Carbon Nanotube Array Black Body for Light Intensity Distribution
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Solution Overview
Problem
Existing systems for measuring light intensity distribution lack sensitivity and resolution when operated at room temperature, with thermal sensors being low-cost but insensitive, and photonic sensors being expensive and temperature-sensitive.
Innovation Solution
A system utilizing a carbon nanotube array, fabricated through chemical vapor deposition, which is free-standing and can be suspended in an inert environment, acts as an ideal black body to radiate light intensity, allowing for high sensitivity and resolution measurements at room temperature using an imaging element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal sensors are used for measuring light intensity distribution at room temperature, then the device can operate at room temperature with low cost, but the sensitivity and response speed are low
Solution Approach 1:
A black body cavity is introduced as an intermediary between the light source and the thermal sensor. The black body cavity absorbs incident light and converts it to thermal radiation, which then interacts with the thermal sensor. This mediator enables the thermal sensor to measure light intensity with high sensitivity by converting optical energy to thermal energy in a controlled manner, resolving the contradiction between room temperature operation and measurement precision.
2Measurement precision
If photonic sensors are used for measuring light intensity distribution, then high sensitivity and response speed are achieved, but the device cannot operate at room temperature and is expensive
Solution Approach 1:
The patent replaces photonic sensors (which require cryogenic temperatures) with a thermal sensor system that uses thermal radiation detection. The black body cavity converts incident light into thermal radiation patterns that can be detected by the thermal sensor, substituting a room-temperature-capable detection mechanism for one that requires extreme cold temperatures, thus achieving both high sensitivity and room temperature operation.
3Measurement precision
If a sensor is moved around a circumference to obtain multiple test data, then light intensity distribution can be measured, but the measurement process is time-consuming and complex
Solution Approach 1:
The patent transitions from one-dimensional sequential measurement (moving sensor along a circumference) to two-dimensional simultaneous measurement (fixed sensor array capturing multiple spatial positions at once). The black body cavity maintains a fixed geometric relationship with multiple sensors, allowing all sensors to capture light intensity data from different angles simultaneously, thus obtaining complete distribution information in a single measurement instance rather than requiring sequential movement over time.
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 accurate and sensitive measurement of light intensity distribution at room temperature with high resolution, simplifying the operation and improving measurement precision.
Implementation Method 1
The carbon nanotube array 10 acts as an ideal black body to radiate light intensity
Implementation Method 2
an imaging element 18... nearer to the bottom surface 104 of the carbon nanotube array 10 than the top surface 102
Data Source
AI summary
A system for measuring intensity distribution of light includes a carbon nanotube array and an imaging element. The carbon nanotube array is placed in an environment of inert gas or a vacuum environment. The carbon nanotube array absorbs photons of a light source and radiates radiation light. The imaging element is used to image the radiation light. The carbon nanotube array is between the light source and the imaging element.