Pressure Measuring Device with Low-Frequency Rotor Detection
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Solution Overview
Problem
Existing pressure measuring devices, particularly those used in vacuum environments, face challenges with instability and inaccuracies due to residual drag and electromagnetic interference, especially at rotation frequencies above 400 Hz, which affect long-term stability and precision.
Innovation Solution
The pressure measuring device operates the rotating body at a rotation frequency of less than 400 Hz, utilizing a generating device to maintain the rotating body within a defined low-frequency range, minimizing residual drag and electromagnetic interference, and employs optical or inductive detection methods to measure the deceleration rate for accurate pressure determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotating body operates at high rotation frequency (above 400 Hz), then the measurement speed and response time are improved, but the residual drag increases causing instability and reduced long-term measurement accuracy
Solution Approach 1:
The patent changes the operational parameter of rotation frequency from the conventional high frequency range (above 400 Hz) to a low frequency range (below 400 Hz, preferably 1-300 Hz). This parameter change reduces residual drag and electromagnetic interference, thereby improving long-term measurement stability while maintaining adequate measurement speed through optimized signal evaluation
2Measurement precision
If the rotating body operates at high rotation frequency, then the signal-to-noise ratio is improved, but electromagnetic interference increases affecting measurement precision
Solution Approach 1:
The patent replaces conventional inductive detection with optical detection methods (laser beam reflection, interferometry). This substitution eliminates electromagnetic interference in the detection system while maintaining high measurement precision through optical signal evaluation of the rotating body's deceleration
3Difficulty of detecting and measuring
If conventional inductive detection is used at high rotation frequencies, then the detection sensitivity is improved, but the system becomes sensitive to electromagnetic interference and residual drag
Solution Approach 1:
The patent substitutes inductive detection with optical detection methods including laser beam reflection and interferometry. This replacement provides high detection sensitivity immune to electromagnetic interference, as optical systems do not suffer from the same environmental sensitivities as inductive systems operating at high frequencies
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 results in more stable, long-term, and highly accurate pressure measurements with reduced sensitivity to environmental factors, enabling precise pressure readings across a wide range without the need for frequent recalibration.
Implementation Method 1
The generating device has a device for generating an external rotating field or is designed as such a device. The external rotating field can be, for example, a magnetic field, an electric field, or an electromagnetic field.
Implementation Method 2
The molecules in the residual gas decelerate the rotating body. The decrease in rotational speed is measured, and the particle density of the gas is determined.
Data Source
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AI summary
The present invention relates to a pressure measuring device (10) and to a method for pressure measurement using such a pressure measuring device (10). The pressure measuring device (10) has a pressure measuring device (11), wherein the pressure measuring device (11) has a rotating body (14). Furthermore, the pressure measuring device (10) has a device (16) for generating a rotation of the rotating body (14) with a defined rotation frequency range. The pressure measuring device (11) can be designed as a gas friction manometer (11a). In order to improve the performance of the pressure measuring device (10), the invention provides that the generating device (16) is provided as a device for generating a rotation of the rotating body (14) with a rotation frequency range of less than 400 Hz.