Doppler Radar Vibration Sensor with Acceleration Compensation
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Solution Overview
Problem
Existing vibration frequency measurement methods for tight drive belts using Doppler radar are inaccurate due to movement of the hand-held measuring head not being accounted for, leading to erroneous results.
Innovation Solution
Incorporating an acceleration sensor with the Doppler radar module to offset signals and disregard pulses during movement, and using an optical positioning aid to maintain a constant distance, ensuring accurate measurements by ignoring Doppler radar impulses during acceleration phases and using the acceleration sensor's pulses to correct Doppler radar signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hand-held Doppler radar module is used for vibration measurement, then the measurement can be performed portably and on tight drive belts, but movement of the measuring head during measurement causes errors and reduces accuracy
Solution Approach 1:
An acceleration sensor is introduced as an intermediary device to detect movements of the measuring head. The acceleration sensor's output signal serves as a mediator to identify when hand-held movement occurs, allowing the system to distinguish between valid vibration signals and artifacts caused by operator movement.
Solution Approach 2:
The harmful effect of hand-held movement is extracted and isolated through the acceleration sensor. By separately detecting movement artifacts and removing them from the Doppler radar signal evaluation, the system eliminates the source of measurement errors while preserving the portability benefit.
2Productivity
If signals from the Doppler radar are evaluated directly, then the measurement process is simple and fast, but movement of the measuring head is not accounted for, leading to erroneous results
Solution Approach 1:
The acceleration sensor provides continuous feedback about the motion state of the measuring head. This feedback signal is processed to generate movement detection information that is fed back into the signal evaluation process, enabling real-time correction or rejection of measurements taken during unwanted movement.
Solution Approach 2:
The evaluation process becomes dynamic by continuously monitoring the acceleration signal and adapting the interpretation of Doppler radar data based on the current motion state. The system dynamically adjusts which signals are accepted or rejected based on real-time movement detection, maintaining reliability without sacrificing measurement speed.
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 significantly enhances the accuracy and reliability of vibration frequency measurements by accounting for hand-held movement and maintaining a consistent measurement distance, resulting in more precise evaluations of vibration data on drive belts.
Implementation Method 1
a so-called Doppler radar that transmits a microwave beam using a transmit antenna against a vibrating surface and receives the signal using a receive antenna and evaluates it according to the Doppler principle
Implementation Method 2
an acceleration sensor is additionally provided, and that the signals of the Doppler radar are offset against those of the acceleration sensor
Implementation Method 3
two LEDs located at a distance from each other are provided, which project two light beams intersecting on the surface of the belt downwards and forwards
Data Source
AI summary
Device (1) for manually measuring the frequency of vibrations on a tight drive belt (6, 6′, 6″), comprising a Doppler radar module (3) which uses a transmit antenna (4) for emitting a transmit beam (8) onto a vibrating surface of the drive belt (6, 6′, 6″) as well as a receive antenna (5) for receiving the receive beam (9) reflected by the surface and evaluates the receive beam (9) according to the Doppler principle, the vibration sensor (1) also comprising an acceleration sensor (10) in addition to the Doppler radar module (3), the signals of the acceleration sensor (10) being calculated along with the signals of the Doppler radar module, thus allowing some signals to be disregarded.