Pressure Sensor Temperature Compensation via Periodic Sampling
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Solution Overview
Problem
Existing pressure sensing schemes face challenges in accurately determining calibrated pressure measurements due to temperature sensitivity, which often require concurrent temperature measurement, leading to power consumption and noise introduction from active temperature sensing components.
Innovation Solution
A sensing device with multiple sensing arrangements that stores raw temperature measurement values from a previous sampling time, allowing the pressure sensing arrangement to operate independently to obtain updated pressure measurements, thereby deactivating the temperature sensing arrangement to conserve power and reduce noise, and using these stored values to calculate calibrated pressure measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If concurrent temperature measurement is performed to compensate for temperature sensitivity in pressure sensing, then measurement precision is improved, but power consumption increases and noise is introduced
Solution Approach 1:
The patent performs temperature measurement at predetermined intervals before pressure measurement, and stores the temperature value for later use in pressure calibration. This preliminary temperature sampling allows the system to compensate for temperature effects in subsequent pressure measurements without requiring continuous temperature sensing, thereby reducing power consumption while maintaining measurement accuracy.
Solution Approach 2:
The patent implements periodic temperature measurement at predetermined intervals rather than continuous measurement. The temperature sensor is activated only at these scheduled intervals to capture temperature data that will be used for calibrating multiple subsequent pressure measurements. This periodic approach significantly reduces the average power consumption compared to concurrent continuous measurement while still providing effective temperature compensation.
2Measurement precision
If concurrent temperature measurement is performed to compensate for temperature sensitivity in pressure sensing, then measurement precision is improved, but noise introduction increases
Solution Approach 1:
The patent performs temperature measurement before pressure measurement and stores the temperature value for calibration purposes. By obtaining the temperature data in advance and keeping the temperature sensing circuit inactive during pressure measurement, the system eliminates noise that would be introduced by active temperature sensing components during the critical pressure measurement phase, while still achieving temperature compensation through the stored preliminary temperature value.
3Measurement precision
If temperature sensing arrangement remains active for continuous measurements, then measurement precision is maintained, but power consumption increases
Solution Approach 1:
The patent activates the temperature sensing arrangement only at predetermined intervals to capture temperature samples, then deactivates it for subsequent pressure measurements. The stored temperature values are reused for calibrating multiple pressure measurements taken between temperature sampling events. This periodic activation pattern maintains calibrated measurement accuracy through temperature compensation while dramatically reducing the average power consumption compared to continuous temperature sensing.
Solution Approach 2:
The patent performs preliminary temperature measurement and stores the value before entering a measurement sequence. This stored temperature data is then used for calibrating subsequent pressure measurements without requiring the temperature sensor to remain active. By performing the temperature measurement action in advance and reusing the result, the system maintains measurement precision while minimizing the time the power-hungry temperature sensor remains active.
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
This approach enables accurate and power-efficient temperature-compensated pressure measurements by eliminating the need for continuous temperature sensing, reducing noise and power consumption in successive measurements.
Implementation Method 1
an electronic device may include a pressure sensor that is fabricated on a semiconductor die and generates electrical signals indicative of the amount of pressure exerted on the semiconductor die
Implementation Method 2
temperature sensitivity can influence electrical characteristics of the components of the pressure sensor
Data Source
AI summary
Apparatus, systems, and fabrication methods are provided for sensing devices. An exemplary sensing device includes a first sensing arrangement to measure a first property and provide one or more measured values for the first property, a second sensing arrangement to measure a second property, a storage element coupled to the second sensing arrangement to maintain a stored value for the second property measured by the second sensing arrangement, and a control system coupled to the first sensing arrangement and the storage element to determine one or more calibrated measurement values for the first property using the one or more measured values for the first property from the first sensing arrangement and the stored value for the second property.