135 results about "Tuning fork" patented technology

The invention discloses a compensation method for a vibration capacitance type electrostatic sensor, and the method comprises the steps: detecting the temperature of an environment where the current electrostatic sensor is located, enabling a sensitive piece signal to serve as an input value after amplification and filtering, obtaining a sensor output value through a linear temperature compensation function, and achieving the low calculation amount and convenient integration; a temperature compensation method comprises the following steps: detecting the temperature of an environment where a current electrostatic sensor is located, loading a sinusoidal signal of a reference resonant frequency corresponding to the temperature to a first piezo-electric crystal, and detecting a feedback signal peak value of a second piezo-electric crystal, so that a tuning fork always vibrates at a natural vibration frequency, and the adaptability of the electrostatic sensor to the environment temperature is improved; according to the induction distance compensation method, the vertical distance between a current electrostatic sensor and the surface of a detected object is detected, a sensitive piece signal is amplified and filtered to serve as an input value, a sensor output value is obtained through a linear induction distance compensation function, the calculated amount is low, and integration is convenient.

The invention belongs to the technical field of laser processing, and provides a quartz crystal etching solution which comprises the following components in volume concentration: 10-30% of hydrofluoric acid, 1-5% of sulfuric acid, 0.1-0.3% of surfactant and the balance of water. By optimizing the proportion, the manufacturing precision and the production and manufacturing efficiency of the tuning fork wafer are improved. And the stable etching rate and the optimal etching surface are obtained, and meanwhile, the cost is saved for process replacement. The invention further provides a method for cutting the tuning fork of the quartz crystal through the laser. The method comprises the steps that S1, the cutting contour line of the tuning fork is preset on the quartz crystal; s2, performing laser cutting on the quartz crystal based on a preset cutting contour line, and forming a tuning fork contour on the quartz crystal; and S3, integrally soaking the quartz crystal in the quartz crystal etching solution, and separating out the tuning fork. The machining process of the quartz crystal tuning fork is simplified, the cutting quality is optimized, the method is suitable for the large-piece manufacturing process, and the cutting efficiency and the yield are greatly improved.

The invention discloses a low-coupling biaxial silicon micro-resonant accelerometer. The low-coupling biaxial silicon micro-resonant accelerometer comprises an upper-layer micro-accelerometer structure and a lower-layer glass substrate with a signal lead, the micro-accelerometer structure is composed of two separated mass blocks, two pairs of identical tuning fork resonators and eight identical primary amplification levers. The two separated mass blocks are fixed on the same group of anchor points through U-shaped beams in different directions and are respectively used for measuring the acceleration of X / Y axes, and the whole structure is in a symmetrical figure. The four tuning fork resonators are distributed in a central symmetry mode and used for detecting the acceleration of the X axis and the acceleration of the Y axis. The X-axis and the Y-axis adopt the separated mass blocks, the sensitive mass blocks of the X-axis and the Y-axis are not connected, complete decoupling of the two detection axes is achieved, the lever structure can effectively amplify inertia force generated by the mass blocks, the sensitivity of the accelerometer is improved, and high-precision double-axis acceleration measurement is easy to achieve.

The invention discloses a resonance type flow field MEMS sensor based on PT symmetry and a preparation method thereof, and the method comprises the steps: two double-end fixed tuning fork resonators are coupled, are in mirror symmetry in structure, and are equal in mass; the two double-end fixed tuning fork resonators are positioned on the same straight line; the comb tooth capacitors are symmetrically distributed on two sides of each double-end fixed tuning fork resonator; the two adjustable damping circuits are connected with the electrode layer through leads, so that the two adjustable damping circuits are correspondingly connected with the two double-end fixed tuning fork resonators; the equivalent damping of the two adjustable damping circuits is opposite in sign and equal in size; the cilium supporting structure is suspended at one end of a double-end fixed tuning fork resonator; the micro lever is connected with the cilium supporting structure and the double-end fixed tuning fork resonator; the cilia is arranged on the cilia supporting structure; glass serves as a substrate of the sensor. According to the invention, the resonance type flow field MEMS sensor can obtain perturbation response performance with higher sensitivity, and sensitive measurement of weak flow velocity is realized.

An infrared detector includes a tuning fork resonator comprising an mechanical-to-electrical transduction mechanism; a metamaterial absorber residing on at least one side of the tuning fork resonator, the metamaterial absorber comprising at least a material layer with subwavelength inclusions; and a signal processing circuit to translate the electrical signal into an amplitude of mechanical motion of the tuning fork.

To accurately detect the remaining amount of toner regardless of the remaining amount within a toner vessel and deviation of toner in an image-forming device.SOLUTION: An image-forming device 100 includes a toner remaining amount detection device 200 for detecting a toner remaining amount W within a toner cartridge 32A as one example of a toner vessel 32 for housing toner. The toner remaining amount detection device 200 includes: a tuning fork 210 installed so as to receive a load from the toner cartridge 32A; a vibration detection section 220 for detecting vibration of the tuning fork 210 because of a load; and a control section 230 for estimating the toner remaining amount W. The control section 230 acquires a first oscillation frequency f1 resonating with the toner cartridge 32A before starting a print job, and a second oscillation frequency f2 resonating with the toner cartridge 32A after completion of a print job, and estimates the toner remaining amount W by using a difference between the first oscillation frequency f1 and the second oscillation frequency f2.SELECTED DRAWING: Figure 3

The invention provides a coupling stiffness disturbance type MEMS modal localization accelerometer, which is characterized in that a core sensing unit adopts a double-tuning-fork resonator parallel arrangement configuration, and an offset weak coupling resonance system is designed and constructed through the difference of equivalent support stiffness parameters. The outer tuning fork resonator is directly connected with the sensitive mass block, the inner tuning fork resonator realizes full-constraint fixation through a base anchor point, and the outer tuning fork resonator and the inner tuning fork resonator form a double-tuning-fork electrostatic weak coupling resonant structure through an electrostatic coupling parallel plate, so that energy transfer between resonant units is realized. The mechanism of the accelerometer is different from that of a traditional rigidity or quality disturbance mode localization sensor, when the accelerometer is subjected to the action of external acceleration, the inertial micro displacement of the accelerometer is converted into coupling rigidity change of the weak coupling resonance system, the resonance unit amplitude ratio of the weak coupling resonance system is detected through an external circuit, and the detection accuracy is improved. Therefore, the detection of coupling rigidity disturbance is realized, and finally the high-sensitivity detection of the measured acceleration is realized.

The invention relates to a manufacturing process of a tuning fork type piezoelectric vibrating reed, and belongs to the technical field of piezoelectric vibrating elements, and the manufacturing process comprises the following steps: S1, arranging a to-be-masked area on the piezoelectric vibrating reed, arranging mechanical masks on a first main surface and a second main surface of the piezoelectric vibrating reed, and enabling the mechanical masks to be located at two sides of the to-be-masked area, forming a piezoelectric vibration sheet covering the mechanical mask plate; s2, performing surface deposition treatment on the piezoelectric vibrating reed which is prepared in the S1 and covered with the mechanical mask plate so as to form an etching protective film on the surface of the piezoelectric vibrating reed and form a deposited piezoelectric vibrating reed; and S3, taking down the mechanical mask plate covering the deposited piezoelectric vibrating reed prepared in the step S2, and forming a mask pattern corresponding to the piezoelectric vibrating reed in shape on the etching protection film by utilizing a photoetching technology. The method has the effect of reducing the adverse effect on the product yield.

A tuning fork quartz crystal oscillator and a resonator are provided. The tuning fork quartz crystal oscillator includes a quartz crystal oscillator body, where an energy transfer path of the quartz crystal oscillator body is provided with outwardly protruding energy splitters. In the tuning fork quartz crystal oscillator, the outwardly protruding energy splitters are added to a fixed portion of the tuning fork, and the quartz crystal oscillator is packaged and fixed to a ceramic base. This design effectively limits the energy of prongs to the outwardly protruding energy splitters instead of a dispensing position of the fixed portion, avoiding energy transfer to the ceramic base and thus avoiding excessive overall impedance of the device due to vibration leakage.

This invention provides a tuning fork-type piezoelectric vibrator device that prevents mounting misalignment of the tuning fork-type piezoelectric vibrator, enabling more stable manufacturing. [Solution] The first mounting pad 6a and the second mounting pad 6b, provided on the upper surface of the stepped portion 32 of the package 3, are formed in an upward-convex shape having a curved surface such that their thickness decreases (gradually decreases) as they approach each other in the second direction (X direction), and the joining members 7a and 7b of the tuning fork type piezoelectric vibrator 2 are connected to the curved portions of the upward-convex mounting pads 6a and 6b, forming a tuning fork type piezoelectric oscillator 1.

The present application relates to a kind of downhole hold rate measurement method, downhole fluid interface and geometric distribution determination method, belong to oil and gas exploration technical field.The downhole hold rate measurement method utilizes multiple tuning forks distributed on flow cross section, realizes oil-water determination by comparing the size of fluid density collected by tuning fork with the size of preset oil-water density distinguishing threshold, realizes the representation of downhole fluid hold rate using the time proportion of oil / water collected by tuning fork, with the advantages of good universality, high measurement efficiency and high resolution.The downhole fluid interface determination method utilizes multiple tuning forks distributed on flow cross section to realize oil-water determination, identifies oil-water interface point according to oil-water alternative switching phenomenon, and determines horizontal well oil-water interface.The downhole fluid geometric distribution determination method utilizes multiple tuning forks distributed on flow cross section to realize oil-water determination, combines local oil hold rate calculation and tuning fork position distribution, and draws fluid geometric distribution diagram.

This application relates to a layer-by-layer vacuum evaporation device for a crystal tuning fork and its preparation process. The device comprises a frame and a vacuum evaporation chamber mounted on the frame. A evaporation turntable is rotatably mounted in the vacuum evaporation chamber. A plurality of evaporation mounting racks are equidistantly spaced along the circumference of the evaporation turntable. The evaporation mounting racks are rotatably mounted on the evaporation turntable. At least one mask plate is mounted on the evaporation mounting rack, and the mask plate is used to accommodate the tuning fork. The vacuum evaporation chamber has multiple molybdenum evaporation boats located at the center of the evaporation turntable. The molybdenum evaporation boats are used to place and evaporate metal evaporation materials. The vacuum evaporation chamber is provided with a flip assembly. When the evaporation mounting racks pass through the flip assembly, they rotate so that the mask plates pass obliquely over the molybdenum evaporation boats. This application improves production efficiency.

The invention provides a tuning fork level switch circuit with an adjustable alarm frequency function and an implementation method. The tuning fork level switch circuit comprises a power supply circuit, a tuning fork sensor, a frequency measurement circuit, a single chip microcomputer control circuit, an alarm frequency setting circuit, a relay output circuit, an LED alarm lamp circuit and a data storage circuit. The tuning fork sensor generates resonance after being electrified, and the frequency measuring circuit collects the vibration frequency of the tuning fork sensor and transmits the vibration frequency to the single-chip microcomputer through signal amplification and filtering. A pulse counter is arranged in the single-chip microcomputer to calculate the vibration frequency, and the vibration frequency is compared with the preset alarm frequency. When the detected vibration frequency belongs to the alarm frequency range, the single-chip microcomputer controls the relay to output the switching value and controls the LED alarm lamp to display the alarm state. The data storage circuit is used for storing key parameters and alarm information. The method can be widely applied to measurement of industrial and civil liquid media and medium-density solid powder, and has remarkable engineering value and application prospect.

The objective is to provide a tuning fork-type oscillator that can reduce the equivalent series resistance. [Solution] The tuning fork vibrator 10 has a base 1 and two tuning fork arms 2 and 3 extending from the base 1, with grooves 21, 22, 31, and 32 formed on the first surface and the second surface opposite the first surface of the tuning fork arms 2 and 3, respectively. The widthwise centers of the grooves 21 and 31 formed on the first surface of the tuning fork arms 2 and 3 are offset in a first direction toward the space between the two tuning fork arms 2 and 3 from the widthwise center of the tuning fork arms 2 and 3, and the widthwise centers of the grooves 22 and 32 formed on the second surface of the tuning fork arms 2 and 3 are offset in a second direction opposite to the first direction from the widthwise center of the tuning fork arms 2 and 3.

The utility model discloses an EDC toy capable of directly pushing and rotating a tuning fork, which relates to the technical field of EDC toys and comprises a middle plate, an upper plate and a lower plate are arranged on the upper side and the lower side of the middle plate respectively, an inner mounting protrusion is arranged on the inner wall of the upper plate, a mounting part is detachably mounted on the inner mounting protrusion, a first clamping groove is formed in the mounting part, and a second clamping groove is formed in the first clamping groove. A first clamping groove is formed in the middle plate, a rotating piece is clamped in the first clamping groove in a sliding mode, a retention groove is formed in the middle plate, the rotating piece is rotationally arranged in the retention groove, a tuning fork groove is formed in the middle plate, and a sound outlet groove is formed in the inner side wall of the tuning fork groove. Vibration hand feeling feedback can be generated in the pushing process of the upper-layer plate and the middle-layer plate, and the middle-layer plate can make biting sounds through the tuning fork grooves. The decompression effect of the toy can be improved according to three scientific decompression principles of distracting attention by triggering, tactile stimulation and ASMR (spontaneous consciousness meridian reaction).

The invention discloses a dynamic modeling and performance analysis method for a quartz double-end tuning fork resonator, and the method comprises the steps: constructing a high-order displacement field which meets the condition that the free boundary stress is zero in prior to describe the deformation of a mass block, and employing a coupling scheme based on a virtual work principle; the tuning fork arms and the mass block are integrated into an energy conservation dynamic self-consistent system. According to the method, the linear characteristic frequency and modal of the system are solved, then geometric nonlinearity is introduced, and the amplitude-dependent nonlinear frequency response is accurately calculated through an iterative algorithm. According to the dynamic modeling and performance analysis method for the quartz double-end tuning fork resonator, the fundamental frequency prediction error is reduced to 0.34% from 1.6% of a traditional model, and the relative precision is improved by 79%; meanwhile, the non-physical residual stress at the free boundary is restrained to the magnitude of the maximum stress in the domain, the boundary stress distortion is fundamentally eliminated, and a reliable theoretical tool is provided for accurate design and optimization of the high-performance MEMS resonator.

The invention relates to a light-induced thermoelastic spectrum tuning fork with a double-helix structure and a preparation method thereof, a pair of vibration arms of the tuning fork are wound to form the double-helix structure, the tuning fork is installed on a base, the radius of a spiral curve of each vibration arm is gradually reduced from the vibration end of the tuning fork to the installation end of the base according to the Fibonacci sequence R = 0.168 n mm, n represents the number of turns of the spiral curve of the vibrating arm relative to the vibrating end of the tuning fork. Compared with the prior art, the tuning fork quality factor is remarkably improved, and the detection sensitivity and the system stability are enhanced.

The application discloses a resonant silicon micro accelerometer and relates to the technical field of micro electro mechanical systems, which comprises a lower substrate silicon and an upper mechanical structure, the substrate silicon is provided with a left anchor point and a right anchor point, and the upper mechanical structure is anchored on the left anchor point and the right anchor point; the mechanical structure comprises two left tuning fork beam resonators and right tuning fork beam resonators which are symmetrical along an X axis, the left tuning fork beam resonator is fixed on the substrate silicon through the left anchor point, and the right tuning fork beam resonator is fixed on the substrate silicon through the right anchor point; the left anchor point and the right anchor point are located between the left tuning fork beam resonator and the right tuning fork beam resonator and are symmetrically arranged along the X axis, and the left anchor point, the right anchor point, the left tuning fork beam resonator and the right tuning fork beam resonator are on the same straight line; the X axis is a sensitive axis direction. According to the scheme, the number of fixed anchor points is reduced to two, and the fixed anchor points are arranged as close to the center as possible, so that the influence of temperature stress on the sensitive structure is further reduced.

A tip-enhanced spectroscopy may include a substrate on which liquid containing an analyte is to be positioned, a tip extending from a fixed end to a free end adjacent to a location for the analyte, and a vibration source configured to harmonically vibrate the tip based on a preset natural frequency. The preset natural frequency may be a natural frequency of a tuning fork.

The utility model relates to the field of test equipment, in particular to a resonance test device, which comprises two tuning fork units, a knocking unit and an identification unit, each tuning fork unit comprises a base, and a test tuning fork is arranged on the base; the test tuning fork is detachably connected to the base; an identification unit is arranged on the base of one tuning fork unit; the identification unit comprises a support frame arranged on the base, and the support frame is connected with a detection ball through a connecting rope; the detection ball is attached to the adjacent test tuning fork; the knocking unit comprises a knocking hammer for knocking the test tuning fork; according to the utility model, through cooperation of the tuning fork unit, the knocking unit and the identification unit, demonstration of a resonance test can be realized; meanwhile, the test tuning fork and the base are designed to be in a detachable connection mode, so that the resonance test device is convenient to disassemble and assemble, and subsequent folding, unfolding, transferring and using of the resonance test device are facilitated.

The utility model relates to the technical field of tuning fork level switches, and discloses a probe structure of a tuning fork level switch, which comprises a telescopic tuning fork probe structure, the top of the telescopic tuning fork probe structure is fixedly connected with a connecting sleeve, the top of the connecting sleeve is fixedly connected with a flange plate, and the top of the flange plate is provided with a tuning fork level switch main body. The telescopic tuning fork probe structure comprises a telescopic sleeve fixedly connected to one side of the bottom of the connecting sleeve, a tuning fork is inserted into an inner cavity of the telescopic sleeve, a plurality of fixed insertion holes which are evenly distributed at equal intervals are formed in one side of the outer wall of the tuning fork, and sliding grooves are symmetrically formed in the two sides of the inner wall of the telescopic sleeve; when the device is used, the length of the probe can be flexibly adjusted according to needs, and the device is convenient to operate, high in flexibility and practicability, convenient to use and beneficial to improving the practicability of the device.

The present invention relates to the field of density measurement technology, and in particular to a fixed online density meter, comprising a flange, a circular mounting groove is provided on the top of the flange, a rotating ring is rotatably installed in the mounting groove, a cylindrical fixed pile is rotatably installed at the inner ring of the rotating ring, two symmetrically arranged tuning fork detection heads are arranged at the bottom of the rotating ring, two symmetrically arranged connecting piles are arranged at the top of the rotating ring, and a display instrument is arranged at the top of the two connecting piles and above the fixed piles. The invention designs a rotating ring, and two tuning fork detection heads can be used reciprocatingly and cyclically through the rotation of the rotating ring, thereby improving the efficiency of density detection.

A surface-mount light-emitting diode (LED) having a tuning-fork-shaped electrode pad. The surface-mount LED comprises a housing (1) having a light-emitting chamber (2), and a first electrode pad (3), a second electrode pad (4), a third electrode pad (5) and a fourth electrode pad (6), wherein the first electrode pad (3) is of a tuning-fork-shaped structure, the tuning-fork-shaped structure divides the lower surface of the light-emitting chamber into three sections, and the second electrode pad, the third electrode pad and the fourth electrode pad are respectively arranged in the three sections; and a red chip (7), a blue chip (8) and a green chip (9) are respectively provided on three end portions of the tuning-fork-shaped structure, the first electrode pad serves as a common electrode for the red chip, the blue chip and the green chip, and the second electrode pad, the third electrode pad and the fourth electrode pad are respectively electrically connected to the other electrode leads of the red chip, blue chip and green chip. Thus, the arrangement spacing between the three light-emitting chips is increased.

A tuning fork resonator having a design allowing reduced dimensions of resonators while maintaining a high quality factor.

The present invention discloses a substation steel frame support provided by an embodiment of the present invention, which is used to solve the problem in the prior art that large-span substation steel frames will generate temperature stress, increasing the possibility of fracture or deformation and causing safety accidents. It includes: The substation steel frame support is a left-right symmetric structure. Above the chevron column, a chevron column top plate is connected. Above the chevron column top plate, two circular tube columns are arranged. Above the circular tube columns, a circular tube column top plate is connected. A guide rail is arranged on the circular tube column top plate. The two circular tube columns are respectively connected to a beam joint plate. A guide groove is arranged below the end of the beam joint plate. The beam joint plate and the circular tube column top plate are slidably connected through the cooperation of the guide rail and the guide groove. The beneficial effects include: When there is thermal expansion and contraction due to temperature change, both the tuning fork column and the sliding connection can eliminate temperature stress; improve the safety and reliability of the frame, reduce the accident probability, and have great economic and social benefits.

A vibratory tuning fork level sensor probe arrangement (100) for a can, comprising: a first vibratory tuning fork level sensor (102); a second vibratory tuning fork level sensor (104); and a conduit (106) configured to hold the first vibratory tuning fork level sensor in a first position and to hold the second vibratory tuning fork level sensor in a second position at a predetermined distance from the first vibratory tuning fork level sensor, the first vibratory tuning fork level sensor and the second vibratory tuning fork level sensor are configured to determine a position of an interface of the material in the tank.

The utility model discloses a constant-pressure and constant-flow water supply system, which relates to the technical field of automatic water supply and comprises a water storage tank, a water feeder, a booster water pump, a contactor, a water pump operation indicating lamp, a frequency converter, a transmissible pressure gauge and a tuning fork liquid level device. The frequency converter is installed on the power input side of the pressurizing water pump. The signal output end of the teletransmission pressure gauge is connected with the frequency converter, and the pressure detection end of the teletransmission pressure gauge is communicated with the water feeder; the tuning fork liquid level device is installed on a pipeline between the pressurizing water pump and the water storage tank, a controller of the tuning fork liquid level device is connected to a coil of the contactor, and when a tuning fork of the tuning fork liquid level device leaves water, the tuning fork liquid level device is used for controlling a contact of the contactor to be disconnected. In the system, the pressurizing water pump cannot be started and stopped frequently and cannot run at a high speed all the time, the mechanical and electrical failure rate is reduced, the electrical service life is prolonged, and the energy consumption is reduced.

The invention discloses a multi-working-condition self-adaptive tuning fork switch circuit. Belongs to the technical field of level detection. The circuit comprises a micro-control unit, an analog-to-digital converter (ADC), an analog switch and a plurality of independent signal processing channels. A vibration signal of a tuning fork probe is collected through an ADC, the frequency and amplitude characteristics of the signal are analyzed in real time through an MCU, the frequency and amplitude characteristics are compared with a preset probe characteristic database, and the type of the accessed probe is automatically identified as a large fork, a vibration rod or a small fork; after identification, the MCU controls the analog switch to be switched to the corresponding special signal processing channel, thereby realizing adaptive matching of driving and detection parameters of different probes. According to the invention, the problems of special circuit board, high cost and poor flexibility in the traditional scheme are solved by using a set of universal hardware, the research and development and inventory costs are significantly reduced, and the detection precision and applicability under all working conditions are improved.