Position sensing detector focal plane array (PSD-FPA) event detection and classification system
First Claim
1. An optical event detection system, comprisingan optical sensor module andan electronic control module electrically connected to the optical sensor module,wherein the optical sensor module comprises an optical lens sub-system, wherein the optical lens sub-system has a lens, one or more optical sensors having focal plane arrays comprising one or more position sensing detector focal plane arrays (PSD-FPA), and electronics;
- and wherein each of the one or more PSD-FPA include detector elements that are lateral effect diode elements, wherein each detector element is comprised of a sensing surface and four signal sensing connections.
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Abstract
An event detection and classification system uses a new type of optical sensing component, a Position Sensing Detector Focal Plane Array (PSD-FPA). The PSD-FPA provides for high-speed operation that allows for accurate sensing of fast artifacts that are unique to weapons fire and enables precise location of optical phenomenon. The system detects and classifies events, particularly weapons fire, and rejects false alarms. An optical lens sub-system focuses light onto a PSD-FPA, which senses the photons and generates electrical signals associated with individual elements of the PSD-FPA. These signals are processed to identify and classify weapons-related or other events. Background subtraction, variable gain, time-intensity and time-location correlation, digital filtering, Fourier analysis, and wavelet analysis are all used to successfully classify the events while rejecting false alarms.
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Citations
54 Claims
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1. An optical event detection system, comprising
an optical sensor module and an electronic control module electrically connected to the optical sensor module, wherein the optical sensor module comprises an optical lens sub-system, wherein the optical lens sub-system has a lens, one or more optical sensors having focal plane arrays comprising one or more position sensing detector focal plane arrays (PSD-FPA), and electronics; - and wherein each of the one or more PSD-FPA include detector elements that are lateral effect diode elements, wherein each detector element is comprised of a sensing surface and four signal sensing connections.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An optical event detection and classification method, comprising
providing an optical sensor module comprising one or more position sensing detector focal plane arrays (PSD-FPA), which each comprise a detector and a read out integrated circuit (ROIC), an optical lens sub-system that comprises one or more lenses, and a control and input/output (I/O) component, providing an electronic control module, focusing light onto the one or more PSD-FPA with the optical lens sub-system, sensing photons and generating electrical currents with the detector, amplifying and sampling the electrical currents with the ROIC, transmitting the amplified and sampled electrical currents to the control and I/O component, digitizing and multiplexing the amplified and sampled electrical currents with the control and I/O component, transmitting the digitized and multiplexed electrical currents to the electronic control module, receiving the transmitted electrical currents in the electronic control module, and interpreting the received electrical currents to detect and characterize events.
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50. A method of signal processing for detecting events of interest, comprising
receiving data from a sensor with one or more sensor elements, organizing the data into one or more data windows that each contain data from one of the one or more sensor elements organized in time sequence, calculating an average sample-to-sample signal change of the data in one of the one or more data windows, autonomously determining an event detection threshold for the one data window based on the average sample-to-sample signal change of the data, determining whether the one data window contains a pulse or signal rise that exceeds the event detection threshold, and discarding the one data window if it does not contain a pulse or signal rise that exceeds the event detection threshold, thereby minimizing the amount of signal processing required.
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51. An event detection and classification method, comprising:
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providing one or more sensors, each having one or more sensor elements, sensing and generating sensor data with the one or more sensors, and processing the sensor data to identify and categorize events of interest, wherein the processing the sensor data comprises performing background subtraction, time-intensity and time-location correlation, and wavelet analysis. - View Dependent Claims (52, 53, 54)
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Specification