摘要:
A two-piece fastener assembly for securing thermoplastic roof membranes to an underlying roof deck having: a stress plate and a fastener. The stress plate consists of a pre-fabricated metal layer and a thermoplastic layer which are integral with each other. The stress plate has top having three flat surfaces and two circumferential portions, forming ridges or protuberances connecting the flat surfaces. In a method aspect the steps of securing thermoplastic roof membranes to an underlying roof deck, includes: placing a first thermoplastic roof membrane on the roof deck; placing a line of stress plates on the marginal portion of the first thermoplastic roof membrane and securing the stress plates along with the first thermoplastic roof membrane to the roof deck by use of the fastener; placing a second thermoplastic roof membrane to overlap the line of stress plates and the marginal portion of the first thermoplastic roof membrane; and applying heat and pressure to the line of stress plates and the overlapped portion of the first and second thermoplastic roof membranes to fuse them together and provide a waterproof covering over the roof deck.
摘要:
A modular dual-beam source, sample compartment and beam-combining system are provided when used with a monochromator and detector to form a spectrophotometer consisting of: (a) a source module where two ellipsoidal mirrors each produce an image of the light source, and (b) a reflecting sample-compartment module, wherein each side has two plane-mirrors, of the four plane mirrors, three are reference and one is the sample, or (c) a transmission sample-compartment module, wherein each side has two plane-mirrors, and a sample is placed between one pair of plane-mirrors, and (d) a beam-combining module wherein the source images are imaged by a second pair of ellipsoidal mirrors on a reflective chopper that combines the images at a single location that is imaged, external to the module, by another mirror, each module being kinematically located with respect to each other so the system remains optically aligned as modules are interchanged.
摘要:
This invention provides a method and apparatus for mapping the surface of an object, in particular, a transparent object such as anterior and posterior surfaces of a patient's cornea, in a clinically useful time using a single optical system. In a preferred embodiment, a pattern generator projects a pattern of light and dark areas onto a patient's cornea, and a light detector receives patterns reflected from the anterior and posterior surfaces of the cornea. A mapping means generates a three-dimensional map of the anterior and posterior corneal surfaces from information regarding the projected and detected light patterns. The invention can be used to map other transparent objects such as a contact lens or an intraocular device, e.g., an intrastromal ring. The invention can also be used to map the surface of an opaque object.
摘要:
A device and method for subaperture stray light detection and diagnosis. A test light beam is generated. Stray light is detected. Based on the detected stray light, potential paths that light may have taken to arrive at the detection surface are determined. A testing device comprises a test light beam source whereby the cross sectional area of the test light beam is made less than the cross sectional area of the system aperture. A relative lateral positioning stage and an angular beam directing stage launch the test light beam into the aperture. A detector and a data processing system produce a data set relating the stray light to the location and directional angles of the test light beam to identify the sources of stray light. A light trap and test light beam delivery system are provided.
摘要:
A single ply mechanically embossed roofing membrane in a roll form for use in commercial applications on flat and low pitched roofs. The roofing membrane preferably includes a scrim or reinforcement sheet sandwiched between a top layer and a bottom layer, wherein the bottom layer is completely embossed with various configurations forming alternating ridges and valleys. The embossed roofing membrane improves roll blocking upon installation. The embossed roofing membrane can be installed by fully adhering or mechanically attaching to the roof deck.
摘要:
A method and apparatus for color calibrating an imager device is disclosed. The imager device is subjected to a plurality of light sources. Color channel responses are obtained from the imager device and the color calibrating coefficients are determined.
摘要:
An interferometer is provided, comprising a source, a unit under test (UUT) with at least a first surface and second surface, a reflective optic, a detector and light from the source. The light is transmitted through the unit under test and reflects off of the reflective optic, which directs the light back to the unit under test. A first portion of light is reflected off the first surface of the UUT. A second portion of light is reflected off the second surface of the UUT. The first and second portions of light are then reflected by the reflective optic and are then transmitted through the UUT. The two portions of light are incident on the detector, where the first and second portions of light coherently add and the interference pattern is detected by the detector. A method for measuring the transmitted wavefront of the UUT is also provided.
摘要:
A test surface of a test object is measured with respect to a reference surface to generate a first relative surface measurement, where the test surface is in a first position relative to the reference surface. The test surface is measured with respect to the reference surface to generate a second relative surface measurement, where the test surface is in a second position relative to the reference surface different from the first position. Estimates of a rotationally varying part of a measurement of the test surface and a rotationally varying part of a measurement of the reference surface are provided. An estimate of a rotationally invariant part of the measurement of the test surface is calculated at a plurality of radial values based on a combination of the relative surface measurements, the provided estimates, and a difference between the first and second relative positions.