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51results about How to "Different sensitivity" patented technology

Method and apparatus for measuring bandwidth of a laser output

InactiveUS6952267B2Mitigate and similar errorDifferent bandwidthRadiation pyrometryInterferometric spectrometryFrequency spectrumLength wave
A method and apparatus for measuring bandwidth of light emitted from a laser which may comprise: first and second wavelength sensitive optical bandwidth detectors providing, respectively, an output representative of a first parameter indicative of the bandwidth of the emitted light as measured respectively by the first and second bandwidth detectors, and an actual bandwidth calculation apparatus adapted to utilize these two outputs as part of a multivariable linear equation employing predetermined calibration variables specific to either the first or the second bandwidth detector, to calculate a first actual bandwidth parameter or a second actual bandwidth parameter. The first actual bandwidth parameter may be a spectrum full width at some percent of the maximum (“FWXM”), and the second actual bandwidth parameter may be a portion containing some percentage of the energy (“EX”). The first and second bandwidth detectors may an etalon and the outputs may be representative of a fringe width of a fringe of an optical output of the respective etalon at FWXM. The precomputed calibration variables may be derived from respective three dimensional plots representing, respectively, detector outputs in relation to a calibrating input light with known values of the first and second actual bandwidth parameters.
Owner:CYMER INC

Dual-parameter optical fiber sensor for temperature and stress based on coaxial optical fiber

The invention relates to a coaxial optical fiber-based temperature and stress dual-parameter optical fiber sensor which is formed by sequentially connecting a single mode input optical fiber, a first coaxial optical fiber, an intermediate single mode optical fiber, a second coaxial optical fiber and a single mode output optical fiber, wherein the single mode input optical fiber, the first coaxialoptical fiber and the intermediate single mode optical fiber are sequentially welded to form a first sensing unit; and the intermediate single mode optical fiber, the second coaxial optical fiber andthe single mode output optical fiber are sequentially welded to form a second sensing unit. The first coaxial optical fiber and the second coaxial optical fiber have different structural parameters, the first sensing unit and the second sensing unit have resonance filtering spectrums with different wavelengths; and the two resonance filtering spectrums have different sensitivities for two parameters, namely the temperature and the stress, thereby the dual-parameter optical fiber sensor can be realized. The coaxial optical fiber-based temperature and stress dual-parameter optical fiber sensor disclosed by the invention has the advantages of simple preparation process, low cost, compact structure, stable performance, easiness for integration with a standard single mode optical fiber system,and the like.
Owner:SHANGHAI UNIV

Optical bandwidth meter for laser light

ActiveUS20050007600A1Little computational overheadSimple equationRadiation pyrometryInterferometric spectrometryFrequency spectrumLaser light
A method and apparatus for measuring bandwidth of light emitted from a laser is disclosed which may comprise: a first and second wavelength sensitive optical bandwidth detectors providing, respectively, an output representative of a first parameter indicative of the bandwidth of the emitted light as measured respectively by the first and second bandwidth detectors, and an actual bandwidth calculation apparatus adapted to utilize these two outputs as part of a multivariable linear equation employing predetermined calibration variables specific to either the first or the second bandwidth detector, to calculate a first actual bandwidth parameter or a second actual bandwidth parameter. The first actual bandwidth parameter may be a spectrum full width at some percent of the maximum (“FWXM”), and the second actual bandwidth parameter may be a portion containing some percentage of the energy (“EX”). The first and second bandwidth detectors may an etalon and the outputs may be representative of a fringe width of a fringe of an optical output of the respective etalon at FWXM. The precomputed calibration variables may be derived from respective three dimensional plots representing, respectively, detector outputs in relation to a calibrating input light with known values of the first and second actual bandwidth parameters, which may be FWXM and EX. The first/second three dimensional plot may provide a solution: (first/second output)=(a/d*(calibrating input light known value of FWXM))+(b/e*(calibrating input light known value of EX)+c/f; and the actual bandwidth calculation apparatus may use the derived equation: (first actual bandwidth parameter)=((b*(second output))−(e*(first output))+ce−bf)/(bd−ae), or the equation: (second actual bandwidth parameter)=((a*(second output))−(d*(first output))+cd−af)/(ae−bd). FWXM may be FWHM and EX may be E95. The transfer function of the first optical bandwidth detector may be selected to be much more sensitive to FWXM than to EX and the transfer function of the second optical bandwidth detector may be selected to be much more sensitive to EX than to FWXM.
Owner:CYMER INC

Laser multiple degrees of freedom precision measurement system based on telescope system

The invention relates to a laser multiple degrees of freedom precision measurement system based on a telescope system. The system comprises a moving mechanism and a fixed mechanism, and the moving mechanism generates three beams of parallel light; the fixed mechanism comprises a first measurement telescope mechanism, a second measurement telescope mechanism and a third measurement telescope mechanism which are arrayed in parallel; entrance ports of the three measurement telescope mechanisms respectively correspond to the three beams of parallel light which are emitted by the moving mechanism; exit ports are correspondingly provided with photoelectric receivers; and two reflectors and a lens are sequentially arranged between the exit port and the photoelectric receiver of the second measurement telescope mechanism. The system provided by the invention is used for measuring two straightness errors and three angle errors which are vertical to the proceed direction, and the light path adjustment is simple; less optical devices are used in the system, the system has the advantages of simple structures and small size is convenient for installation and adjustment, and the rapid measurement with high accuracy can be obtained; and the system can also finish six-degree-of-freedom full posture measurement together with length measuring technology such as a laser interferometer.
Owner:UNIV OF SCI & TECH OF CHINA

Graphene-based strain sensing film and preparation method and application thereof

The invention relates to a graphene-based strain sensing film and a preparation method and an application thereof. The strain sensing film is a composite coating film formed by an upper emulsion coating, a lower emulsion coating and an intermediate graphene coating, wherein both ends of the film are connected to a wire, the upper emulsion coating and the lower emulsion coating are prepared from an acrylate emulsion polymer, and the graphene coating is prepared from a graphene dispersion liquid. Compared with the prior art, the graphene-based strain sensing film can operate on any shapes of substrates, the method is simple and the cost is low; the graphene dispersion liquid is used to act as a raw material, electrical and mechanical properties of graphene are directly utilized, and the technological process is simplified; the emulsion coating is sprayed, so that the graphene coating is effectively protected from being damaged, the service life of the strain sensing film is prolonged, the reusability and the weather resistance of the strain sensing film are improved, and no adverse effects are imposed on the appearance of the strain sensing film at the same time because the applied polymer emulsion has high transparency after film formation; and the sensitivity of the strain sending film can be set at will according to requirements.
Owner:TONGJI UNIV

Intelligent sewage treatment device

The invention relates to the technical field of sewage treatment, and particularly relates to an intelligent sewage treatment device. The intelligent sewage treatment device comprises a cleaning module, two input shafts and a sewage collecting bin, wherein the cleaning module comprises a frame and a conveying belt; the sewage collecting bin is mounted on the frame through the input shafts; a power module and an impeller assembly are arranged on the sewage collecting bin; the power module is connected with the input shafts; the input shafts are connected with the conveying belt; and the input shafts are connected with the impeller assembly through a speed change mechanism. When the cleaning module rotates and drives a rotating column to rotate, the rotating column drives a main movable wheel of a driving wheel to move inwards so as to be away from a main fixed wheel, the transmission ratio is increased to reduce the rotating speed of the impeller assembly, thus, the intelligent sewage treatment device can dynamically match advancing and cleaning power of a garbage truck according to resistance generated by floating garbage in front, when the garbage in front is much, the power distributed to advancing by the power module is reduced, the power distributed to cleaning is increased, the cleaning effect is ensured, and the cleaning efficiency is improved.
Owner:启东市新港阀门仪表成套有限公司

Coaxial optical fiber-based temperature and stress dual-parameter optical fiber sensor

The invention relates to a coaxial optical fiber-based temperature and stress dual-parameter optical fiber sensor which is formed by sequentially connecting a single mode input optical fiber, a first coaxial optical fiber, an intermediate single mode optical fiber, a second coaxial optical fiber and a single mode output optical fiber, wherein the single mode input optical fiber, the first coaxialoptical fiber and the intermediate single mode optical fiber are sequentially welded to form a first sensing unit; and the intermediate single mode optical fiber, the second coaxial optical fiber andthe single mode output optical fiber are sequentially welded to form a second sensing unit. The first coaxial optical fiber and the second coaxial optical fiber have different structural parameters, the first sensing unit and the second sensing unit have resonance filtering spectrums with different wavelengths; and the two resonance filtering spectrums have different sensitivities for two parameters, namely the temperature and the stress, thereby the dual-parameter optical fiber sensor can be realized. The coaxial optical fiber-based temperature and stress dual-parameter optical fiber sensor disclosed by the invention has the advantages of simple preparation process, low cost, compact structure, stable performance, easiness for integration with a standard single mode optical fiber system,and the like.
Owner:SHANGHAI UNIV

MEMS absolute pressure sensor and processing method thereof

The invention provides an MEMS absolute pressure sensor and a processing method thereof. The sensor comprises a glass cover plate, a silicon pressure sensing film and a glass substrate. One side of the silicon pressure sensing film is in anodic bonding with the glass substrate to form two communicated vacuum reference cavities, the other side of the silicon pressure sensing film is in anodic bonding with the glass cover plate to form two independent open type gas pressure sensing structures, and the two communicated vacuum reference cavities correspond to the two independent open type gas pressure sensing structures up and down, and form a series mutual inductance double-capacitor structure with a silicon pressure sensing film, and a lead electrode is processed on the silicon pressure sensing film and used for leading out an air pressure detection signal. External air pressure is applied to the silicon pressure sensing film through the open type gas pressure sensing structure, pressure difference is formed between the external air pressure and the vacuum reference cavity to enable the silicon pressure sensing film to deform, then the distance between the silicon pressure sensing film and the capacitance plate of the glass substrate is changed, and the capacitance value is changed to reflect the external air pressure. The processing technology based on the sensor is few in steps, extremely high in qualified rate, good in long-term stability of products and convenient for large-scale batch production.
Owner:BEIJING RES INST OF TELEMETRY +1
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