Snow Density Measurement via Near-Infrared Imaging
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Solution Overview
Problem
Current methods for measuring snow density, such as gravimetry and dielectric property measurements, suffer from limited spatial resolution and require invasive sample extraction, while optical methods are cumbersome and lack in-situ, high-resolution capabilities, hindering accurate field monitoring of snow cover variability in climate-sensitive regions.
Innovation Solution
A non-invasive, box-shaped snow density measurement instrument using near-infrared imaging with a coverplate featuring slits or apertures to capture reflectance changes, allowing for continuous, high-resolution density mapping with improved spatial coverage and reduced preparatory work, enabling simultaneous measurement of snow density and specific surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gravimetry is used to measure snow density, then measurement precision is improved, but spatial resolution deteriorates and sample extraction is required
Solution Approach 1:
The patent replaces the mechanical gravimetric measurement system with an optical imaging system. Instead of physically extracting and weighing snow samples, the system uses near-infrared cameras to capture images of snow through apertures, converting a mechanical measurement process into an optical one that enables non-contact, high-resolution spatial mapping of density without sample extraction.
Solution Approach 2:
The patent creates optical copies (images) of the snow structure through near-infrared transmission imaging. By capturing images of snow samples through controlled apertures and reconstructing density information from these optical copies, the system achieves both precision and high spatial resolution without needing to physically handle or extract the actual snow samples.
2Manufacturing precision
If optical transmittance measurement is used, then spatial resolution is improved, but preparation work complexity increases
Solution Approach 1:
The patent performs preliminary action by pre-configuring the instrument with a standardized box structure and aperture plate system. The aperture plate with predetermined opening patterns is prepared in advance, allowing the field measurements to proceed directly by simply placing the box over the snow and capturing images, eliminating complex field preparation while maintaining high spatial resolution.
Solution Approach 2:
The patent changes the measurement parameter from visible light to near-infrared wavelength. This parameter change allows the system to penetrate snow more effectively and reduces sensitivity to surface irregularities, thereby maintaining high spatial resolution while simplifying field preparation requirements as the near-infrared imaging is less affected by snow surface conditions.
3Adaptability or versatility
If dielectric property measurement is used, then measurement capability is improved, but snow compacting occurs and spatial resolution is limited
Solution Approach 1:
The patent replaces dielectric property measurement with optical transmission imaging. Instead of inserting physical antennas that compact the snow, the system uses non-contact near-infrared imaging to measure density. This substitution eliminates the mechanical intrusion that causes snow compacting while maintaining versatile measurement capability through the optical approach.
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 instrument achieves a vertical resolution of better than 10 mm and 5-10-fold improved spatial resolution compared to gravimetry, providing immediate quantification of spatial variability without observer bias, suitable for fragile snow types and detecting stratigraphic features, while being cost-effective and user-friendly for field use.
Implementation Method 1
at least one illumination device (4), in particular at least one near-infrared light source
Implementation Method 2
The reflected radiation over the slit (5), respectively over more general an aperture (5), is measured with the at least one optical detector (8)
Data Source
Figure 1~2
Figure 3a~3b
AI summary
The disclosed invention shows a snow density measurement instrument (B), comprising at least one illumination device (4), at least one light detector (8) and a controlling computational unit (CU), wherein the at least one illumination device (4) and the at least one light detector (8) are arranged in the interior of the snow density measurement instrument (B), which is coverable with an instrument coverplate (3) facing a snow side (S), with improved resolution and easy to use by avoiding tedious preparation work before measurements. This is reached through at least one aperture (5) in the instrument coverplate (3), allowing passage of incident near-infrared radiation (6) in a wavelength range between 800nm and 1000nm through the at least one aperture (5) to the snow side (S), while from ice particles (1) reflected radiation can be measured in the at least one light detector (8) with digital images controlled and processed by the controlling computational unit (CU) in the interior of the snow density measurement instrument (B) in a non-invasively way.