure and connection method for a probe temperature sensor, relating to the field of temperature sensor technology. The insulating connection bracket has an outer insulating and thermally conductive protective layer, and contains insulating adhesive and a temperature-sensing component. The specific implementation is as follows: an insulating layer assembly, a built-in snap-fit ​​structure within the insulating connection bracket, and an eccentric cavity for housing the temperature-sensing component. A thermistor glass body is used as the insulator. In the insulation process, direct contact between the glass body and the inner wall of the bracket reduces one useless insulating layer. The cavity formed by the end of the insulating connection bracket and the insulating layer assembly houses the temperature-sensing component. The cavity contains a clearance structure for the thermistor pins and multiple layers of insulation between the pins and the conductive copper wires. A fluid insulating adhesive is used, and then the insulating connection is cured. Finally, the encapsulation is placed inside a metal shell containing insulating adhesive and cured, thus forming multiple layers of effective insulation and sufficient safe insulation thickness between the thermistor conductive pins and the metal shell.

The application aims to provide a biaxial anisotropic material dielectric constant temperature variation test system and method, and belongs to the technical field of microwave and millimeter wave test. The system innovatively designs a free space terminal short circuit test system, realizes the acquisition of S21 parameters of microwave materials under high temperature through symmetrically arranging two antennas, and inversely obtains electromagnetic parameters based on the S21 parameters. Meanwhile, the test system can rotate the sample and rotate the antenna by 90 degrees, so as to realize the extraction of electromagnetic parameters of isotropic materials and biaxial anisotropic materials under high temperature in a wide frequency band, and has the advantages of large test range, simple detection mode, high measurement precision and the like.

The invention discloses a strong pumping bilateral resonance modulation-demodulation magnetic sensitivity enhancement method of a quantum magnetic compass. The method comprises the following steps: constructing a quantum magnetic compass platform comprising a sensing unit and external optical and microelectronic devices; quantum state enhanced reading containing magnetic vector information is realized by using a pumping enhancement mode; a standard diamond is used, the thermal conductivity and the light transmission of the diamond are utilized, the initialization of a quantum state is realized by using near-saturation external pump light, the line width is narrowed, and the magnetic measurement sensitivity is improved; noise in the environment is filtered out in a modulation and demodulation mode, and high-robustness extraction of quantum information is achieved. By enhancing the laser pumping power, the emission speed of the solid-state quantum color center ensemble fluorescence photons is increased, the full width at half maximum of a magnetic resonance curve is compressed, and the measuring capacity of the solid-state quantum color center to a magnetic field is improved; accurate measurement of external magnetic field signals through the solid quantum color center in the diamond is realized.

The present application relates to shear stress detection technical field, especially to a kind of stress detection device, comprising: first mechanical arm, second mechanical arm, detection component and power component, its first mechanical arm and second mechanical arm are respectively with same rotational speed along opposite rotating directions movement, to the part to be measured is applied a pair of equal, opposite force moment, to twist the part to be measured;Detection component is used to detect the torque generated by the part to be measured twisted by first mechanical arm and second mechanical arm.This application is by first mechanical arm and second mechanical arm with same rotational speed, opposite direction to part exert torque load, while with the flexible detection band and the strain matrix on it that adhere to the surface of part, real-time acquisition and processing the multidimensional torsional stress generated by part surface in the process of twisting, realize the directional, real-time detection of torsional stress.

This invention provides an IGBT device. A temperature sensor is integrated on one side of the cell region within the IGBT device to monitor the device's actual temperature in real time. Multiple diodes are connected in series within the temperature sensor to amplify the temperature sensing signal, improving measurement accuracy and sensitivity, and enhancing the anti-interference capability of the temperature sensing. Each diode is located on the field oxide layer to achieve electrical isolation. Furthermore, the field oxide layer has a specific size to prevent high-voltage breakdown and enhance device reliability. Each diode also has an N-type doped region and a P-type doped region; the N-type and P-type doped regions are respectively connected to metal plugs for electrode leads. Furthermore, the metal plugs are of a specific size to reduce contact resistance and further enhance device performance.

The invention discloses a relaxation fluctuation suppression method influenced by temperature change of an optical pump atom magnetometer, and the method comprises the following steps: constructing a relaxation noise model influenced by temperature based on the optical pump atom magnetometer, the relaxation noise model comprising a mapping relation between a measurement error of the optical pump atom magnetometer and a gas chamber temperature of an environment where the relaxation noise model is located; based on the mapping relation and the heat transfer principle, an air chamber heating thermal model is constructed, and the air chamber heating thermal model describes the dynamic relation between the heating film input voltage and the air chamber temperature; updating parameters of the air chamber heating thermal model in real time by applying a self-adaptive model predictive control algorithm; on the basis of the updated thermal model parameters, model predictive control algorithm control is executed so as to restrain air chamber temperature fluctuation, and then relaxation fluctuation of atoms in the optical pump atom magnetometer is restrained; the establishment time and overshoot of air chamber heating are effectively reduced, the low-frequency noise level of the optical pump atom magnetometer is reduced, and the measurement sensitivity is improved.

The utility model discloses a multi-point detection fiber bragg grating sensor for soil moisture content. The multi-point detection fiber bragg grating sensor comprises an optical fiber protection tube and a measuring tube assembly, one end of the optical fiber protection tube is connected with the head end of the measuring tube assembly; the measuring pipe assembly comprises a plurality of measuring pipes, and every two adjacent measuring pipes are connected through a heat insulation pipe. Densely distributed optical fibers are arranged in the measuring tube assembly, and optical fiber grating regions are arranged at the positions, corresponding to the measuring tubes, of the densely distributed optical fibers respectively; a heating resistance wire is arranged in each measuring tube; and densely distributed optical fibers led out from the measuring tube assembly and a lead connected with the heating resistance wire are fixed in the optical fiber protection tube. The soil moisture detector can be inserted into soil to detect the moisture content of different positions of the soil at one time, the detected soil cannot be damaged, the measurement precision is high, and the detection process is convenient and fast.

The invention discloses a Raman grating magneto-optical trap gravimeter realized by pulse laser. The Raman grating magneto-optical trap gravimeter comprises a central controller, a coherent laser generator and a grating magneto-optical trap gravimeter, the central controller controls the coherent laser generator and is used for outputting control voltage so as to control operation of the seed light laser, the optical fiber electro-optical modulator, the pulse laser generator, the multi-stage optical fiber amplifier and the optical fiber acousto-optic modulator. The seed light laser outputs continuous laser to be injected into the optical fiber electro-optical modulator; the optical fiber electro-optical modulator adopts a radio frequency signal to modulate input continuous laser and then injects the continuous laser into the pulse laser generator; the pulse laser generator continuously converts laser into short-pulse laser and injects the short-pulse laser into the multi-stage optical fiber amplifier; a frequency doubling crystal after short pulse laser amplification; frequency is increased and converted into the required laser wavelength, the laser wavelength is injected into the optical fiber acousto-optic modulator, and the output of the optical fiber acousto-optic modulator is injected into the grating magneto-optical trap gravimeter. The device is simple in structure and low in cost, and the research, development, production and application cost of the device is reduced.

The invention provides an optical microcavity dispersion measurement method based on dispersion linetype real-time calibration, which is applied to the technical field of microcavity dispersion measurement, and comprises the following steps: converting the position extraction of an optical sideband into the position extraction of a dispersion linetype, and demodulating the optical sideband through a frequency mixer to obtain a sideband harmonic peak of a specific dispersion linetype; adjusting the phase difference between a modulation signal and a demodulation signal of the high-stability radio frequency source, identifying the position of a dispersion line type sideband harmonic peak, and extracting the frequency interval of the sideband harmonic peaks on the two sides of each resonance mode; dynamically calibrating the optical fiber Mach-Zehnder interferometer based on the number of sinusoidal signal cycles in the frequency interval of the dispersion line type sideband resonance peaks on the two sides of each resonance mode to obtain a calibrated Mach-Zehnder interferometer; and generating a dispersion measurement result of the optical microcavity according to the calibrated Mach-Zehnder interferometer interference signal. According to the invention, the dispersion measurement precision and the automation level can be improved.

The invention provides equipment and a method for measuring lodging resistance of rice, and relates to the technical field of agricultural machinery. The equipment comprises a vertical supporting rod and an overturning supporting rod hinged to the lower end of the vertical supporting rod, a thrust measuring part is installed at the hinged position, a straw holding assembly and a lower straw shearing assembly are integrated on the thrust measuring part, and a mass measuring part and a power supply battery are arranged on the vertical supporting rod. The method comprises the following steps: measuring internode breaking strength; selecting rice plants and measuring the height; bundling at a position 20cm away from the ground surface; applying a thrust to incline for 45 degrees, and measuring the thrust; after shearing, weighing the weight of the upper part; and calculating a bending moment and a lodging index. According to the scheme, thrust, weight and shearing parameters are synchronously obtained through an integrated structure, the field test efficiency and data accuracy are improved, manual operation errors are reduced, and the method can be used for evaluating the lodging resistance of rice.

This invention discloses a power supply ripple self-detection system and method based on MCU built-in resources, belonging to the field of embedded system power supply monitoring technology. It addresses the shortcomings of traditional digital oscilloscopes, such as high offline measurement costs and inability to achieve full lifecycle self-diagnosis in embedded systems; insufficient sampling rate of MCU built-in ADCs and susceptibility to DC component saturation; and the reliance of existing comparator solutions on external active components. This invention adopts a core architecture of "AC DC blocking + high-gain amplification + dual threshold scanning + digital counting." All active modules in the system are built into the MCU. Specifically, the AC component of the power supply ripple is separated by a DC blocking capacitor, amplified by a programmable gain amplifier, and then an adjustable threshold is generated using a dual digital-to-analog converter. This threshold controls dual high-speed comparators to scan and obtain peak and trough values ​​to calculate the peak-to-peak value, and the period is measured by an internal counter. This invention also supports zero-point calibration, gain adaptation, and online early warning, making it suitable for real-time power health monitoring in industrial control and other fields.

This application discloses an optical acoustic wave measurement device, including a laser source, a frequency modulator, a circulator, a photodetector, an analog-to-digital converter, a microcontroller, a negative feedback unit, a digital-to-analog converter, an amplification and filtering unit, a collimator, and a resonant cavity. This application continuously modulates the output laser to generate a high-frequency carrier signal. The high-frequency carrier signal is used to shift the acoustic signal to be measured to a high frequency, avoiding interference from external noise during the measurement process. Finally, the acoustic signal to be measured is extracted from the carrier signal. This application uses a carrier wave to modulate the acoustic signal to be measured to an intermediate frequency, increasing measurement sensitivity and reducing interference from external noise. Simultaneously, a digital signal processing unit is used to perform signal analysis, resulting in a simple structure, strong adaptability, and strong anti-interference capability. Furthermore, the entire optical system is built using fiber optic devices, resulting in low loss and strong anti-interference capability.

This invention discloses a single-component cantilever beam strain gauge for friction measurement, relating to the field of wind tunnel testing technology. It includes: a model end with a mounting platform that mates with the measurement surface; a single-component torque measuring element connected to the model end via a torque transmission element; and a fixed end at the end of the single-component torque measuring element for connection to a protective cover of the balance. A floating end for torque transmission transition is also provided between the torque transmission element and the single-component torque measuring element. The single-component torque measuring element is spatially located below the floating end, resulting in an eccentric spatial arrangement between the single-component torque measuring element and the measurement surface. This invention innovatively uses a cantilever beam structure in the friction measurement direction, resulting in an eccentric spatial arrangement between the measuring element and the measurement surface, enhancing the balance's measurement sensitivity. Furthermore, the overall structure is simple and easy to manufacture, thus offering the advantage of controllable cost.

The utility model belongs to gas density measurement technical field, especially relates to a kind of anti-explosion gas density gauge. Including: pressure sensing chamber, it is laid in the outside of the shell, and with the inner chamber of the shell is communicated;Pressure sensing diaphragm, its edge end is fixedly sealed with the inner wall of the pressure sensing chamber, axial end bottom is equipped with mandrel, the mandrel is slidably inserted in shaft hole and extends to the lead-through chamber of outside, wherein the shaft hole is opened in the bottom of the pressure sensing chamber, the lead-through chamber is laid in the bottom of the pressure sensing chamber;Spring, it is sleeved on the mandrel, and the upper end of the spring is connected with the pressure sensing chamber, lower end is connected with lead-through plate, the lead-through plate is connected with the lower end of the mandrel, the inner chamber bottom of the lead-through chamber still includes the touch switch of setting. The utility model is pushed by pressure sensing diaphragm and makes lead-through plate and touch switch touch, so that its pressure relief valve opens to carry out timely pressure relief, reach the function of self pressure relief explosion-proof.

The utility model provides a tension detection device, which comprises a sleeve, a sensor body and a force sensor, the force sensor is mounted on the sensor body, one end of the force sensor is inserted into the sleeve, and a measuring end of the other end of the sensor body is arranged outside the sleeve and used for bearing external force. The sleeve and the sensor body are fastened by using the locking device, and the contact point of the locking device and the sensor body is used as a fulcrum to form a lever structure, so that the external force detected by the measuring end can be amplified when being transmitted to the stress end through the lever structure, thereby realizing the detection of the tension. And the change of tiny tension can be sensed more accurately.

This invention discloses a thermometer fixture suitable for transient processes in cryogenic systems, comprising a front guide tube, a rear guide tube, and a temperature measuring block with a temperature sensor mounting interface. The first end of the front guide tube and the first end of the rear guide tube are respectively connected to process piping, and the second ends of the front guide tube and the rear guide tube are respectively connected to the temperature measuring block. A heat exchange channel is formed inside the temperature measuring block, which communicates with the internal channels of the front and rear guide tubes to form a through-flow fluid channel. The fluid being measured can flow through the heat exchange channel and exchange heat with the temperature measuring block. This invention employs a through-flow structural design, combined with a temperature measuring block made of high thermal conductivity material and an optimized flow channel structure, significantly reducing the thermal inertia and thermal resistance of the temperature measuring system and improving the transient thermal response speed. It is particularly suitable for temperature measurement in cryogenic transient conditions such as superconducting cryogenic systems and modular hydrogen liquefaction equipment in the 20–30 K temperature range.

The invention discloses a fiber bragg grating ice force sensor integrated with a simply supported beam structure and a force measuring method thereof. The fiber bragg grating ice force sensor comprises a beam body, a fixed support and an optical fiber, the two ends of the beam body are installed on the fixed supports to form a simply supported beam structure. One surface, directly bearing an ice force load, of the part, located between the fixed supports, of the beam body is a stress surface, and the other surface opposite to the stress surface is an optical fiber mounting surface; and the optical fiber is mounted on the optical fiber mounting surface of the beam body. When the stressed plate is subjected to ice force, displacement and strain are generated, the beam body is driven to be bent and deformed in a simply supported beam mode, the optical fiber connecting piece fixed to the beam body generates tiny displacement accordingly, the fiber bragg grating in the optical fiber connected with the optical fiber connecting piece generates axial strain, and therefore the Bragg wavelength of the fiber bragg grating drifts; and the size and direction of the ice force can be obtained through inversion by monitoring wavelength change. According to the invention, the metal beam body and the fiber grating sensing element are highly integrated, the structure is compact, the weight is light, and installation and arrangement on a laboratory ice force experiment model are facilitated.

The embodiment of the invention provides an NV color center partial discharge quantum measurement device packaging method, and the method comprises the steps: designing a multi-core optical fiber, enabling the end face of the multi-core optical fiber to be disposed in a housing structure, and enabling the multi-core optical fiber to comprise a central core and a plurality of peripheral cores; manufacturing a support frame for supporting and fixing the diamond sample and the multi-core optical fiber; the supporting frame is arranged on one side of the end face of the multi-core optical fiber and is in tight butt joint with the end face of the multi-core optical fiber, and the multi-core optical fiber is fixed; the diamond sample containing the NV color center is fixed in the supporting frame; butting the diamond sample with the end surface of the multi-core optical fiber, and optically aligning the multi-core optical fiber with the diamond sample; filling the butt joint area of the end face of the multi-core optical fiber and the diamond sample with epoxy resin to form a packaging layer; and curing the epoxy resin to obtain the packaged optical fiber probe. According to the technical scheme provided by the invention, high sensitivity, high stability and miniaturized packaging of the NV color center sensor are realized.