Thermostatic Gas Sensor Module for Baseline Drift Control
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Solution Overview
Problem
Existing compact gas sensing devices face challenges in maintaining measurement accuracy due to temperature and humidity variations, which affect the baseline readings of sensors like PID and NDIR, leading to inaccurate VOC and CO2 concentration measurements.
Innovation Solution
A thermostatic module with a housing unit, thermal insulation, heat conducting unit, heater, temperature sensor, and control circuitry board maintains a stable temperature environment for the gas sensor, using a Proportional-Integral-Derivative algorithm to regulate heating and prevent cold islands, ensuring accurate VOC and CO2 concentration measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas sensors are used for VOC and CO2 detection, then measurement capability is provided, but temperature and humidity variations cause baseline drift leading to measurement inaccuracy
Solution Approach 1:
The patent introduces a thermostatic module as an intermediary device between the gas sensors and the external environment. This module creates a controlled temperature environment for the sensors, isolating them from external temperature and humidity variations that would otherwise cause baseline drift and measurement inaccuracy.
Solution Approach 2:
The patent changes the temperature parameter of the sensor environment by implementing active heating control through the thermostatic module. By maintaining a constant elevated temperature, the system prevents temperature-induced baseline drift and improves measurement reliability under varying ambient conditions.
2Measurement precision
If a thermostatic module is added to stabilize temperature, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies nesting by placing the gas sensors inside a housing that contains the thermostatic module, which in turn contains the heating elements and temperature control circuitry. This nested structure integrates multiple functions (temperature control, sensor protection, signal processing) into a compact unified device, managing complexity through hierarchical organization.
Solution Approach 2:
The patent combines the thermostatic control system, sensor array, and data processing capabilities into a single integrated device. By merging these previously separate components into one unified system, the patent manages complexity while achieving improved measurement accuracy through coordinated temperature control and multi-sensor detection.
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 thermostatic module stabilizes the temperature environment, enhancing the accuracy and reliability of gas concentration measurements by preventing baseline drifts caused by temperature changes, thus improving the overall performance of compact gas sensing devices.
Implementation Method 1
The heater is provided on the heat conducting unit to generate and then transfer heat to the heat conducting unit
Implementation Method 2
The thermal insulation unit is placed within the first accommodation space
Implementation Method 3
The temperature sensor is provided inside the heat conducting unit to measure temperature inside the heat conducting unit continuously
Data Source
AI summary
A thermostatic module of a compact gas sensing device and a compact gas sensing device are disclosed. The thermostatic module includes a housing unit, a thermal insulation unit, a heat conducting unit, a temperature sensor, a heater and a control circuitry board. The thermal insulation unit is placed inside a first accommodation space provided by the housing unit, and forms therein a second accommodation space in which the heat conducting unit is placed. The interior of the heat conducting unit forms a third accommodation space where gas sensor modules can be housed, and also a gas passage channel. The heater generates and transfers heat to the heat conducting unit, whose interior temperature is constantly probed by the temperature sensor and input to the control circuitry board which dynamically adjusts the heating power by the heater to make sure the measured temperature is always stabilized around a preset target value.