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278results about How to "High precision measurement" patented technology

High-accuracy remote absolute displacement measurement system based on optical fiber composite interference

The invention discloses a high-accuracy remote absolute displacement measurement system based on optical fiber composite interference, which belongs to the technical field of optical measurement and is composed of a board band light source, an optical fiber isolator, three 3dB couplers, four auto-collimation mirrors, two optical fiber gratings, four reflectors, two detectors, a circulator, a one-dimensional translation platform, piezoelectric ceramics, a feedback control circuit, a signal generator, a signal treatment circuit, an analog to digital (A/D) conversion card, a computer and result output. The high-accuracy remote absolute displacement measurement system uses an optical fiber interferometer to induce displacement and another optical fiber interferometer to demodulate displacement to achieve remote measurement. The optical fiber interferometer for demodulation works in a low coherence interference state and a high coherence interference state, and amplitude of displacement can be determined by low coherence signals to achieve absolute measurement. A value of the displacement can be measured by high coherence signals to feed back and control effects of environment interference on the demodulating optical fiber interferometer, and high-accuracy measurement can be obtained.
Owner:BEIJING JIAOTONG UNIV

Defective recording element correction parameter selection chart, defective recording element correction parameter determination method and apparatus, and image forming apparatus

A defective recording element correction parameter selection chart which is output by an image forming apparatus that performs image formation on a recording medium by a plurality of recording elements included in a recording head while conveying at least one of the recording head and the recording medium so as to cause relative movement between the recording head and the recording medium, the chart being used, in a case where there is at least one defective recording element which is not able to perform recording among the plurality of recording elements, in order to determine a defective recording element correction parameter expressing an amount of correction for correcting image formation defects caused by the at least one defective recording element, with image formation by a recording element other than the at least one defective recording element, the chart includes: a reference patch constituted by a uniform image which is an image formed on a region of the recording medium with a uniform density based on a constant tone; and at least one measurement patch in which a state after correction using the amount of correction corresponding to a candidate value of the defective recording element correction parameter which expresses the amount of correction is reproduced in a state that one or more of the recording elements which have formed the reference patch are set to be in a non-recording state, the candidate value of the defective recording element correction parameter being applied to an image formation portion which is formed by a recording element that carries out recording in a vicinity of a non-recording position of the one or more of the recording elements which have formed the reference patch and have been set to be in the non-recording state.
Owner:FUJIFILM CORP

Method for measuring simulated seabed terrain based on active stereo vision technology and measuring equipment

The invention discloses a method for measuring simulated seabed terrain based on an active stereo vision technology and measuring equipment. By the stereo vision technology, a binocular camera is arranged on the outside of an experimental trough, and seabed terrain changes are measured contactlessly through glass sidewalls of the experimental trough. Partial flow field will not be disturbed, and synchronous acquisition of the whole simulated seabed terrain can be realized. According to the invention, the active vision technology is used in underwater measurement. That is to say, by the utilization of auxiliary structured light irradiating underwater terrain through the glass sidewalls of the experimental trough, dense structured textures or dot arrays are formed on the terrain such that the camera can distinguish more easily. Meanwhile, quantity of terrain characteristic points is also increased. With the combination of the high-resolution camera, high-precision terrain data can be obtained. By the adoption of the method provided by the invention, noncontact, synchronous and high-precision measurement of the simulated seabed terrain can be realized, and corresponding problems existing in the prior art are solved.
Owner:INST OF MECHANICS - CHINESE ACAD OF SCI

Laser adjustable multipurpose measuring device and measuring method thereof

ActiveCN102305604AEasy to measure onlineEfficient online measurementUsing optical meansLaser transmitterMeasurement device
The invention discloses a laser adjustable multipurpose measuring device and a measuring method thereof. The measuring device comprises an adjustable laser transmitter mounted on a machine tool, transition sleeves arranged in two ends of a measured hole, a forward laser receiver and a reverse laser receiver which are respectively arranged in the transition sleeves. The method comprises the following steps: firstly, levelling the base plane of the measured hole and the machine tool; fixing the adjustable laser transmitter on a main shaft of the machine tool; regulating the laser beam of the laser and the stretching direction of the main shaft of the machine tool on the same straight line; moving the main shaft of the machine tool to the approximate central position of the measured hole; inserting the forward laser receiver and the reverse laser receiver into the transition sleeves; and then inserting the transition sleeves to two sides of the measured hole, and respectively reading thenumerical value of the forward laser receiver and the reverse laser receiver, thus the verticality or concentricity of the measured hole relatively to the base plane is obtained. According to the invention, the verticality of a deep hole and the base plane and the concentricity of the stretching direction of the main shaft of the machine tool and the hole axis line can be convenient and efficientto measure on line and the product quality can be ensured.
Owner:SHANGHAI ELECTRIC NUCLEAR POWER EQUIP CO LTD

Continuous wave frequency adjustment coherent optical fiber laser radar

InactiveCN101034161AAvoid the problem of mutual restriction of distance velocity resolutionFM high speedElectromagnetic wave reradiationOptical fiber amplifiersRadar
This invention belongs to a laser radar domain, which relates to a continuous wave frequency modulation cohere laser radar which is on the basis of optical fiber laser device. Optical fiber laser device is used as light source, of which launching wnd links optical fiber coupler. Optical fiber coupler divides energy of light into two parts. Moiety is used as characteristics light, which can be directly inputted in an input end of secondary optical fiber coupler, the other part is inputted in expanding bunch lens device; after expanding bunch lens compresses laser emission angle, direct surveyed area by 2-dimensional scanner; echo-signal is feed-through one end of transmission optical fiber through optical antenna by 2-dimensional scanner, the other end of transmission optical fiber contacts secondary optical fiber coupler by optical fiber amplifier. After echo-signal and characteristics light are combined and interfered to mix frequency by optical fiber coupler, enter monitor component element. Monitor component element can transform and magnify signal photoelectricity, output, post it in computer by collecting card, carry out data processing. This invention has features of small volume, light quality, high integrated degree, good stability, intelligentification and modular.
Owner:BEIHANG UNIV
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