Sensor Module Distance Compensation for Temperature Accuracy
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Solution Overview
Problem
Conventional infrared sensors experience a decrease in measurement accuracy due to changes in distance from the measurement object, as infrared rays are absorbed and reduced in the atmosphere, leading to variations in measured temperature.
Innovation Solution
A sensor module that combines a temperature sensor and a distance sensor on a flexible circuit board, using a laser detection auto-focusing device to measure distance and compensate for temperature variations, with a heat dissipation substrate and nitride resin additives for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional infrared sensor measures temperature without distance compensation, then the measurement process is simple, but the measurement accuracy deteriorates as distance changes
Solution Approach 1:
The patent combines a temperature sensor and a distance sensor into a single integrated sensor module. The temperature sensor measures the target object's temperature while the distance sensor simultaneously measures the distance to the target. This merging allows the system to compensate for distance-related measurement errors without requiring separate, complex measurement systems, thereby improving temperature measurement accuracy while maintaining relatively simple device structure.
Solution Approach 2:
The patent implements a feedback mechanism where the distance sensor continuously monitors the distance to the target object, and this distance information is fed back to adjust the temperature measurement. The system uses the measured distance to compensate for atmospheric absorption and other distance-related effects, creating a closed-loop control that maintains measurement accuracy across varying distances.
2Measurement precision
If the temperature sensor is exposed to the outside environment, then temperature measurement is direct and accurate, but thermal noise from the environment increases
Solution Approach 1:
The patent applies local quality by creating a selective exposure structure where the temperature sensor is exposed to the target object through a designated opening while being protected from general environmental thermal noise. The sensor's exposure is localized to only what is necessary for measurement, with the rest of the sensor structure shielded by the housing and positioning mechanisms, thus maintaining measurement accuracy while reducing unwanted thermal interference.
Solution Approach 2:
The patent introduces an intermediary structure (the sensor housing and positioning mechanism) that mediates between the temperature sensor and the external environment. This intermediary allows the sensor to observe and measure the target object while blocking direct exposure to environmental thermal noise, effectively acting as a selective interface that permits necessary measurement interactions while filtering out harmful thermal interference.
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 enhances measurement accuracy by compensating for distance-related temperature changes, reduces manufacturing time and cost through modularization, and improves user convenience and thermal noise minimization.
Implementation Method 1
A general non-contact infrared sensor includes a first element for absorbing infrared rays radiated from a measurement object to generate an electrical signal
Implementation Method 2
a distance sensor disposed on the flexible circuit board to be adjacent to the temperature sensor and measuring a distance to the measurement object
Data Source
AI summary
A sensor module includes: a flexible printed circuit board; a temperature sensor disposed on the flexible printed circuit board to measure the temperature of a measurement object; a distance sensor disposed on the flexible circuit board adjacent to the temperature sensor to measure the distance to the measurement object; a terminal cover disposed above the temperature sensor and the distance sensor and including a first hole exposing a top surface of the temperature sensor and a second hole exposing a top surface of the distance sensor; and a window disposed in the second hole of the terminal cover.