Photoelectric Sensor Array Size Identification via Readout Register Discontinuity
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Solution Overview
Problem
Current imaging systems require manual intervention to identify sensor types and sizes, relying on EPROMs or EEPROMs for sensor recognition, which adds cost and complexity, and lack automatic identification of sensor defects and warranties.
Innovation Solution
The method involves using readout registers, clock means, discontinuity detection, and counters to determine sensor array sizes and types by analyzing charge accumulation and dark current integration, generating a unique signature for each sensor to enable automatic identification and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual identification of sensor types is used, then sensor type can be identified, but operator attention is diverted from patient and time is lost
Solution Approach 1:
The sensor array performs self-identification by automatically generating and outputting identification signals that contain information about the number of pixels and lines. The imaging system receives these signals automatically without requiring manual intervention, enabling the sensor to identify itself rather than requiring external identification by an operator.
2Extent of automation
If EPROM is used for sensor identification, then sensor type can be identified automatically, but cost and complexity increase
Solution Approach 1:
The identification function is extracted from external memory devices (EPROM/EEPROM) and implemented directly within the sensor array's existing readout register circuitry. The identification signal is generated by the sensor itself through its normal charge transfer and readout operations, eliminating the need for separate identification memory components.
Solution Approach 2:
The readout register circuitry performs dual functions: it reads out image charge from the sensor pixels and simultaneously generates identification signals about the sensor's dimensions. This multi-functionality eliminates the need for separate identification hardware, reducing overall system complexity while maintaining automatic identification capability.
3Extent of automation
If EPROM/EEPROM is used for sensor identification, then sensor type can be identified, but additional cost is incurred
Solution Approach 1:
The identification function is extracted from external memory devices (EPROM/EEPROM) and implemented directly within the sensor array's existing readout register circuitry. The identification signal is generated by the sensor itself through its normal charge transfer and readout operations, eliminating the need for separate identification memory components.
4Ease of operation
If fixed clocking scheme is used, then imaging operation is simplified, but adaptability to different sensor sizes is reduced
Solution Approach 1:
The clocking scheme transitions from fixed to dynamic by using the identification signal to automatically determine the appropriate clocking parameters. The system adapts the clocking frequency and timing based on the detected sensor dimensions, allowing optimal imaging operation across different sensor sizes without manual reconfiguration.
Solution Approach 2:
The identification signal provides feedback about the sensor's pixel and line counts to the imaging system. This feedback enables the imaging system to automatically adjust operating parameters including clocking schemes, ensuring optimal performance for the specific sensor type connected without requiring manual intervention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for automatic and cost-effective identification of sensor types and defects, enabling optimal bias settings and image corrections without the need for external memory devices, improving operational efficiency and reducing errors.
Implementation Method 1
a photoelectric sensor array size and in particular a CCD sensor array size
Data Source
AI summary
In a size determining system, a number of pixels in a dimension of a sensor array of photoelectric devices is determined. A readout register is arranged to receive charge accumulated in the dimension of the sensor array. A clock is connected to apply clock cycle pulses to the readout register to read out the charge from the readout register for a predetermined number of clock cycles known to exceed a supposed maximum number of pixels in the dimension of the sensor array. A discontinuity detector is operative to determine a first discontinuity in the readout charge, representing a last active pixel in the dimension of the sensor array. A counter is arranged to count clock cycles between a first active pixel and the first discontinuity to determine a number of active pixels in the dimension of the sensor array.