Divided-Aperture IR Camera for Real-Time Chemical Imaging
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Solution Overview
Problem
Existing spectral imaging systems require scanning in both spatial and spectral domains, leading to inefficient data acquisition and the need for cooled detectors, which are expensive and prone to motion artifacts, limiting their portability and real-time monitoring capabilities.
Innovation Solution
A divided-aperture infrared spectral imaging system that captures multispectral data simultaneously using uncooled detectors, allowing for real-time monitoring and reducing the need for cooling, with a compact design suitable for portable use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scanning approaches are used to acquire spectral data, then measurement precision is improved, but productivity deteriorates due to sequential data acquisition
Solution Approach 1:
The aperture is divided into multiple segments, each associated with a different spectral filter. This allows simultaneous capture of multiple spectral bands through parallel optical paths, transforming sequential scanning into concurrent measurement while maintaining spectral resolution
Solution Approach 2:
The system transitions from temporal scanning (one dimension) to spatial parallelism (adding a dimensional aspect). By arranging multiple optical channels side-by-side with different spectral filters, the system captures the full spectral data cube simultaneously across spatial and spectral dimensions
2Measurement precision
If cooled detectors are used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system replaces expensive, complex cooled detectors with inexpensive uncooled detectors. While individual uncooled detectors have lower sensitivity, the parallel array configuration compensates by capturing sufficient signal across multiple channels simultaneously
Solution Approach 2:
The mechanical cooling system is replaced with a passive thermal design. The divided aperture configuration allows each detector element to receive sufficient concentrated infrared energy to operate effectively at ambient temperature, eliminating the need for active cooling mechanisms
3Measurement precision
If cooled detectors are used, then measurement precision is improved, but reliability deteriorates due to motion artifacts
Solution Approach 1:
The system captures the complete spectral data cube in a single continuous snapshot rather than through sequential scanning. This eliminates temporal gaps between measurements, ensuring that all spectral information is recorded simultaneously before any motion can occur, thereby eliminating motion artifacts
Solution Approach 2:
By segmenting the aperture into multiple spectral channels that all capture data simultaneously, the system ensures continuous capture of all spectral information in parallel, removing the sequential timing that creates vulnerability to motion during scanning
4Ease of operation
If compact design is implemented, then ease of operation is improved through portability, but device complexity increases due to integration constraints
Solution Approach 1:
Multiple optical channels with different spectral filters are merged into a single camera housing. The divided aperture configuration allows all spectral channels to share common structural support and alignment references, enabling compact integration while maintaining optical performance
Solution Approach 2:
The system uses a single uncooled detector array that serves multiple spectral detection functions simultaneously. By making the detector universal across spectral bands and using a common housing for all optical components, the design achieves portability without proportionally increasing 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
Enables efficient, real-time detection and characterization of chemical compositions without the need for cooling, improving portability and reducing costs while minimizing motion artifacts.
Implementation Method 1
Each of the at least two optical channels can be positioned to transfer IR radiation incident on the optical system towards the optical FPA
Data Source
AI summary
In one embodiment, an infrared (IR) imaging system for determining a concentration of a target species in an object is disclosed. The imaging system can include an optical system including an optical focal plane array (FPA) unit. The optical system can have components defining at least two optical channels thereof, said at least two optical channels being spatially and spectrally different from one another. Each of the at least two optical channels can be positioned to transfer IR radiation incident on the optical system towards the optical FPA. The system can include a processing unit containing a processor that can be configured to acquire multispectral optical data representing said target species from the IR radiation received at the optical FPA. Said optical system and said processing unit can be contained together in a data acquisition and processing module configured to be worn or carried by a person.