Optoelectronic Sensor Flicker Detection via Interval Signal Storage
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Solution Overview
Problem
Existing optoelectronic sensor devices struggle to efficiently detect flicker frequencies in light sources, leading to image distortions and 'banding' effects in CMOS-based cameras, particularly when the image recording frequency is not synchronized with the flicker frequency.
Innovation Solution
A compact and inexpensive optoelectronic sensor device that includes an optoelectronic detection device with a detector area for light detection, generating an electrical signal based on detected light. The sensor device features a signal recording device that saves signal values during time intervals and outputs a display signal upon interval expiration, allowing for synchronization of image recording frequency with detected flicker frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing optoelectronic sensor devices are used to detect flicker frequencies, then flicker detection capability is provided, but the devices are complex and expensive
Solution Approach 1:
The patent extracts only the essential function needed for flicker detection - storing signal values during time intervals and outputting a display signal - while removing unnecessary complex components found in existing sensors like the VD6281, TCS3707, and TMD 49103S. This extraction approach maintains flicker detection capability while significantly simplifying the device structure and reducing costs.
Solution Approach 2:
The simplified sensor device can detect various flicker frequencies (including non-standard frequencies like 100Hz, 120Hz, 200Hz) through a universal time interval storage mechanism, making it adaptable to different lighting conditions and power grid frequencies without requiring multiple specialized detectors.
2Measurement precision
If existing optoelectronic sensor devices are used to detect flicker frequencies, then flicker detection capability is provided, but the devices are expensive
Solution Approach 1:
The patent employs a simple memory structure that stores signal values only for defined time intervals rather than continuous buffering, allowing for a more economical design that uses less expensive memory components while maintaining adequate flicker detection performance for the intended application duration.
3Productivity
If image recording frequency is not synchronized with flicker frequency, then continuous image capture is possible, but banding effects occur in images
Solution Approach 1:
The sensor provides feedback about the detected flicker frequency through the display signal, enabling the camera system to adjust its image capture timing or frequency to synchronize with the flicker pattern, thereby eliminating banding effects while maintaining continuous capture capability.
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
The proposed sensor device effectively detects flicker frequencies, enabling synchronization of image recording frequencies and thereby reducing or eliminating 'banding' effects in images captured by CMOS-based cameras.
Implementation Method 1
an optoelectronic detection device (15) having a detector surface for detecting light and for providing an electrical signal as a function of the detected light
Data Source
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AI summary
The invention relates to an optoelectronic sensor apparatus comprising: an optoelectronic detection device (15) which is designed to detect light and which provides an electrical signal in accordance with the detected light; and a signal detection device (21) which is designed to store at least one signal value of the electrical signal in a memory (19) during a time interval of repeating time intervals (T) and to output a display signal (315) after the time interval (T) has elapsed.