Acoustic Internal Temperature Measurement Device
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Solution Overview
Problem
Existing thermometers face challenges in accurately measuring core body temperature due to variations in thermal resistance within the subject, leading to inaccuracies in temperature calculation.
Innovation Solution
An internal temperature measurement device that uses a sound wave sensor to transmit and receive sound waves, calculating sound velocity to determine internal temperature, thereby bypassing the need for thermal resistance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a heating type thermometer is used to measure core body temperature, then the measurement can be performed continuously over a long period, but the thermometer consumes a large amount of power
Solution Approach 1:
The patent replaces the heating-based thermal measurement system with an acoustic wave-based measurement system. Instead of using a heater to create thermal conditions for measurement, the invention uses sound wave transmission and reception to measure internal temperature, thereby eliminating the high power consumption associated with continuous heating while enabling continuous measurement.
Solution Approach 2:
The patent changes the measurement parameter from thermal resistance (which requires heating) to sound velocity. By measuring the velocity of sound waves traveling through body tissue, the system can determine internal temperature without requiring continuous heating, thus reducing power consumption while maintaining continuous measurement capability.
2Use of energy by moving object
If a non-heating type thermometer with heat flow detection structures is used, then power consumption is reduced, but thermal resistance variations in the subject interior cause deterioration in measurement accuracy
Solution Approach 1:
The patent replaces the heat flow detection system with an acoustic wave system. Instead of measuring heat flow through thermal resistance (which varies with tissue conditions), the invention measures sound wave velocity, which provides a more stable and accurate indicator of internal temperature that is less affected by tissue variations.
Solution Approach 2:
The patent changes the measurement parameter from thermal resistance to sound velocity. Sound velocity in body tissue has a more direct and stable relationship with temperature compared to thermal resistance, which varies with tissue composition, sweat, and blood flow. This parameter change improves measurement accuracy while maintaining low power consumption.
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
This method improves the accuracy of internal temperature measurement by estimating core body temperature based on sound velocity, reducing reliance on thermal resistance variations.
Implementation Method 1
a sound velocity calculation unit configured to calculate a sound velocity in the subject on the basis of the elapsed time measured by the time measurement unit
Data Source
AI summary
An internal temperature measurement device includes a sound wave sensor that transmits a sound wave to a subject and receives a reflected sound wave reflected by the subject, a time measurement device that measures an elapsed time elapsed between transmission of the sound wave from the sound wave sensor and reception of the reflected sound wave, a sound velocity calculator that calculates a sound velocity in the subject according to the elapsed time measured by the time measurement device, and an internal temperature derivation device that determines an internal temperature of the subject according to the sound velocity calculated by the sound velocity calculator.