Laser Blood Flow Sensor for Presence Detection
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Solution Overview
Problem
Existing sensor systems in toilet rooms require multiple sensors to determine if a user is in a state where biological information can be detected, which increases complexity and space requirements.
Innovation Solution
A sensor device comprising a laser blood flow sensor and a control device that acquires biological information, including blood flow information, and determines the presence or absence of a human body based on this information, reducing the need for multiple sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a seating sensor is used to determine whether a user is in a state where biological information is detectable, then detection accuracy is improved, but the number of sensors increases
Solution Approach 1:
The laser blood flow sensor is designed to perform multiple functions: it detects blood flow information (original function) and simultaneously detects presence or absence of a human body (additional function). By analyzing the intensity of scattered light received by the sensor, the system can determine whether a user is present without requiring a separate seating sensor, thus achieving multi-functionality with a single device
Solution Approach 2:
The patent combines the blood flow detection function and the presence detection function into a single laser blood flow sensor system. The control device integrates both detection capabilities by processing the scattered light signal in different ways: analyzing Doppler shift for blood flow information and analyzing signal intensity for presence detection, thereby merging two detection functions into one sensor system
2Reliability
If multiple sensors are used to determine user presence and blood flow information, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The laser blood flow sensor serves dual purposes: detecting blood flow information through Doppler shift analysis and detecting user presence through scattered light intensity analysis. This multi-functionality maintains detection reliability by ensuring accurate blood flow measurement while simultaneously providing presence detection, eliminating the need for additional sensors and reducing overall system complexity
Solution Approach 2:
The control device merges the processing of scattered light signals to extract both blood flow information (via Doppler shift) and presence information (via signal intensity). This integrated approach consolidates multiple detection functions into a single processing pipeline, reducing device complexity while maintaining reliable detection of both user presence and blood flow parameters
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 system effectively detects the presence of a human body and acquires biological information with improved accuracy and reduced sensor count, enhancing detection efficiency and space utilization in toilet rooms.
Implementation Method 1
emits laser light toward a human body, receives scattered light from a body tissue, an erythrocyte(s), etc., and detects a Doppler shift of a received signal
Implementation Method 2
receives scattered light from a body tissue, an erythrocyte(s)
Data Source
AI summary
A sensor device includes a laser blood flow sensor and a control device. The laser blood flow sensor is provided in a toilet room and acquires biological information that includes blood flow information of a user. The control device controls the laser blood flow sensor. The control device determines presence or absence of a human body, based on information that is acquired by the laser blood flow sensor.