Abstract: A rotary color scanner has both linear and logarithmic mode static and dynamic calibration to quickly and automatically calibrate the scanner before each scan, as well as during a given scan, without operator intervention of any kind, whether in the factory or in the field. Close calibration is achieved, despite the use of photomultiplier detectors which are inherently particularly susceptible to drift, and despite the use of high intensity lamps whose output typically varies greatly with aging. The system establishes operation at an optimized data throughput rate up to a limit determined by the maximum scan rate of the system, and thereafter switches to operation at an optimized signal/noise ratio.

Abstract: A rotary color scanner has both linear and logarithmic mode static and dynamic calibration to quickly and automatically calibrate the scanner before each scan, as well as during a given scan, without operator intervention of any kind, whether in the factory or in the field. Close calibration is achieved, despite the use of photomultiplier detectors which are inherently particularly susceptible to drift, and despite the use of high intensity lamps whose output typically varies greatly with aging. The system establishes operation at an optimized data throughput rate up to a limit determined by the maximum scan rate of the system, and thereafter switches to operation at an optimized signal/noise ratio.

Abstract: An intrusion detector has a first sensor for monitoring a first condition and a second sensor for monitoring a second condition in a space to be protected against intrusion; a change in the condition sensed by the first sensor in a target area causes the second sensor to be aligned with the same target area; and if both sensors indicate a change in the respective conditions that they monitor an intrusion is indicated.

Abstract: An automatic fire detection system characterized by an extremely low incidence of false alarms utilizes two detection channels, one fed by an infrared (IR) detector and the other by an ultraviolet (UV) detector. Signal processing electronics in each channel produce a normalized output signal proportional to the power of incident IR and UV radiation within specific bandwidths. The system features a ratio detector that repeatedly forms a ratio of the normalized IR and UV inputs and compares the ratio to a known range of values for this ratio that are characteristic of a fire. A discriminator connected to the output of the ratio detector generates a fire alarm signal only if the majority of these ratio comparisons are fire-indicating. The system also includes a feedback loop in the IR processing channel that automatically adjusts the output of the channel to compensate for time-varying background IR radiation such as sunlight.

Abstract: An electroacoustic transducer especially for use in intrusion alarm systems and comprising a metal diaphragm having a thickness-poled piezoelectric ceramic disk bonded to the center thereof and having an electrode surface in contact with the metal diaphragm. An integral tab outwardly extends from the diaphragm to provide one electrical terminal, while the other electrical terminal is provided by a flexible electrical ribbon connection to the other electrode of the ceramic disk. An acoustically massive clamp ring attached to the periphery of the diaphragm defines the area of vibration. The vibrating assembly is mounted within a plastic housing having a chamber configured and dimensioned to improve the electroacoustic performance of the transducer structure. Various pattern directors can be employed with the transducer to achieve shaping of the pattern.