63results about How to "Achieving Absolute Measurements" patented technology

The present invention belongs to the field of fine surface structure measuring technology, and relates to one kind of differential confocal scanning detection method with high spatial resolution. Differential confocal microscopic double receiving light path configuration and double detector subtraction form the differential confocal signal in measuring the workpiece. Optical super-resolution confocal microscopic detection method is adopted to raise the transverse resolution, and differential confocal microscopic detection method is adopted to raise the longitudinal resolution, so as to reach differential confocal scanning detection of high spatial resolution. The method can meet the requirements in high spatial resolution, high precision and great measurement range, and is especially suitable for the measurement of fine surface 3D structure, miniature steps, miniature grooves, line width, surface appearance, etc.

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.

The invention provides a measuring instrument with an optical fiber Mach-Zehnder interferometer and optical fiber Michdson interferometer arrays, which comprises a broad-band light source 1, a photoelectric detector 2, a 3dB optical fiber 2 multiplied by 2 coupler 3, the optical fiber Mach-Zehnder interferometer, a transposed 3dB optical fiber 2 multiplied by 2 coupler 7, optical fiber Michdson interferometers arrays 8 and 8', and a single-mode connecting optical fiber 9, wherein, the optical fiber Mach-Zehnder interferometer consists of an attenuator 4, a self-focusing lens 5, an axicon lens 6 with total reflection angle, and the connecting optical fiber 9. The measuring instrument with the optical fiber Mach-Zehnder interferometer and the optical fiber Michdson interferometer arrays utilizes a technique that measures strain and temperature at the same time, realizes the temperature compensation technique and the array arrangement of optical fiber sensors, realizes absolute measurement under the situation that the multiple sensors are not interfered by each other, lowers the cost of single-point measurement and ensures real-time measurement; furthermore, the measuring instrument has simple techniques and easy implementation, and as standard optical fiber communication elements are adopted as the optical fiber materials and devices, the measuring instrument has low cost, easy acquisition of the optical fiber materials and devices and easy popularization.

The invention discloses a method for measuring a high energy laser energy parameter based on a light pressure principle and an apparatus thereof. The method comprises the following steps: a reflector and a deformation rod are arranged on a high energy laser incidence optical path, a plurality of displacement sensors are provided at a back side of a reflector laser incidence direction, micrometricdisplacement of the reflector caused by light pressure in a laser light extraction process is measured in real time, a light pressure value generated by laser is solved, and parameters of the laser such as average power, energy, P-t curve, light spot center of mass change and the like are calculated. According to the method and the apparatus in the invention, light beam is not blocked in usage, an on-line measurement of undistributed transmission of high energy laser is realized, cost-effectiveness of an experiment is raised, simultaneously, a measurement system does not need to bear strong laser irradiation, and the method and the apparatus can be used for high power laser parameter measurement.

The invention belongs to the technical fields of optical microscopy imaging and optical precision measurement and relates to a laser differential confocal spectrum microscopy tomography device which mainly comprises a Raman spectrum analysis part (25) and an objective lens (6), a polarizing spectroscope (7), a one-quarter glass slide (8) and a measurement objective lens (9) which are sequentially arranged along the optical path; the laser differential confocal spectrum microscopy tomography device further comprises a differential confocal detection part (26) which is positioned in the reverse direction of the reflection direction of the polarizing beam splitter. The differential confocal detection part is used for measuring the geometric position of a micro-area of a sample and focusing the sample to obtain image information of the micro-area of the sample; the Raman spectrum analysis part is used for analyzing the material spectrum of the detected area of the sample to obtain component information of the micro-area of the sample; the combination of the two parts can realize the nano-level micro-area spectrum measurement of the sample and simultaneously obtain the geometric feature and the material component information of the micro-area of the sample. The laser differential confocal spectrum microscopy tomography device provides a powerful observation means for bio-medicine, material science, high-energy physics and other forefront subjects.

The invention discloses a non-contact static detection device, which comprises a static sensor, an electronic switch and an electric signal processing unit, wherein the static sensor comprises a sensing electrode and a coupling electrode; the sensing electrode is a metal static signal receiving surface; the coupling electrode is a metal electrode; the sensing electrode and the coupling electrode construct a capacitor of fixed capacitance; the sensing electrode is electrically connected with the electronic switch; and the electric signal processing unit is used for grounding or suspending the sensing electrode alternatively by controlling the electronic switch, and is also used for performing subsequent processing on an alternating signal acquired from the coupling electrode to convert the processed alternating signal into an electric field value. The non-contact static detection device has the characteristics of no mechanical part, high coupling capacitance variation quantity, high sensitivity, flexible sensor design and easiness in realizing; and by selecting the static sensor, static electricity or weak static electricity in tiny regions can be measured in real time and absolutely.

The invention relates to an ultraviolet three-frequency high spectrum resolution laser radar system based on three-channel FP etalon and a detection method thereof, wherein the system and the method can be used to simultaneously detect a 0-35km height wind field, a temperature and an aerosol in a high precision mode. The system is characterized in that an emission laser frequency is alternatively changed among v0, v0-2GHz and v0+2GHz; channels L, 1 and 2 of the etalon are designed into one body, a free spectral spacing is 8GHz, spectral widths are 0.2GHz, 1GHz and 1GHz, 1-L and 1-2 peak to peak intervals are 0.1GHz and 4GHz; the v0 is locked at a peak value of the channel 1; and a quarter wave plate and a polarizing beam splitter prism form a cascading light path. The system and the method have advantages that a single radar can simultaneously measure the 0-35km height wind field, the temperature and the aerosol in the high precision mode; and disadvantages that detection precision of a single parameter detection technology is not high, a detection range can not be covered and three parameters mutually influence each other so that an inversion error is large are overcome.

The present invention relates to a method for measuring surface resistance and its device, which is used for detecting metal material and superconducting material, in particular, it is a method and measuring device for detecting surface resistance of high-temperature superconducting film material. It adopts a medium-loaded resonator whose one end is short-circuited and another end is in opened state. It can respectively measure two microwave media loaded resonant cavities in which the decribed microwave media are respectively formed from two medium columns which are identical in material and length and different in diameter, so that it can define the system quality factor value Qr correspondent to other loss except tested sample, and further can meausre tested sample so as to obtain the surface resistance R of tested sample.

The invention discloses a laser interferometric wavelength lever-type absolute distance measurement method and device. The system comprises a light source system, a wavelength lever-type laser interference system and an interference signal processing and controlling system, wherein orthogonal-line polarized beams with the wavelengths of lambda 1 and lambda 2 are output by the light source system and emitted to the wavelength lever-type laser interference system to form interference beams which are emitted to the interference signal processing and controlling system; in the wavelength lever-type laser interference system, a wavelength lever-type absolute distance measurement relationship between measured absolute distance and motion displacement of a cube-corner prism of a reference arm is formed through corresponding relationship between synthetic wavelength and single wavelength; the interference signal processing and controlling system is used for detecting a phase difference of two single-wavelength interference signals, calculating the measured absolute distance and controlling change of the wavelength of lambda 2 in the light source system. Any absolute distance can be measured, transition from synthetic wavelength to single wavelength can be realized, and the method and the device are suitable for large-length or large-size and high-accuracy absolute distance measurement in the field of large precision assembly manufacture, spatial engineering, measurement technique and the like.

The invention relates to super-resolution dual-axis differential confocal measurement method and device for division focal spot detection, which belong to the technical field of optical precision measurement. By utilizing the characteristic that the transversal deflection of a detector makes the axial response curve of the dual-axis confocal microscopy generate displacement, adopting the transversal differential detection method of a division focal spot to receive and process a measuring optical beam in the dual-axis confocal microscopy, and combining a super-resolution pupil filtering technology, the method and the device achieve the purposes of enhancing the system resolution, extending the working distance, enhancing the anti-jamming capability and improving the linear range. The invention can be used for the precision measurement of microelectronics, materials, industry precision detection, biomedical field and the like.

The invention belongs to the technical field of spectrum measurement, and relates to a high spatial resolution biaxial differential confocal spectrum imaging method and an apparatus. According to the present invention, the biaxial differential confocal microscopy technology and the spectrum detection technology are fused, focal spot cutting differential detection is adopted so as to achieve precise imaging of the geometry position, simplify the optical path structure of the traditional differential confocal microscopy system, inherit the advantages of large visual field and large work distance of the biaxial microscopy technology, and achieve high spatial resolution spectrum integrated detection of the system; and high spatial resolution is provided, three modes such as three-dimensional tomography geometry imaging, spectrum detection and micro-region spectrum tomography imaging are provided, a new solving approach is provided for micro-region spectrum detection, and broad application prospects are provided in the fields of biomedicine, physical material science and the like.

The invention belongs to the technical field of optical precise measurement and relates to a super-resolution double-shaft differential confocal measuring method and a super-resolution double-shaft differential confocal measuring device. In the method and the device, pupil filtering technology is fused in a double-shaft confocal measuring structure, and a differential treatment method is used for receiving a measured light beam and carrying out treatment, thereby achieving the aims of improving resolution, expanding working distance, improving anti-interference capability and improving linear range. The invention can be used for precise measurement in such fields as micro-electronics, materials, industrial precise detection, biomedicine, etc.

The invention discloses an online measurement device and measurement method for the NO concentration in a high-NO2 and low-NO atmosphere. The online measurement device comprises an ozone generation unit, a connection pipe cleaning unit and a sampling pipe, wherein a connection reaction bin, an NO2 measuring instrument, a second mass flow meter and a first air pump are sequentially connected behind the sampling pipe; and the connection pipe cleaning unit comprises an electromagnetic three-way valve, an activated carbon tube, a current-limiting hole and a second air pump. By adopting a cavity-enhanced absorption spectroscopy, a sampling mode (actual atmosphere of ozone is added) or a zero point mode (actual atmosphere) is set through the electromagnetic three-way valve; absorption spectrum intensity signals of two modes are measured through an NO2 measuring instrument as a sampling spectrum and a reference spectrum respectively, and then NO in the atmosphere is converted into a concentration value of the NO2 through spectral fitting, that is to say, measurement of the NO concentration in the atmosphere environment is achieved, so that the online measurement device and measurement method have the characteristics of being free of NO2 concentration interference, a low detection limit, high sensitivity, high temporal-spatial resolution, high stability and low cost.

The invention provides an instrument holding mechanical arm used for a minimally-invasive robot, and relates to the instrument holding mechanical arm. The instrument holding mechanical arm solves the problems that the number of passive joints is large when an existing mechanical arm is arranged in a concentrated mode and the existing mechanical arm is large in overall size and low in rigidity when a passive arm is too long. The instrument holding mechanical arm comprises vertical horizontally-moving safety brake devices, passive joints, first joints, second joints and an integrated operative instrument drive device. One ends of the passive joints are arranged on the upper portions of the vertical horizontally-moving safety brake devices in a rotatable mode. One ends of the first joints are connected to the passive joints in a rotatable mode. One ends of the second joints are connected with the other ends of the first joints in a rotatable mode. The integrated operative instrument drive devices are arranged at the other ends of the second points. The instrument holding mechanical arm is used for operative instrument drive of the micro operative instruments of the robot.

The invention relates to a laser radar system for simultaneously detecting multiple atmospheric parameters at high precision on the basis of a three-channel F-P etalon. The laser radar system is characterized in that the channel I, the channel II, and the channel III of the three-channel F-P etalon are designed for signal separation, wind speed detection, and temperature detection respectively; atmospheric back-scattered light enters the channel I of the etalon via a branch of a third 1*2 optical fiber coupler and the a-to-b path of a first optical circulator so as to be separated; a Mie signal transmits and enters the channel II of the etalon; transmission and reflection signals of the channel II are simultaneously received by using a second optical circulator; a Rayleigh signal is reflected and enters the combining end of a fifth 1*2 optical fiber coupler via the b-to-c path of the first optical circulator and most signals enter the channel III of the etalon via a branch of the fifth 1*2 optical fiber coupler. The laser radar system has advantages of simultaneously detecting atmospheric parameters, such as the atmospheric wind field, the temperature, and the aerosol optical characteristics of the troposphere at high precision, and overcoming defects of large inversion errors or low detection precision of conventional single-parameter detection technology.

The invention provides an absolute measurement method for measuring the current dependence of direct-current standard resistors by utilizing multiplied current, which belongs to the field of direct-current resistor measurement. The method adopts an equivalent resistor as a reference resistor, two four-terminal standard resistors with the same nominal value are connected in series to form the equivalent resistor, the reference resistor and a measured resistor are connected with a direct current comparator bridge, a direct current comparator range expander is then connected, and thereby a testing circuit is formed; the direct current comparator range expander is used for multiplying the current flowing through the measured resistor while keeping the current in the reference resistor unchanged; and by measuring the resistance change of the measured resistor caused by the multiplied current, the method can realize the absolute measurement of the current dependence of the measured resistor. The method can be utilized to carry out the absolute measurement of the current or power dependence of standard resistors, and the uncertainty of measurement does not depend on the measuring accuracy of the DCC resistor bridge as well as the power variation of the reference resistor.

The invention relates to an integrated surgical instrument drive device, in particular to an integrated surgical instrument drive device with a decoupling function so as to solve the problems that due to the arrangement mode of a drive motor of an existing surgical instrument, drive torque of joints is increased, a system shakes easily, and meanwhile translational motion of the surgical instrument is generally driven in a nut lead screw mode, which is unbeneficial for adjusting the position of the surgical instrument before an operation. The drive device comprises a power source assembly (A), a decoupling transition assembly (B), a connector assembly (C) and a plurality of winding wires (D). The power source assembly (A), the decoupling transition assembly (B) and the connector assembly (C) are sequentially staggered and stacked in a sliding mode from bottom to top, and connected through the winding wires (D) in a decoupling winding mode. The drive device is used for driving a surgical instrument of a robot surgical micro-instrument.

The invention provides a track lofting gauge. The track lofting rule comprises a main beam, a fast wheel and a measuring wheel, wherein the main beam has the upper part provided with a track gauge sensor and an inclination sensor and the lower part provided with a left rail beam and a right rail beam; a rail-top prism and the fast wheel are arranged on the upper side and the lower side of the left rail beam respectively; a center prism is arranged on the main beam, and the center point of the center prism is arranged on the connection line between lower ends of the left rail beam and the right rail beam; the measuring wheel is arranged on one end of a support bar of the measuring wheel, and the track gauge sensor is arranged on the other end of the support bar of the measuring wheel; a pull rod is connected with the support bar of the measuring wheel; the main beam is also provided with an electric control box provided inside with a single-board computer; the track gauge sensor and the inclination sensor are connected with the electric control box by cables respectively. The track lofting gauge can automatically measure coordinates of the rail-top prism and the center prism by an electric total station, thereby realizing the absolute measurement of the three dimensional coordinates of the track center.

The invention provides a detection device and method, wherein the detection device is simple in structure and accurately detects parallelism of two split beams at the two sides of a prism of a detected lens. A main body of the detection device comprises an autocollimator, an angular instrument, a plane detection platform, a three-dimensional autocollimator adjusting base and a lens base; the detection device is combined with the detection method, and the absolute value, in the horizontal direction and the vertical direction, of the parallelism of the split beams of the optical lens can be detected. Non-contact type measurement is adopted for the detection device and method, the device is convenient to put up and dismount, easy to operate, good in detection repeatability, high in precision and low in cost, repeated accuracy can reach 2', and main components, namely the autocollimator and the angular instrument, of the device can be dismounted in any time and used for other detection purposes.

The invention relates to a reflection type spectral pupil differential confocal-photoacoustic microimaging device and method, and belongs to the field of confocal microimaging technologies and photoacoustic microimaging technologies. The structures and the functions of a spectral pupil differential confocal microimaging system and a photoacoustic imaging system are organically combined; the spectral pupil differential confocal microimaging system is used for detecting spatial structure information of a biological sample, and the photoacoustic microimaging system is used for detecting functional information of the biological sample, so that simultaneous detection of the spatial structure information and the functional information of the biological sample can be realized, and in-situ and noninvasive real-time imaging of a biological living body is expected to be realized. By adoption of a spectral pupil differential confocal imaging technology, the axial resolution and the working distance of the spectral pupil differential confocal-photoacoustic microimaging device can be effectively compatible, so that interference of stray light on a focal surface can be suppressed; the signal-to-noise ratio of the system is high; therefore, integrated and handheld design of the spectral pupil differential confocal-photoacoustic microimaging device can be facilitated.

The invention relates to an aircraft health state monitoring system based on distributed fiber sensing, and belongs to the technical field of intelligent sensing. The health state monitoring system comprises a laser signal source, a first optical coupler, sensing fibers, a frequency-shift reference optical path modulation module, a detection pulse optical path modulation module, a coherent detection module, a circulator and a data processing module. The system solves the problem that the health state of an aircraft cannot be monitored online in real time due to a present aircraft health state monitoring system has too much manual intervention and is influenced by artificial factors greatly; distributed fiber sensing is sensitive to environment change, and the fibers are light, thin, high in anti-electromagnetic interference capability, resistant to corrosion, high in stability, capable of realizing absolute measurement, easy to reuse and capable of being buried in an engineering structure; and the work process of the system needs no artificial intervention, the cost of labor and material cost is reduced, and the thermal field, bearing and other states of the aircraft can be monitored online in real time.

The invention belongs to the technical field of gas refractive index measurement, and in particular relates to a large-scale gas refractive index real-time measuring system. A vacuum chamber with a variable chamber length comprises three mirrors W1, W2 and W3, a vacuum chamber is formed by the mirrors W1 and W2, and the chamber length of the vacuum chamber can be changed by changing of the position of the mirror W1; the mirrors W2 and W3 are fixed, and air is between the mirrors W2 and W3; a laser interference system comprises four laser interference optical paths, light beams respectively enter the vacuum chamber with the variable chamber length from different positions, a light beam 1 is reflected by the mirror W1, a light beam 2 is reflected by the mirror W2 after passing through the mirror W1 and the vacuum chamber, a light beam 3 is reflected by the mirror W3 after passing through the mirror W1, the mirror W2 and the vacuum chamber, a light beam 4 is reflected by the mirror W3 after passing through the mirrors W1 and W2 and the air. Through comparing of phase differences of interference signals before and after the change of the chamber length of the vacuum chamber, absolute gas refractive index measurement can be realized, and by real-time measurement of the phase change of the optical path difference of the optical paths inside and outside the vacuum chamber, gas refractive index real-time measurement can be realized.