48results about How to "Realize displacement measurement" patented technology

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 homodyne one-dimensional grating displacement measuring device, comprising a single-frequency laser, a polarization beam splitting prism, a beam splitting prism, a plane mirror group, a quarter wave plate, two signal receiving units and a signal processing system, wherein the single-frequency laser It is used to emit a beam of linearly polarized light with a fixed frequency, which is incident to the polarizing beam splitter prism for beam splitting, and a beam is reflected to the plane mirror group, which is vertically incident to the diffraction grating through the 1 / 4 wave plate, and diffracted by the diffraction grating to generate diffracted light, which is passed through the plane mirror group, The 1 / 4 wave plate and the polarizing beam splitting prism are incident on the beam splitting prism; the other beam is symmetrical with it to generate diffracted light, and the two diffracted beams interfere to form the interference light after being split by the beam splitting prism and enter the two signal receiving units respectively. The invention can not only realize the straightness measurement of large stroke, but also realize the displacement measurement of four times subdivision of single diffraction, and can realize the displacement measurement of eight times subdivision by using right angle prism or corner prism.

The invention provides a shield tunneling machine cutterhead wear on-line measurement method, which utilizes a foam hole in an existing shield tunneling machine cutterhead, can realize on-line measurement through a hydraulic oil cylinder, a pressure sensor and a displacement sensor, reduces personnel pressurization construction, is simple in measurement device, is convenient for mastering the wearamount of a cutter at any time, and avoids delaying a construction period.

The invention discloses a displacement detection system based on an asymmetric interference structure and a detection method thereof. The system comprises a detection light source, an optical module,a displacement monitoring module and a photoelectric detection module, wherein the optical module comprises a first port, a second port and a third port; the first port is connected with the detectionlight source; the third port is connected with the photoelectric detection module; the displacement monitoring module is fixedly connected with a to-be-detected object; and the displacement monitoring module is of a stepped structure comprising a first reflecting surface and a second reflecting surface. Through the optical module capable of realizing the function of an optical fiber circulator and the displacement monitoring module with a stepped structure, the stepped structure reflecting surface reflects the light to return to the second port and superposes the light with the reflected light of the end surface to form an interference signal, the displacement information of the to-be-detected object is obtained by analyzing the interference signal, displacement measurement in the direction parallel to and perpendicular to the end face of the second port can be achieved, and therefore the application range of the displacement sensor based on the optical structure is widened.

The invention provides an online measuring device of cutterhead abrasion of a shield tunneling machine. The online measurement can be realized by using foam holes in a cutterhead of an existing tunneling machine through a hydraulic oil cylinder, a pressure sensor and a displacement sensor; the personnel pressurized construction is reduced; the measuring device is simple; the abrasion quantity of acutter can be conveniently mastered at any time; and the construction period delay is avoided.

The invention discloses a laser displacement measurement device and method, comprising: an interference measurement module, a laser light source module, a signal modulation module, a control processing module, and an optical cursor demodulation module; wherein, the control processing module controls the signal modulation module to apply the laser light source module The light source modulates the signal so that the laser light source module provides two laser beams with a fixed frequency difference to the interferometry module; the control processing module controls the interferometry module to perform interferometry, and the lasers are respectively carried out in two Fabry-Perot cavities in the interferometry module Interference is detected by two photodetectors respectively to form main and auxiliary measurement interference signals; the optical cursor demodulation module demodulates the main and auxiliary measurement interference signals obtained by the interferometric module, and the demodulation result is calculated by the control processing module to obtain the measured displacement. The invention has sub-picometer-level resolution and can be used for large-scale and high-precision measurement of displacement.

The invention discloses a horizontal two-way deformation monitoring system. A large sleeve and a small sleeve are connected together to form a set of sleeve sets; several sleeve sets are connected end to end in sequence; Tube chute; one end of the small sleeve is positioned and slidably connected with the large sleeve of the same group of sleeves through the large sleeve chute, and is provided with a distribution plate, and the distribution plate is provided with a number of distribution holes. The other end of the small casing is fixedly connected to the large casing of the next group of sleeves through the connecting ring; each of the line bodies corresponds to one of the line distribution discs, and the end of the line body is fixedly connected to the corresponding one of the line-distributing holes of the line-distributing plate; the rest of the wires pass through the other line-distributing holes of the line-distributing plate. The invention is beneficial in that it can monitor settlement or rebound deformation at different elevations inside the soil; with a large range, soil deformation can be reflected to the end through the line body, realizing displacement measurement; and meeting the demand for large-range monitoring.