Abstract:
The laminate structure comprises a liquid crystal polymer substrate attached to a test surface of an article. A light absorbing coating is applied to the substrate and is thin enough to permit bonding steric interaction between the liquid crystal polymer substrate and an overlying liquid crystal monomer thin film. Light is directed through and reflected by the liquid crystal monomer thin film and unreflected light is absorbed by the underlying coating. The wavelength of the reflected light is indicative of the shear stress experienced by the test surface.
Abstract:
A force sensor and related method for determining force components. The force sensor includes a deformable medium having a contact surface against which a force can be applied, a signal generator for generating signals that travel through the deformable medium to the contact surface, a signal receptor for receiving the signal reflected from the contact surface, a generation controller, a reception controller, and a force determination apparatus. The signal generator has one or more signal generation regions for generating the signals. The generation controller selects and activates the signal generation regions. The signal receptor has one or more signal reception regions for receiving signals and for generating detections signals in response thereto. The reception controller selects signal reception regions and detects the detection signals. The force determination apparatus measures signal transit time by timing activation and detection and, optionally, determines force components for selected cross-field intersections. The timer which times by activation and detection can be any means for measuring signal transit time. A cross-field intersection is defined by the overlap of a signal generation region and a signal reception region.
Abstract:
A touch sensitive device is arranged with substantially parallel surfaces which are at least partially transparent to light. A flexible membrane is supported above the top surface of the screen and when the overlay is flexed into contact with the screen, light which had passed through the screen, is trapped between the screen surfaces by total internal reflection. The edges of the screen are fitted with light detectors for gathering the trapped light. Using this arrangement positional determination of one or more screen touches is possible.
Abstract:
The invention relates to an optoelectromechanical apparatus for measuring physical parameters, as pressure or force, comprising an emitting optical fibre coupled via its input with a light source, receiving optical fibre connected over its output to signal processing means and a carrier including a resilient member for bearing the emitting and the receiving optical fibres, wherein the input of the receiving optical fibre is in optical coupling with the output of the emitting optical fibre, advantageously through a spacing and the processing means comprise a first and a second photodiodes for detecting light of the light source and the light output of the receiving optical fibre.
Abstract:
A pressure deformable body of a transducer is formed with a plurality of passage holes through which paths are established for a signal medium conducted thereto through a rigid base on which the body is mounted. Portions of the body material when loaded bulge into the passage holes causing constriction thereof to vary the intensity of the signal medium transmitted. The passage holes are spaced in an array arranged to distribute hole constriction in a load-pattern reproducing manner.
Abstract:
There is disclosed a tactile sensor comprised of a compliant overlay having a surface of spatially dispersed semi-spherical domes in registration with sequentially pulsed signal means, such as light emitting diodes. The domes adaptively collapse upon the application of pressure applied to the opposite surface of the overlay entrapping signals by reflection between the overlay surfaces. The entrapped signals migrate by reflection to the edges of the overlay for reception by photodetectors. The output from the photodetectors is then processed for determining the magnitude, location and profile of the pressure applied across the overlay. A feedback arrangement is also provided for controlling the magnitude of the externally applied pressure.
Abstract:
This invention is a two-dimensional pressure sensor which can be used to determine a pressure distribution across a two-dimensional object which comes in contact with the sensor. The sensor includes a light source, a matrix of light transmitting fiber endings which includes an alternate pattern of transmitting and receiving light fibers, a transmitting fiber sub-array located a distance from the matrix and composed of transmitting fibers, a receiving fiber sub-array located a distance from the matrix and composed of receiving fibers, a semi-transparent deformable medium located above the matrix, a retro-reflective material located on top of the deformable medium, a flexible membrane located adjacent said retro-reflective material and positioned to contact an object, and apparatus such as a photodetector array, for detecting light which is reflected by the retro-reflective material and transmitted to the receiving fiber sub-array.
Abstract:
A touch sensitive device is arranged with substantially parallel surfaces which are at least partially transparent to light. A flexible membrane is supported above the top surface of the screen and when the overlay is flexed into contact with the screen, light which had passed through the screen, is trapped between the screen surfaces by total internal reflection. The edges of the screen are fitted with light detectors for gathering the trapped light. Using this arrangement positional determination of one or more screen touches is possible.
Abstract:
A method for measuring pressures which comprises allowing a material whose pressure is to be measured to press against a recording sheet to form a color image due to the pressure, and evaluating the changes in the optical color density of the color hue of the resulting color image on the recording sheet, the color image formation due to the pressure being effected by contacting a synthetic polymer microcapsule layer containing a color former with a color developer layer under pressure, said microcapsule layer and said color developer layer being coated on the same surface of the support.
Abstract:
A pressure measurement sheet comprises a support and a layer containing microcapsules provided thereon, wherein the ratio of the number average wall thickness (.delta.) to the volume average particle diameter (D) of the microcapsules lies in the range: .delta./D = about 1.5 .times. 10.sup.-.sup.3 to about 3.0 .times. 10.sup.-.sup.2. A method of measuring pressure by the use of the pressure measurement sheet described above comprising the steps of contacting the pressure measurement sheet with the area to be measured, applying pressure to form color and determining the applied pressure from changes in optical densities or hues, where the color is formed through contact under pressure between a layer containing microcapsules and a layer containing an adsorbent.
Abstract translation:压力测量片材包括载体和其上提供的含有微胶囊的层,其中微胶囊的数均壁厚(delta)与体积平均粒径(D)的比值在以下范围内:δ/ D =约1.5 3×10 -3〜约3.0×10 -2。 通过使用上述压力测量片测量压力的方法包括以下步骤:使压力测量片材与待测量的区域接触,施加压力以形成颜色,并根据光学密度或色调的变化确定施加的压力,其中 通过在包含微胶囊的层和含有吸附剂的层之间的压力下接触形成颜色。