Floating Optical Observation Device for Water-Leaving Radiance Measurement
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Solution Overview
Problem
Existing methods for measuring water-leaving radiance in ocean optics are inaccurate due to uncertainties in derivation processes, particularly when the sea surface is roughened by waves or in highly turbid or vertically stratified waters, leading to significant errors in remote sensing reflectivity.
Innovation Solution
A floating optical observation device with a vertical optical probe mounting frame and a water-tight cavity, equipped with radiance and irradiance probes, allows for direct measurement of water-leaving radiance, reducing method defects and personal errors, and features modular design for ease of deployment and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the over-the-surface measurement method is used, then the measurement can be implemented at the measurement site, but the accuracy of water-leaving radiance determination deteriorates due to surface reflection uncertainties when the sea surface is roughened by waves
Solution Approach 1:
The patent extracts the radiance probe from the water surface environment and places it underwater at a specific depth (10-50cm below the surface). This extraction removes the harmful surface reflection factor from the measurement path while maintaining the ability to measure the upward radiance that contains the water-leaving radiance information.
Solution Approach 2:
The patent introduces an intermediary measurement approach by measuring the upward radiance at a depth below the surface and then deriving the water-leving radiance through calculation. This intermediary method avoids direct measurement at the surface where reflections occur, while still obtaining the desired water-leaving radiance information through the relationship between upward radiance and water-leaving radiance.
2Ease of operation
If the underwater profile measurement method is used, then the measurement can be implemented at the measurement site, but the accuracy of water-leaving radiance determination deteriorates due to difficulties in accurately estimating the attenuation coefficient in highly turbid or vertically stratified waters
Solution Approach 1:
The patent extracts the radiance measurement from the complex underwater profile measurement process by placing a radiance probe at a specific depth (10-50cm below the surface). This simplifies the measurement approach and eliminates the need for complex attenuation coefficient estimation in turbid or stratified waters.
Solution Approach 2:
The patent changes the measurement parameter from requiring attenuation coefficient estimation to directly measuring upward radiance at a specific depth. This parameter change simplifies the measurement process and improves accuracy in challenging water conditions by avoiding the uncertain attenuation coefficient estimation.
3Ease of operation
If the surface floating measurement method is used, then the measurement can be implemented at the measurement site, but the accuracy of water-leving radiance determination deteriorates due to the need to derive upward radiance at 10-50 cm below the water surface and assume refractive index and cross-sectional reflectivity
Solution Approach 1:
The patent applies self-service by having the floating device itself provide the measurement function. The radiance probe mounted on the floating device directly measures the upward radiance at the required depth (10-50cm below surface), eliminating the need for separate derivation processes and assumptions about refractive index and reflectivity.
4Ease of operation
If any of the three measurement methods is used, then the measurement can be implemented at the measurement site, but the accuracy of water-leaving radiance measurement deteriorates due to various uncertain factors in the derivation process
Solution Approach 1:
The patent replaces the complex mechanical/derivational measurement systems with a direct optical measurement approach. By using a radiance probe to directly measure upward radiance underwater and combining it with an irradiance probe measurement, the system eliminates the need for complex derivation processes and reduces uncertain factors.
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 device achieves precise measurement of water-leaving radiance, significantly improving the accuracy of remote sensing reflectivity by minimizing interference from surface reflections and allowing for adjustable probe heights and modular components for various environments.
Implementation Method 1
The floating body ring is provided with a water-tight cavity which provides flotage for the whole floating device
Implementation Method 2
An optical probe is mounted on the optical probe mounting frame in a vertical direction... equipped with radiance and irradiance probes, allows for direct measurement of water-leaving radiance
Data Source
AI summary
A system for in-situ measurement of an apparent spectrum of a water body includes a floating device, and an optical sensing and conduction device, an electronic measurement device, a control circuit, and a power supply device which are loaded on the floating device. The floating device includes a floating body ring and an optical probe mounting frame on the floating body ring in a direction perpendicular to a ring surface. The optical probe mounting frame includes a vertical mounting assembly and a horizontal connecting assembly. The horizontal connecting assembly is provided radially along the ring shape of the floating body ring. One end of the horizontal connecting assembly is connected to the vertical mounting assembly and the other end thereof is connected to the floating body ring.