Infrared Array Sensor View Finder for Accurate Temperature Measurement
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Solution Overview
Problem
Conventional thermal detection devices face challenges in accurately measuring temperature and thermal distribution across a subject's body, particularly when the subject is stationary or has uneven temperature distribution, due to the limitations of pyroelectric and thermopile sensors, which struggle with continuous infrared detection and require precise adjustment of distance and angle, leading to errors and insufficient accuracy.
Innovation Solution
A portable device equipped with an infrared array sensor module, a controller, and a display module that uses a view finder with an indicator to select valid pixels for temperature measurement, allowing for accurate calculation of ambient temperature and correction of sensor values, enabling precise temperature measurement of specific body parts like the forehead, ear, or hand, while adjusting distance and angle for optimal measurement conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyroelectric sensor is used for thermal detection, then the device can detect infrared rays from moving subjects, but it cannot detect stationary subjects because it does not generate electric signal when infrared rays are continuously incident
Solution Approach 1:
The patent divides the detection task into two independent sensor types: pyroelectric sensors for detecting moving subjects and thermopile sensors for detecting stationary subjects. This segmentation allows each sensor type to operate in its optimal detection mode, with the controller selectively activating the appropriate sensor based on the subject's movement status.
Solution Approach 2:
The patent creates a universal thermal detection device that can handle both moving and stationary subjects by integrating multiple sensor types with different detection mechanisms. The system universally covers all detection scenarios by selecting the appropriate sensor type based on the subject's characteristics.
2Reliability
If thermopile array sensor is used to measure thermal pictures, then stationary subjects can be detected, but precise adjustment of distance and angle is still required, leading to measurement errors
Solution Approach 1:
The patent implements feedback mechanisms where the controller receives detection data from both pyroelectric and thermopile sensors, processes the information, and adjusts measurement parameters accordingly. The system uses feedback from valid pixel identification and ambient temperature correction to continuously improve measurement precision and compensate for distance and angle variations.
Solution Approach 2:
The patent performs preliminary actions by pre-identifying valid pixels that correspond to the subject's body parts before final temperature measurement. The system also pre-calculates ambient temperature values and prepares correction factors in advance, ensuring that measurements are taken with optimized parameters before the actual temperature reading is made.
3Device complexity
If ambient temperature is not corrected, then measurement process is simpler, but temperature measurement accuracy decreases due to sensor temperature effects
Solution Approach 1:
The patent implements self-service by having the system automatically detect ambient temperature using the thermopile sensor, calculate correction values, and apply corrections to the final temperature measurement without requiring external intervention. The device serves itself by autonomously compensating for temperature drift and ambient conditions.
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 device provides more accurate and convenient temperature measurement by selecting valid pixels and calculating ambient temperature, enhancing reliability and ease of use, and allowing for precise detection of thermal distribution across the body without the need for precise adjustment.
Implementation Method 1
an infrared array sensor module (102) configured to take temperature values in a unit of pixel, including a plurality of infrared sensors arranged in an array of pixels
Implementation Method 2
a controller (101) configured to calculate a resultant temperature value of a subject with reference to the temperature values taken each by the sensors
Data Source
AI summary
Disclosed is a portable device for measuring temperature with infrared array sensor. This portable device includes: an infrared array sensor module for taking temperature values in a unit of pixel and including a plurality of infrared sensors arranged in an array of pixels; a controller for calculating a resultant temperature value of a subject with reference to the temperature values taken each by the sensors; a display for expressing the resultant temperature value calculated by the controller; and a view finder with an indicator defining a target point to be measured for temperature and having a profile corresponding to the whole or a local shape of the subject. The view finder is formed of a transparent plate on which the subject's shape is reflected. The transparent plate is formed of: a notch representing the indicator; and a lens at least provided in the indicator.