Abstract: A graphical code reader is disclosed. The graphical code reader includes an image sensor. A first lens is provided for focusing light reflected from a graphical code to form a first image on a first region of the image sensor. A second lens is provided for focusing light reflected from the graphical code to form a second image on a second region of the image sensor. The first lens is separated from the image sensor by a first distance, and the second lens is separated from the image sensor by a second distance. The first distance is greater than the second distance. A decoder is also provided for processing image data to obtain information contained in the graphical code.

Abstract: The present invention provides a novel optical reader device and method for calibrating the device. The device executes a calibration module that locates the actual coordinates for a targeting symbol in a captured image. The coordinates are stored as calibration coordinates in the memory. During normal operation of the reader device, the stored calibration coordinates are used to locate a target, such as a bar code. In order to locate the targeting symbol, the calibration module may overlay a template on clusters that may be the targeting symbol. A reasonable accurate comparison identifies the cluster as the targeting symbol. Alternatively, the calibration module may approach a cluster from four frames of the image and identify the cluster's tangents and perimeter. Geometrical calculations are used to identify the center of an identified targeting symbol.

Abstract: An electrolytic cell for measuring the concentration of a species such as oxygen is constructed by depositing closely spaced interleaved inert electrode surfaces on the surface of an insulating substrate and covering the electrode surfaces with a thin film of electrolyte and permeable membrane. The electrolyte is selected so that the species being measured is generated at one electrode surface and consumed at the other with no net reaction in the electrolyte. Alternatively, a cylindrical configuration may be formed by closely winding two thin electrode wires about a cylindrical base and covering with an electrolyte and a membrane.