Diving Watch Surfacing Speed Warning via Dual-Interval Depth Analysis
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Solution Overview
Problem
Existing underwater diving watches face measurement errors due to arm movements during surfacing, leading to inaccurate surfacing speed calculations and potential violations of safe decompression speeds.
Innovation Solution
A diving watch equipped with a sensor and processor that calculates water depth and surfacing amount at predetermined intervals, issuing warnings based on both long-term and short-term surfacing speed conditions to reduce arm movement influence, using a combination of moving average and recent minimum surfacing speed determinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement time period is prolonged to reduce measurement error due to arm movements, then measurement precision is improved, but the determination is delayed
Solution Approach 1:
The patent divides the surfacing speed determination into two separate evaluation systems: a long-term evaluation based on moving average of surfacing amounts over an extended period, and a short-term evaluation based on recent surfacing amounts. This segmentation allows the system to simultaneously achieve measurement precision through the long-term average while maintaining timely determination through the short-term evaluation, resolving the contradiction between precision and speed.
2Productivity
If the surfacing speed determination is based on recent surfacing amounts only, then the determination responsiveness is improved, but measurement precision is reduced due to arm movement errors
Solution Approach 1:
The patent implements dual evaluation paths: one evaluating recent surfacing amounts for responsive detection of actual excessive surfacing, and another evaluating long-term moving average to filter out arm movement errors. Both evaluations operate independently and can trigger warnings, ensuring neither responsiveness nor precision is compromised.
Solution Approach 2:
The system continuously monitors surfacing amounts and provides feedback through two parallel determination mechanisms. The long-term moving average provides feedback on overall surfacing trends, while the recent surfacing amount evaluation provides feedback on immediate surfacing conditions. This dual feedback system ensures both responsiveness and precision in surfacing speed determination.
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 solution provides precise surfacing speed violation warnings, reducing measurement errors and enabling timely alerts, thus ensuring safer diving practices by accounting for both short-term and long-term surfacing speed deviations.
Implementation Method 1
a water depth is detected by an embedded pressure sensor
Data Source
AI summary
A warning notification device includes a sensor, a notification unit, and a processor. The processor is configured to calculate a water depth from an output of the sensor every predetermined time and to calculate a surfacing amount from a change in the calculated water depth every predetermined time. When a long-term surfacing speed condition, which is to be determined on the basis of the surfacing amounts of a first number, is satisfied or when a short-term surfacing speed condition, which is to be determined on the basis of the recent surfacing amounts of a second number smaller than the first number, is satisfied, the processor enables the notification unit to issue a warning of a surfacing operation.