Brightness Tracking Light Sensor Photodiode Circuit
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Solution Overview
Problem
Existing optical devices that combine images from multiple cameras lack an effective method to measure scene brightness directly and control the brightness of one imager based on the measurement, especially when there is no built-in proportional electrical output, such as a screen current monitor.
Innovation Solution
An optical device comprising a first imager, a second imager, a beam splitter, and a photodiode circuit that measures the brightness of the first imager's output and adjusts the intensity of the second imager, using a photodiode circuit to capture brightness levels and control the output signal, with optional components like a condenser lens and band pass filter to enhance measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a built-in proportional electrical output (such as a screen current monitor) is used to measure brightness, then brightness measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the brightness measurement function from the imager itself by using a separate photodiode circuit to measure the light output. This separates the measurement function from the imaging function, avoiding the need for built-in electrical output monitoring while achieving accurate brightness measurement through optical detection alone
Solution Approach 2:
The patent introduces a photodiode circuit as an intermediary device that optically measures the light output from the imager. This intermediary converts optical energy to electrical signals for brightness measurement, providing an alternative to direct electrical output monitoring and simplifying the overall system architecture
2Ease of operation
If brightness tracking is implemented to balance image intensity, then viewer comfort is improved, but device complexity increases
Solution Approach 1:
The patent implements brightness tracking by using the photodiode circuit to continuously monitor the light output and providing feedback signals to control the display brightness. This automatic feedback mechanism balances the intensity between the image intensifier tube and display, ensuring viewer comfort while maintaining relatively simple system architecture through direct optical-electrical coupling
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 direct measurement and control of image brightness, preventing overwhelming of the viewer's eye by ensuring balanced image intensity, suitable for low-light or night vision applications, and compatible with various imaging sources like image intensifier tubes and thermal cameras.
Implementation Method 1
A photodiode circuit is positioned adjacent the beam splitter for measuring brightness levels of the first output image
Implementation Method 2
A beam splitter is positioned to receive the first and second images and transmit the first and second images to the viewer
Data Source
AI summary
A brightness tracking system for an optical device includes a first imager for viewing a target of interest, a second imager for viewing the same target of interest, and a photodiode circuit. The photodiode circuit (a) measures brightness levels of the target of interest received from the first imager, and (b) controls output brightness of the second imager, based on the measured brightness levels received from the first imager.