Micro Mirror Arrays for Infrared Detection via Thermal Rotation
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Solution Overview
Problem
Current thermal imaging technologies for infrared radiation detection are inadequate for low-cost, high-volume applications due to production complexity and expense, necessitating the development of ubiquitous, cost-effective infrared imagers with limited spatial resolution.
Innovation Solution
A radiation imaging apparatus comprising an array of micro mirrors that rotate in response to absorbed radiation, reflecting light to create distinct light spots on an imaging surface, captured by a photodetector, which processes the image to determine radiation intensity, with a processor and communication interface for data transmission, and includes specific micro mirror structures to correct for environmental influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal imaging technologies are used for infrared radiation detection, then detection capability is achieved, but production complexity and cost increase
Solution Approach 1:
The device segments the detection function into two independent parts: (1) micro mirrors that absorb infrared radiation and rotate in response to temperature changes, and (2) a separate optical detection system that captures reflected light. This segmentation allows each component to be optimized independently, reducing overall production complexity while maintaining detection capability.
Solution Approach 2:
The patent introduces an intermediary mechanism (the micro mirrors) that converts infrared radiation detection into mechanical rotation, which is then translated into optical signal variations. This intermediary approach enables the use of simpler, lower-cost optical components instead of requiring complex thermal imaging detectors.
2Reliability
If thermal imaging technologies are used for infrared radiation detection, then detection capability is achieved, but cost increases
Solution Approach 1:
The micro mirrors are designed as simple, inexpensive components that can be manufactured in large quantities using low-cost materials and processes. The patent specifically mentions using materials with different thermal expansion coefficients that can be easily fabricated, replacing expensive thermal imaging detector arrays.
Solution Approach 2:
The patent changes the detection parameter from direct thermal measurement (requiring expensive thermal sensors) to optical reflection measurement (using inexpensive light detectors). By converting the physical quantity being measured from temperature to light intensity, the system achieves the same detection capability at lower cost.
3Measurement precision
If micro mirrors rotate in response to absorbed radiation, then radiation intensity measurement is achieved, but environmental influences may affect accuracy
Solution Approach 1:
The patent incorporates reference micro mirrors that are identical to the measurement micro mirrors but are not exposed to infrared radiation. These reference mirrors experience the same environmental conditions (temperature changes, mechanical stresses) and provide a baseline for comparison. The system uses feedback from the reference mirrors to compensate for environmental influences on the measurement mirrors, maintaining measurement precision.
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 provides accurate and cost-effective detection of infrared radiation, enabling applications such as non-visual environment monitoring and human presence detection with minimal false alarms, while minimizing production complexity and cost.
Implementation Method 1
Each of the cantilevers is configured to absorb electromagnetic radiation to generate heat
Implementation Method 2
The cantilevers are configured to absorb electromagnetic radiation to generate heat and thus bend under the heat proportionately
Implementation Method 3
the micro mirrors rotate according to radiation absorbed in the micro mirrors and reflect light from the light source to generate a distribution of reflected light on the imaging surface
Data Source
AI summary
A radiation imaging apparatus includes an imaging surface; a light source; and an array of micro mirrors that rotate via radiation absorbed in the micro mirrors and reflect light from the light source to generate a distribution of reflected light on the imaging surface. The array first micro mirrors and second micro mirrors. The first micro mirrors have a first structure and the second micro mirrors have a second structure different than the first structure. The second structure is configured to correct for one or more environmental influences on the radiation imaging apparatus. A photodetector captures an image of the distribution of reflected light on the imaging surface. A processor is coupled to the photodetector. A communication interface is coupled with the processor; and a computing device is located separately from the radiation imaging apparatus and in communication with the communication interface.