Field Spectral Radiometer Calibration Assembly
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Solution Overview
Problem
Existing remote sensing systems lack accurate calibration methods that account for varying solar, atmospheric, and topographical conditions, leading to inaccurate radiometric data collection due to reliance on factory calibrations that are not adaptable to real-time environmental factors.
Innovation Solution
A field spectral radiometer with a support structure and remote sensing head, featuring multiple optical channels and a calibration assembly, allows for real-time calibration by measuring solar radiance, atmospheric transmission, and surface reflectance, using a deployment arm and rotating support for adjustable viewing angles, and a calibration light source for precise instrument calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If factory calibrations are used to measure radiance, then the instrument can operate without frequent calibration, but the calibration accuracy deteriorates under varying solar, atmospheric, and topographical conditions
Solution Approach 1:
The system changes the calibration approach from fixed factory calibration to dynamic field calibration by measuring actual environmental parameters (solar irradiance, atmospheric conditions, surface reflectance) and using these to adjust calibration factors in real-time, resolving the contradiction between calibration stability and measurement accuracy under varying conditions
Solution Approach 2:
The system implements feedback by continuously measuring environmental parameters (solar radiance, atmospheric transmission, surface reflectance) and using these measurements to adjust calibration factors, creating a closed-loop system that maintains accuracy despite changing conditions
2Adaptability or versatility
If multiple optical channels with different wavelength ranges are used, then the spectral coverage is improved, but the device complexity increases
Solution Approach 1:
The system segments the spectral measurement task into multiple optical channels, each handling a specific wavelength range with dedicated optical elements and detection paths, allowing comprehensive spectral coverage while managing complexity through functional decomposition
Solution Approach 2:
The system uses a universal calibration approach where the calibration assembly and calibration light source serve all multiple optical channels simultaneously, providing a common calibration framework that reduces overall system complexity despite the presence of multiple wavelength-specific components
3Adaptability or versatility
If the remote sensing head is made adjustable for pan and tilt, then the viewing flexibility is improved, but the device complexity increases
Solution Approach 1:
The system transitions from a fixed remote sensing head to a dynamic mounting system with adjustable pan and tilt capabilities, allowing the viewing direction to be changed as needed while maintaining a relatively simple mechanical structure through the use of standard rotation and pivot mechanisms
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 accurate and flexible calibration of imaging systems across different wavelength ranges, ensuring high dynamic range and signal-to-noise ratio, thereby improving the reliability of radiometric data collection in diverse environmental conditions.
Implementation Method 1
a calibrating light source comprising an opening
Implementation Method 2
a first optical element disposed on a first side of the central axis and defining a first optical path for a first optical channel, and a second optical element disposed on a second side of the central axis, the second optical element defining second optical path for a second optical channel
Implementation Method 3
The first detection path includes a first optical indexer to filter light reflected by the first optical element. The second detection path includes a second optical indexer to filter light reflected by the second optical element
Implementation Method 4
The first detection path includes a first optical indexer to filter light reflected by the first optical element. The second detection path includes a second optical indexer to filter light reflected by the second optical element
Data Source
AI summary
A field spectral radiometer includes a support structure and a remote sensing head disposed on the support structure. The remote sensing head includes a central axis, a first optical element disposed on a first side of the central axis and defining a first optical path for a first optical channel, and a second optical element disposed on a second side of the central axis and defining second optical path for a second optical channel. An instrumentation assembly disposed on the support structure. the instrumentation assembly includes a first detection path associated with the first optical channel and a second detection path associated with the second optical channel, the first and second detection path include optical indexers for manipulating the first and second optical channels. The field spectral radiometer may include a calibration assembly disposed on the base. The calibration assembly may include a calibrating light source for calibrating the remote sensing head.