Photoconductor Readout Circuit for Real-Time Array Characterization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current calibration methods for photoconductor sensor arrays are time-consuming and prone to measurement errors due to environmental factors, necessitating a more efficient and reliable calibration process, especially during real-time operation.
Innovation Solution
A device comprising an array of photoconductors with a bias voltage source and a readout circuit that applies alternating or direct current bias voltages to determine response voltages proportional to characterizing variables like dark resistance, signal noise, and responsivity, allowing for real-time characterization and reduced calibration needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If regular calibration routines are performed for photoconductor sensor arrays, then measurement accuracy is maintained, but time consumption increases and productivity decreases
Solution Approach 1:
The photoconductor array performs self-characterization by measuring its own electrical resistance at different illumination levels. The device uses its own output signals to determine responsivity and detectivity parameters without requiring external calibration equipment or manual intervention, thereby eliminating time-consuming calibration routines while maintaining measurement accuracy
Solution Approach 2:
The system continuously monitors the photoconductor's electrical resistance and illumination level, using feedback signals to dynamically calculate and update responsivity and detectivity parameters. This real-time feedback mechanism allows the device to maintain accurate characterization without requiring periodic external calibration
2Stability of the object's composition
If calibration is performed at regular intervals, then parameter stability is maintained, but the device complexity and operational complexity increase
Solution Approach 1:
The photoconductor array autonomously characterizes itself by measuring its own electrical resistance at known illumination levels. The device uses its own output signals and built-in illumination sensors to calculate responsivity and detectivity, eliminating the need for complex external calibration equipment and procedures
Solution Approach 2:
The system performs preliminary characterization measurements during normal operation by continuously monitoring electrical resistance at different illumination levels. These preliminary data are used to establish baseline responsivity and detectivity parameters before actual measurement tasks, ensuring stability without requiring complex post-operation calibration
3Productivity
If photoconductor characteristics are measured during operation, then productivity increases, but measurement precision may be compromised due to environmental factors
Solution Approach 1:
The system continuously monitors the photoconductor's electrical resistance and illumination level in real-time, using feedback signals to dynamically calculate and update responsivity and detectivity parameters. This feedback mechanism allows accurate measurement during operation by compensating for environmental variations through continuous adjustment
Solution Approach 2:
The device performs multiple measurement cycles at different illumination levels during normal operation, collecting excess data that can be used to average out environmental noise and improve measurement precision. By performing more measurements than strictly necessary, the system compensates for the challenges of real-time operation
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
Enables fast, reliable, and less complex characterization of photoconductor arrays, reducing measurement errors and allowing for real-time operation with fewer calibration requirements, while maintaining accurate responsivity and detectivity estimates across the array.
Implementation Method 1
each photoconductor is configured for exhibiting an electrical resistance dependent on an illumination of its light-sensitive region
Implementation Method 2
the bias voltage source is configured for applying at least one alternating bias voltage to the characterizing photoconductor or at least one direct current (DC) bias voltage to the characterizing photoconductor
Data Source
AI summary
A device includes at least one array of photoconductors, at least one bias voltage source, and at least one photoconductor readout circuit. Each photoconductor is configured for exhibiting an electrical resistance dependent on an illumination of its light-sensitive region, and at least one photoconductor of the array is designed as characterizing photoconductor. The bias voltage source is configured for applying at least one alternating bias voltage to the characterizing photoconductor or at least one direct current (DC) bias voltage to the characterizing photoconductor. The photoconductor readout circuit is configured for determining of a response voltage of the characterizing photoconductor generated in response to the bias voltage. The response voltage is proportional to a variable characterizing the array of photoconductors. The photoconductor readout circuit configured for determining of the response voltage of the characterizing photoconductor during operation of the array of photoconductors.