30results about How to "High displacement sensitivity" patented technology

Numerical control equipment comprises a spindle device, a slide seat, a slide seat driving device, a workpiece clamping device and a main processing head, wherein Z-direction guide rod is mounted together with the slide seat only in a up-and-down moving manner; a rotating shaft is arranged in the Z-direction guide rod and can only rotate relative to the Z-direction guide rod; a Z-direction screw rod nut is fixed with the Z-direction guide rod; a conducting ring is arranged on the circumference of the rotating shaft; an electric wire accommodating hole or electric wire accommodating groove communicated with the conducting ring is formed in the rotating shaft; an electric wire is accommodated in the electric wire accommodating hole or electric wire accommodating groove; a swinging seat is formed integrally or fixed at the lower end of the rotating shaft; one end of the electric wire is electrically connected with the conducting ring; the other end of the electric wire is electrically connected with a main processing head driving motor and a swing shaft driving device which are mounted on the rotating shaft; the conducting ring is in triboelectric connection with an electric brush electrically connected an external power supply; and the electric brush is fixed with the Z-direction guide rod. The numerical control equipment has the advantages that the rotating shaft can rotate continuously by 360 degrees, and the electric wire connected with a main shaft motor and a rotating shaft driving device is prevented from being twisted off.

The invention discloses a folding-fabry-perot-cavity-based absolute distance measurement method and a device, and belongs to the field of laser interference precise measurement. The method comprises the following steps of: dividing incident intrinsic light into two beams of orthogonal polarized light; performing up frequency shifting and down frequency shifting on the two beams of orthogonal polarized light respectively by an acousto-optic variable frequency shifter respectively to form orthogonal polarized light beams with frequency difference; making the orthogonal polarized light beams enter a folding fabry-perot cavity; and performing resonance on the orthogonal polarized light beams with the frequency difference and an adjacent resonance order of the folding fabry-perot cavity respectively, wherein the frequency difference of the adjacent resonance order is a free spectrum range corresponding to the cavity length of the folding fabry-perot cavity and thus, measuring the absolute distance of the cavity length of the fabry-perot cavity according to the free spectrum range. The device for implementing the method can realize nanometer level measurement precision and magnitude measurement range of dozens of millimeters, and is suitable for nonlinear error calibration of nanometer and sub nanometer precision in the magnitude measurement range of dozens of millimeters and a nanometer displacement measurement system with high precision and a wide range.

The invention provides a circuit breaker auxiliary switch, which belongs to the technical field of low-voltage electrical appliance accessories. The auxiliary switch comprises a pair of mutually matched shells, a microswitch arranged in a shell cavity of the shells and a transmission part which is also arranged in the shell cavity of the shells. A first contact arm which is used for actuating a contact pin of the microswitch and a second contact arm which protrudes out of the shells and is used for actuating an operating mechanism of the circuit breaker are formed on the transmission part. The auxiliary switch is characterized in that a first working surface and a second working surface which are used for continuously touching the contact pin of the microswitch are formed on the first contact arm, wherein the first working surface is formed on the upper end face of the first contact arm, and the second working surface is formed on the top end face of the first contact arm. The auxiliary switch has the advantages that the auxiliary switch is favorable for protecting the life span of the microswitch, and can improve the action reliability and safety of the microswitch, so that the reliability of the auxiliary switch can be guaranteed; and the switch is concise in structure and easy to assemble.

In the present invention, a lens driving device has appropriate offset for miniaturization, excellent linearity of driving current versus displacement, and good displacement sensitivity. A casing holding a yoke with at least one permanent magnet mounted on an inner circumference thereof is connected with a lens holder having a driving coil installed on an outer sidewall thereof between an upper spring member and a lower spring member. When the driving coil is not powered, the lens holder props against the casing at a side opposite to an imaged object. When the lens holder props against the casing, the position of the driving coil along Z axis causing a magnitude of driving magnetic field intersecting with the driving coil is 50%˜90% of a maximum value of the driving magnetic field intersecting with the driving coil while the lens holder moves toward the imaged object.

The invention discloses a precision instrument guide rail system based on circular rolling element array arrangement and cambered surface clamping and positioning and belongs to the technical field ofprecision instruments and machines. A guide rail component is provided with four working faces, the middle area of each working face is of a groove structure, and each working face is symmetrically provided with two coplanar boss working belts of equal height. A guide rail rack component is composed of four supporting guide plates, and each supporting guide plate is provided with a rolling element set which comprises three rolling unit arrays distributed in a triangle mode. Each rolling unit array is formed by densely distributing a plurality of rolling elements. A sensor clamping and lockingcomponent comprises a clamping matrix, a clamping moving body and a clamping feeding mechanism; the clamping matrix is provided with a long-strip-shaped arc hole, a threaded hole and an arc groove; and the clamping moving body moves in the long-strip-shaped arc hole under the action of the clamping feeding mechanism so that a sensor can be locked or released. The precision instrument guide rail system integrates the characteristics of high precision, high rigidity and the clamping and locking features.

A five-degree-of-freedom adjustment and positioning method and apparatus for assembly / measurement of rotor and stator of an aircraft engine; said method comprises adjusting a plane motion and a rotation of a tested piece through composite motion comprising five degrees of freedom: a 360° rotatory motion around a Z axis, a plane motion along an X axis and a plane motion along a Y axis, a rotatory motion around the X axis and a rotatory motion around the Y axis; said apparatus comprises: a clamping mechanism, a turning platform component, a translational platform component and a rotational platform component. The present invention designs a five-degree-of-freedom adjustment and positioning method and apparatus having properties of large load bearing, high precision and high stiffness, thus improving assembly efficiency and measurement accuracy of the aircraft engine.

The invention discloses a method and system for testing the linear expansion coefficient of wooden cultural relics with a static thermomechanical analyzer, belonging to the field of analysis and testing techniques. The method comprises: cutting out a wooden cultural relic sample from the wooden cultural relic and drying it, processing and smoothing the surface of the dried wooden cultural relic sample; placing the wooden cultural relic sample on a static thermomechanical analyzer and fixing it, measuring and recording The initial sample length on the test direction; set the heating program of the static thermomechanical analyzer and start the experiment, record the curve of the deformation of the wooden cultural relic sample with temperature; process the test in the static thermomechanical analyzer data analysis software to obtain The curve of deformation changing with temperature is used to calculate the average coefficient of linear expansion of the wooden cultural relic in this temperature range. This method is used to test the coefficient of linear expansion of wooden cultural relics, and is suitable for evaluating the dimensional stability of slightly, moderately and severely degraded wooden cultural relics under temperature changes.

The invention discloses a SiC-based micro-optics high-temperature accelerometer and a design method, and belongs to the MOEMS technology field. A malposed double-FP cavity structure is formed through cavity length difference design, a mode of linear region overlapping of two paths of return signals in alternative change is achieved, and the measuring range of the accelerometer is widened. Through a mode of plating of a high-temperature anti-reflection film on a surface of a mass block, noise interference is reduced, and therefore the measuring precision is raised. The micromachining manufacturing technology of the sensing structure of the SiC-based micro-optics high-temperature accelerometer is provided, and the high temperature resistant characteristic of the sensing head of the accelerometer is achieved supplemented by a combined structure of an optical fiber with high temperature resistance and a hollow aligning sleeve and high temperature resistance packaging design. Through design of the SiC-based circle-round cantilever beam-mass block sensing structure, excellent mechanical response characteristics and displacement sensitivity of the sensing head are achieved. Severe environment working capabilities such as high temperature resistance or the like of the accelerometer are raised, and performances at aspects of measurement precision, dynamic measurement scope and miniaturization and the like are excellent.

The invention discloses a method for enhancing the sensitivity of interference phase shift based on Moiré fringes, which includes: the interference fringe light field formed by a spatial modulation interferometer passes through a polarizer and then enters an ordinary beam splitting prism, wherein the reflected light passes through a first plane reflector After reflection, it returns along the original optical path, and after passing through the ordinary beam splitter again, it passes through the polarization beam splitter and enters the array detector to form a set of interference fringe distribution; the transmitted light is reflected twice and then enters the polarization beam splitter. When it is incident on the array detector, another set of interference fringe distribution with opposite fringe orientation is formed. Adjust the third plane reflector so that there is an angle between the two groups of interference fringes on the array detector to form Moiré fringes. When the interference fringes are phase shifted, the moiré fringes will be shifted obviously. The moiré fringe-based interference phase shift sensitivity enhancement method of the invention has universality and can effectively improve the measurement sensitivity of a space modulation interference instrument.

A piezoelectric device comprises a pressure chamber forming layer, a vibration plate disposed on and connected with the pressure chamber forming layer to form a pressure chamber, and a piezoelectric element disposed on the vibration plate and used for driving the vibration plate to move and thus changing a volume of the pressure chamber, wherein the piezoelectric element is disposed on the vibration plate in such a manner as to cover a portion of the pressure chamber, the piezoelectric element has two opposite ends respectively extending beyond an edge of the pressure chamber and covering the pressure chamber forming layer. The piezoelectric device of the present invention can efficiently actuate the vibration plate, eliminate undesired displacements of the vibration plate in the opposite direction at the edge of the chamber, and provide higher displacement sensitivity to driving voltage.

The present invention relates to a gas phase / solid phase composite gyration benchmarking method and a device, which belong to the technical field of precision gyration benchmarking. The method compositely uses the gas lubricating and error averaging technology and the solid supporting and damping technology, the method applies axial solid support in the axial anti-thrust gaseous film of a gas-floated shafting to form a composite supporting mode with the primary solid support and the subsidiary gas support or the primary gas support and the subsidiary solid support or the gas support and the solid support which are the equivalent in order to notably enhance the axial rigidity and bearing capacity of the gas-floated shafting. Applying radial solid support in the radial gaseous film of the gas-floated shafting, the method utilizes the slight elastic deformation of elastic elements to dissipate the medium / high-frequency micro-vibration energy of a mainshaft and the stored deformation energy and static friction characteristic of the elastic elements to enhance positioning damp in order to increase positioning precision. In the device, the solid elastic elements are respectively assembled in the axial anti-thrust gaseous film and the radial gaseous film. The method can establish a gyration benchmark which also takes high precision, high rigidity, high support, low vibration and highdisplacement sensitivity into consideration.

The single (double) wing type gas / liquid two-phase composite rotary reference method and device belong to the field of precision rotary reference technology; the method uses gas lubrication rotary technology and liquid damping technology in combination, and takes advantage of the significant error averaging effect of gas lubrication technology to ensure The rotation accuracy of the rotary reference; at the same time, the viscous liquid has a significant damping or energy absorption effect on the vibration component of the rotary body to suppress the generation of medium and high-frequency micro-vibrations of the rotary body, and improve the motion stability, repeatability and positioning of the rotary reference Reliability; the device is equipped with a liquid damping system with an appropriate viscosity coefficient at the upper end, or lower end, or upper and lower ends of the air-floating main shaft; Composite rotary reference for precision and positioning reliability.