Gas Sensor Flow Compensation for Accurate Concentration Detection
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Solution Overview
Problem
Existing gas sensors face measurement errors due to variations in gas flow velocity in the measuring atmosphere, which affect the accuracy of gas concentration detection.
Innovation Solution
A gas sensor design that includes a control circuit to correct the output signal and adjust heating conditions of thermistors based on flow velocity signals, using correction tables or tables indicating the relationship between flow velocity and heater voltages or heating times, to maintain accurate gas concentration measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas concentration is measured using a temperature-sensitive element and heater, then gas concentration detection is enabled, but measurement accuracy deteriorates due to gas flow velocity variations
Solution Approach 1:
The patent introduces a flow velocity detection mechanism that provides feedback about the gas flow conditions to the control circuit. Based on this feedback, the system dynamically adjusts heating parameters (voltage, current, or power) to compensate for flow-induced measurement errors, thereby maintaining accurate gas concentration measurements despite varying flow velocities
Solution Approach 2:
The patent changes the heating parameters (voltage, current, or power) of the heater based on detected gas flow velocity. By adjusting these parameters dynamically, the system compensates for the cooling effect of gas flow on the temperature-sensitive element, ensuring that the element maintains its operational temperature and measurement accuracy across different flow conditions
2Measurement precision
If heating power is increased to maintain temperature stability, then measurement accuracy improves, but energy consumption increases
Solution Approach 1:
The patent transitions from static heating (constant power) to dynamic heating where the heating parameters are continuously adjusted based on real-time flow velocity detection. This allows the system to apply only the necessary heating power required to maintain temperature stability under current flow conditions, avoiding excessive energy consumption while preserving measurement accuracy
Solution Approach 2:
The patent dynamically changes heating parameters (voltage, current, or power) based on detected flow velocity conditions. Under low flow conditions, heating power is reduced to save energy, while under high flow conditions, heating power is increased only to the extent necessary to maintain temperature stability, thus optimizing the balance between measurement precision and energy consumption
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
Enables precise gas concentration detection irrespective of gas flow velocity by compensating for measurement errors caused by atmospheric flow, ensuring consistent and reliable sensor performance.
Implementation Method 1
a heater configured to heat the temperature-sensitive element
Implementation Method 2
a temperature-sensitive element configured to generate a detection signal corresponding to a concentration of a gas to be detected
Data Source
AI summary
Disclosed herein is a gas sensor that includes: a sensor part configured to generate a detection signal corresponding to a concentration of a gas to be detected; and a control circuit configured to calculate, based on the detection signal, an output signal indicating the concentration of the gas to be detected. The sensor part includes a temperature-sensitive element and a heater configured to heat the temperature-sensitive element. The control circuit is configured to correct the output signal or change a heating condition of the heater in accordance with a flow velocity signal indicating gas flow velocity in measuring atmosphere.