Resources Contact Us Home
Assay apparatus having piezoelectric slab generating effective diffraction grating in applied analyte-specific film

Image Number 2 for United States Patent #4767719.

A method and apparatus for assaying a species in a biological sample fluid. The apparatus comprises an SAW device (1) comprising a slab (2) of piezoelectric material on the upper surface (5) of which is formed an input transducer (3) and an output transducer (4). A source of RF energy is applied to the input transducer to generate a surface acoustic wave. Applied to the surface (5) is a thin layer (8) of a material capable of binding a species to be assayed. The sample (13) to be tested is applied to the top of the layer (8). A collimated light beam (1) from a source (9) is applied to the thin film from underneath the slab (2) and is collected by a photodetector (12). When the slab (2) is energized, the vibration sets up an effective diffraction grating which is coupled to the thin film and acts to diffract the light beam (10) applied to it. The energy in the diffracted beam, as measured by the photodetector ( 12), is indicative of the progress and result of the reaction between the layer 8 and the sample.

  Recently Added Patents
Soybean cultivar CL1013663
Live-attenuated compositions for bacterial infections
Fuel cell system, and electric vehicle equipped with the fuel cell system
Contact detection between a disk and magnetic head
Web development environment that enables a developer to interact with run-time output presentation of a page
Linear book scanner
Spectral measurement device
  Randomly Featured Patents
Apparatus for microbiological analysis of biological samples in liquid suspension by light-scattering technique
Obscuring an accelerometer signal
Racing stripe on mouse
Airbag cushion exhibiting low fabric usage and simultaneously high available inflation volume
Coaster container
Shared lines equipment, especially for B-ISDN switching system
Chrysanthemum plant named `Delistar`
Multilayer printed circuit board
Feeding apparatus
Insecticidal matrix and process for preparation thereof