Head-Mounted Device Salinity Sensor Heat Stroke Prevention
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Solution Overview
Problem
Existing head-mounted devices for heat stroke prevention in construction workers are limited in accurately measuring physical conditions necessary for estimating the possibility of heat stroke, such as water and salt loss, due to their reliance on temperature and humidity sensors alone.
Innovation Solution
A head-mounted device equipped with a fan, salinity sensor, first and second humidity sensors, body temperature sensor, heartbeat sensor, and airflow measurement device, which calculates the amount of sweating and salt loss based on sensor data and issues alarms when predetermined conditions are met, to provide more accurate monitoring and prevention of heat stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature and humidity sensors are used to monitor heat stroke risk, then the device structure is simple, but the measurement precision of physical conditions (water and salt loss) is insufficient
Solution Approach 1:
The monitoring function is segmented into multiple specialized sensors: temperature sensor for thermal conditions, humidity sensor for sweat moisture, and salinity sensor for salt concentration. Each sensor targets a specific physical parameter, enabling precise measurement of water and salt loss separately rather than using a single general-purpose sensor.
Solution Approach 2:
The head-mounted device integrates multiple sensing functions (temperature monitoring, humidity detection, salinity measurement) into a single wearable unit. The control unit processes data from all sensors to comprehensively assess heat stroke risk, making the device multi-functional while maintaining wearability.
2Measurement precision
If multiple sensors are added to improve measurement accuracy, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
Multiple sensors (temperature, humidity, salinity) and the control unit are integrated into a single head-mounted device structure. The sensors are spatially arranged on the helmet surface, and their data streams are merged in the control unit for unified processing, reducing the complexity that would arise from separate monitoring systems.
Solution Approach 2:
The device automatically measures and processes multiple physical parameters simultaneously without requiring external intervention. The control unit autonomously collects data from all sensors, calculates water and salt loss, and generates heat stroke risk assessments, eliminating the need for manual measurement or complex external processing equipment.
3Measurement precision
If salt concentration measurement is added to sweat analysis, then the accuracy of salt loss estimation improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The sweat analysis function is segmented into two independent measurement components: humidity sensing for water loss and salinity sensing for salt loss. The salinity sensor is positioned to contact sweat separately from the humidity sensor, allowing specialized measurement of ionic concentration without interfering with moisture detection, thereby improving salt loss estimation accuracy.
Solution Approach 2:
The head-mounted device serves multiple monitoring functions simultaneously: thermal monitoring via temperature sensor, moisture monitoring via humidity sensor, and salt concentration monitoring via salinity sensor. This multi-functionality is achieved within a single wearable unit, maintaining ease of manufacture by integrating all functions into one device rather than requiring separate systems.
Data Source
AI summary
A head-mounted device capable of more highly accurately measuring the physical conditions of a wearer as a worker that are necessary for estimating the possibility of heat stroke is provided. A head-mounted device includes an outer shell; a first channel as a gap between a head of a wearer and the outer shell; a second channel provided in the outer shell and connected to the first channel; a fan configured to send air from one of the first channel and the second channel to the other; a salinity sensor configured to measure salt concentration of sweat of the wearer; a first humidity sensor configured to measure an absolute humidity of intake air entering one of the first channel and the second channel; and a second humidity sensor configured to measure an absolute humidity of exhaust air exiting from the other of the first channel and the second channel.