Lensless Optical Detection With LED Failure Compensation
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Solution Overview
Problem
Existing lens-less imaging systems for detecting microorganisms face issues with abnormal detection values due to LED failures, leading to non-uniform luminance distribution in the detection area.
Innovation Solution
A detection device with a configuration of multiple LEDs facing a detection area, controlled by a control circuit to adjust current set values of sensor pixels, ensuring normal LEDs maintain detection values within a target range even when some LEDs fail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LEDs are arranged to face the detection area to maintain uniform luminance distribution, then the uniformity of illumination is improved, but the system reliability deteriorates because LED failures cause abnormal detection values in adjacent sensor pixels
Solution Approach 1:
The patent divides the detection area into multiple regions, each associated with a specific LED. When an LED fails, only the sensor pixels in its associated region are affected, while other regions continue to function normally. This segmentation limits the impact scope of LED failures and maintains overall system reliability.
Solution Approach 2:
The control circuit dynamically adjusts the current set values of LEDs based on real-time detection values from sensor pixels. When an LED is detected to have failed, the control circuit modifies the operating parameters (current values) of other LEDs to compensate and maintain uniform illumination across the detection area, ensuring continuous accurate detection.
2Measurement precision
If the amount of light from light-emitting elements is adjusted to maintain detection values within a predetermined range, then the measurement precision is improved, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The control circuit continuously monitors detection values from sensor pixels and uses this feedback to automatically adjust the current set values of LEDs. This closed-loop feedback mechanism maintains detection values within the target range without requiring complex manual intervention or overly sophisticated control algorithms, achieving precise measurement with manageable system complexity.
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 solution effectively reduces abnormal detection values by uniformly setting current values, maintaining consistent detection accuracy despite LED failures.
Implementation Method 1
a light source in which a plurality of light-emitting diodes are arranged in a plane parallel to the detection area
Implementation Method 2
an optical sensor having a detection area in which a plurality of sensor pixels are arranged in a planar configuration
Data Source
AI summary
According to an aspect, a detection device includes: an optical sensor having a detection area in which sensor pixels are arranged; a light source in which light-emitting diodes are arranged; and a control circuit configured to control the optical sensor and the light source, acquire detection values of the sensor pixels, and generate an image of an object to be detected placed in the detection area. Each sensor pixel is associated with a nearest light-emitting diode of the light-emitting diodes. The control circuit is configured to acquire detection values of the sensor pixels when the object to be detected is not placed in the detection area, and uniformly set current set values of the light-emitting diodes so that an average value of the detection values of the sensor pixels associated with the light-emitting diodes that are not failed falls within a target range.