Optical Reading System with Periodic LED Illumination
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Solution Overview
Problem
Optical sensors face limitations in cost-effectiveness and power consumption, particularly in outdoor or varying light conditions, and require efficient image analysis with minimal computation and energy use.
Innovation Solution
An optical reading system with a CMOS sensor, LED, and optical filter that captures images and determines object presence by comparing image values to thresholds, using a low-power microprocessor and control circuitry to minimize power consumption and ambient light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If low cost optical sensors are used, then cost is reduced, but reliability in varying light conditions deteriorates
Solution Approach 1:
The system employs periodic illumination using an LED that is activated only during image capture intervals, rather than continuous illumination. This periodic action allows the low-cost sensor to operate reliably by controlling when light is introduced, thereby managing the impact of varying ambient light conditions while maintaining cost-effectiveness
Solution Approach 2:
An LED serves as an intermediary light source that mediates between the sensor and ambient light conditions. By introducing controlled illumination through this intermediary, the system compensates for varying ambient light conditions, enabling reliable operation of low-cost sensors in environments where ambient light varies
2Productivity
If fast processors are used for image analysis, then productivity is improved, but power consumption increases
Solution Approach 1:
The system extracts and processes only the essential features from captured images rather than performing complete image analysis. By taking out only the critical information needed for the specific application, the system achieves adequate productivity with minimal computational requirements, thereby reducing power consumption while still fulfilling the core function
Solution Approach 2:
The system performs partial image analysis, focusing only on the specific features or parameters needed for the application rather than complete analysis. This partial action approach provides sufficient productivity for the intended purpose while significantly reducing the computational load and associated power consumption
3Measurement precision
If optical sensors are positioned close to the surface, then measurement precision is improved, but adaptability to different locations deteriorates
Solution Approach 1:
The system is designed with multi-functionality, combining the optical sensor with an integrated LED illumination source and control circuitry that can adapt to different mounting locations. This universal design allows the sensor to maintain measurement precision whether mounted close to or at a distance from the surface, as the LED can compensate for varying distances by adjusting illumination intensity
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 system enables reliable, accurate, and cost-effective optical sensing with reduced power consumption, allowing for efficient image analysis and extended battery life, suitable for various applications including outdoor use.
Implementation Method 1
The sensors use light sensitive circuitry, commonly referred to as a pixel, to convert light energy into electrical energy. Each pixel typically includes a photodiode formed in a silicon substrate. As the photodiode is exposed to light, an electrical charge is induced.
Implementation Method 2
An optical reading system having a sensor capable of acquiring images in an area of interest... An optical reading system is provided having an optical sensor. A lens is adjacent the optical sensor and arranged to focus the optical sensor on an area of interest.
Data Source
AI summary
An optical sensor for detecting motion or movement in an area of interest and a method of operation is provided. The system includes a CMOS sensor having an array of pixels that captures images in an area of interest. The system monitors the average pixel value for the array to define a first state. If the average pixel value changes beyond a defined threshold, the system defines a second state. For each change in state, a signal is generated. In one embodiment, the optical sensor is used with a meter having a dial with an indicator. The optical sensor generates a signal each time the indicator passes through the area of interest to allow for the remote monitoring of a consumable commodity.