Deployable Micro-Spectrometer Bullets Using Fresnel Diffraction
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Solution Overview
Problem
Conventional spectrometers are too bulky and heavy for analyzing small samples in inaccessible locations, such as lunar or Martian surfaces, due to their reliance on Fraunhofer diffraction principles, which require high line-density gratings and long path lengths, making miniaturization difficult without sacrificing spectral resolution.
Innovation Solution
A bullet-shaped micro-spectrometer utilizing the Fresnel diffraction principle, integrated with a super capacitor, LED or laser diode, ADC circuit, and telemetry system, capable of generating deep UV light to excite materials and transmitting spectral signatures wirelessly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Fraunhofer diffraction principles are used with high line-density gratings and long path lengths to increase spectral resolution, then spectral resolution is improved, but device size and weight increase making miniaturization difficult
Solution Approach 1:
The patent changes the fundamental diffraction parameter from Fraunhofer to Fresnel diffraction, enabling miniaturization while maintaining spectral resolution. By using Fresnel diffraction with a curved grating surface, the system achieves nanometer-scale spectral resolution in a bullet-shaped device only 3cm long, eliminating the need for long path lengths required by Fraunhofer diffraction
Solution Approach 2:
The patent employs a curved grating surface in the Fresnel diffraction configuration, where the grating lines are arranged on a spherical or cylindrical surface rather than a flat plane. This curvature enables compact folding of the optical path and achieves high spectral resolution in a miniaturized form factor suitable for portable deployment
2Measurement precision
If conventional spectrometers are designed with high line-density gratings and long path lengths, then spectral resolution is improved, but device complexity and cost increase
Solution Approach 1:
The patent fundamentally changes the diffraction regime from Fraunhofer to Fresnel, allowing the use of lower line-density gratings on curved surfaces instead of high line-density flat gratings. This parameter change simplifies the optical system while achieving the same spectral resolution, reducing both complexity and manufacturing cost
Solution Approach 2:
The patent integrates multiple optical functions into a nested compact structure where the curved grating serves both as the diffraction element and the spectral dispersion mechanism. The bullet-shaped housing contains all optical components in a nested arrangement, eliminating the need for separate adjustment mechanisms and reducing overall system complexity
3Volume of moving object
If miniaturized spectrometers are created without sufficient path length, then device size is reduced, but spectral resolution is compromised
Solution Approach 1:
The patent uses a curved grating surface in Fresnel diffraction configuration that effectively folds the optical path length within a compact volume. The curvature radius and grating line density are optimized to achieve nanometer-scale spectral resolution despite the short physical path length in the miniaturized bullet-shaped device
Solution Approach 2:
The patent transitions from the traditional planar Fraunhofer diffraction geometry to a three-dimensional Fresnel diffraction configuration with curved surfaces. This dimensional change allows the optical path to be folded back on itself, achieving long effective path length for high spectral resolution within a short physical device length
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 miniaturized, portable, and inexpensive spectral analysis of small samples with nanometer resolving power, allowing deployment in remote or inaccessible areas without compromising spectral resolution.
Implementation Method 1
An LED or laser diode runs in a burst mode to generate deep or vacuum UV to excite target material
Implementation Method 2
When the excited state of target material undergoes a singlet or triplet transition, this transition process yields fluorescence or luminescence which is a material-dependent
Implementation Method 3
When the excited state of target material undergoes a singlet or triplet transition, this transition process yields fluorescence or luminescence which is a material-dependent
Implementation Method 4
The device is based on the micro-spectrometer that uses the Fresnel diffraction principle that allows a tiny implementation with a nanometer resolving power of spectral signal
Data Source
AI summary
A tiny and portable micro-spectrometer deployable in a bullet-like form that is inexpensive to the point that it can even be disposable is described. The device is based on the micro-spectrometer that uses the Fresnel diffraction principle that allows a tiny implementation with a nanometer resolving power of spectral signal. A bullet-like micro-spectrometer has an integration of a super capacitor as a power source, a charging coil for the super capacitor, an LED or laser diode light source and driver, an analog to digital converter (ADC) circuit, and a telemetry system with antenna string. An LED or laser diode runs in a burst mode to generate deep or vacuum UV to excite target material. When the excited state of target material undergoes a singlet or triplet transition, this transition process yields fluorescence or luminescence which is a material-dependent. The micro-spectrometer senses and uses this spectral emission from material to identify the spectral signature of the targeted material. The data is converted by an ADC and transmitted to a receiving station.