摘要:
An apparatus stacks semiconductor wafers and spacers and clamps them in an axial alignment for mounting in a semiconductor wafer edge polishing machine. After edge polishing, the apparatus separates the wafers and spacers and delivers them respectively into separate cassettes for further processing or recycling.
摘要:
A ruggedized acousto-optic waveguide comprising a pair of inner plastic plates, a sheet of optical glass sandwiched flush between the inner plates with side edges exposed to ambient light, a transducer acoustically coupled with one end of the sheet of glass, a resilient pad overlaying one of the inner plates, a pair of cover plates mounted about and in compressive engagement with the pair of inner plates and resilient pad, and a set of compression springs coupled with the other end of the sheet of glass applying in-plane compression thereto.
摘要:
A biological sensing apparatus includes an excitation source configured to induce waves in a biological target, and an optical waveguide interferometer configured to sense the induced waves in the biological target. The optical waveguide interferometer includes a plurality of optical couplers and interconnecting optical fibers arranged to define a reference arm, a measurement arm, and a probe segment coupled to the reference arm and the measurement arm and having a probe segment end to be positioned adjacent the biological target. An optical path length adjustor is coupled to the reference arm. A controller cooperates with the optical path length adjustor and a first optical detector. The controller is configured to adjust an optical path length of the reference arm to maintain a constant relationship with respect to an optical path length of the measurement arm, and to generate biological target data based upon the first optical detector.
摘要:
A biological sensing apparatus comprises an excitation source configured to induce waves in a biological target, and an optical waveguide interferometer configured to sense the induced waves in the biological target. The optical waveguide interferometer comprises a probe segment having a probe segment end, and an adjustable coupler configured to permit setting a gap between the probe segment end and the biological target. A controller is coupled to the adjustable coupler and configured to set the gap between the probe segment end and the biological target.
摘要:
An optical profile determining apparatus includes an optical detector and an optical source. The optical source generates a transmit beam including a plurality of wavelengths, and generates a reference beam including the plurality of wavelengths. Optical elements direct the transmit beam to a target, direct a resulting reflected transmit beam back from the target to the optical detector, and combine the reference beam with the reflected transmit beam so that a profile of the target is based upon fringe contrast produced by the plurality of wavelengths in the reference beam and the plurality of wavelengths in the reflected transmit beam.
摘要:
Pixel clock and beam scan timing of an acousto-optic scanner are controlled by an acoustic velocity-driven, phase locked loop containing an adjustable voltage controlled pixel clock generator, which is controlled by a detector that produces delayed and attenuated replica of the excitation waveform applied to an ATWL scanner used to scan a light beam across a workpiece. In a first embodiment of the invention, an end-of-cell transducer converts the pressure induced traveling lens into an electrical signal replica of the excitation input. In a second embodiment, an end-of-scan optical pick-off monitor is employed to detect the scanned optical spot as it crosses its field of view. Each pixel is spatially invariant to propagation velocity changes in the ATWL medium, so that as variations in temperature change the speed of the pressure-induced lens traveling from the excitation transducer to the end of the ATWL cell on each scan, the pixel clock is correspondingly slowed down or speeded up by the same proportional amount, to maintain registration in time and space.
摘要:
An acoustic impedance-matching transformer includes a tapered acoustic energy transmission (metal) block, having an acoustic impedance less than that of a piezo-electric transducer in a metric direction toward that of the acoustic propagation medium of the waveguide, and by an amount that allows tailoring of the relative spatial dimensions of mating surfaces of the transducer and the block, so as to provide efficient broadband coupling of acoustic energy. The surface area of the end face of the block engaging the transducer is a corresponding fraction of the area of the transducer. The tapered block focuses acoustic energy toward the input aperture of the waveguide channel. The taper is determined in accordance with difference between the acoustic impedance of the aluminum block and that of a second acoustic wave propagation element, such as a quarter-wave section of plexiglass, interposed between the waveguide channel and the tapered block.
摘要:
An acoustic traveling wave lens structure for an acousto-optic scanner comprises a confined height fluid-containing channel, upon which a scanned optical beam to be modulated by a acoustic traveling wave is incident. The channel is bounded by spaced-apart walls that extend between a first end of the scanner channel, to which an acoustic transducer is coupled, and a second end of the channel that terminates an acoustic traveling wave launched from the acoustic transducer. The thickness of the channel is linearly tapered from the first end to the second end, so as to maintain a constant acoustic power density. To compensate for the attenuation in acoustic power through the water medium, the waveguide may be heated, to maintain the temperature of the liquid medium (water) within the waveguide channel within a prescribed temperature range over which the acoustic velocity remains substantially constant or undergoes a relatively small variation.
摘要:
A folded acoustic traveling wave lens arrangement imparts multiple passes of an incident optical beam through the traveling wave lens, and thereby effectively maximize utilization of acoustic power. A lens of optically transmissive bulk material, such as quartz, is disposed in the path of an incident light beam which is spatially scanned by a light beam deflector. The bulk material of the lens element has a reflective layer disposed upon at least one of its surfaces, and is configured such that an incident light beam undergoes multiple passes through the acoustic wavefront propagating through the lens, prior to emerging from the lens. Aberration in the emerging beam due to multiple passes through the bulk material is corrected by a pupil plane correction plate.
摘要:
A method and apparatus for measuring the repeat length (L) of a moving web includes forming a plurality of detectable marks along the length of the web at a repeated length interval. First and second detectors positioned along the web path are separated by a known distance (S). The repeat length of the web is obtained by detecting a mark moving past the first detector and then detecting a mark moving past the second detector, determining the time (t) separating the detections, and measuring the speed of the moving web (V), wherein the repeat length is calculated using the formula L=S+Vt.
摘要翻译:用于测量移动幅材的重复长度(L)的方法和设备包括以重复的长度间隔沿纸幅的长度形成多个可检测标记。 沿着幅材路径定位的第一和第二检测器被隔开已知距离(S)。 通过检测移动通过第一检测器的标记,然后检测移动通过第二检测器的标记,确定分离检测的时间(t)和测量移动幅材(V)的速度,获得纸幅的重复长度, 其中使用公式L = S + Vt来计算重复长度。