Doppler Sensor for Spherical Body Rotation Speed Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for measuring the rotation speed of spherical moving bodies are costly, require large-scale systems, are difficult to automate, limit application due to sensor integration issues, and face challenges with stable measurement and size reduction.
Innovation Solution
A compact rotation speed measurement device using a directional antenna to transmit and receive Doppler signals, coupled with a Doppler sensor and input unit for diameter information, allowing for calculation and display of movement and rotation speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image analysis technology is used to measure rotation speed, then measurement capability is achieved, but system cost and scale increase significantly
Solution Approach 1:
The patent replaces the mechanical/optical image analysis system with an electromagnetic wave-based Doppler measurement system. The Doppler sensor uses radio waves to detect rotation speed, eliminating the need for cameras and complex image processing equipment, thereby reducing system scale and cost while maintaining measurement capability.
Solution Approach 2:
The patent changes the measurement parameter from visual/image domain to electromagnetic wave frequency domain. By measuring the Doppler shift of reflected radio waves instead of analyzing images, the system achieves rotation speed measurement with simpler, more compact equipment.
2Measurement precision
If acceleration sensor is installed within spherical body, then rotation speed can be measured, but spherical body properties deviate from normal
Solution Approach 1:
The patent replaces the internal acceleration sensor (mechanical/electronic system) with an external Doppler radar system. This allows rotation speed measurement without modifying the spherical body structure, preserving its normal properties and expanding applicability to various spherical objects including sports balls, medical devices, and industrial components.
3Measurement precision
If Doppler method is used with separate transmission and receiving equipment, then movement speed can be measured, but measurement stability decreases
Solution Approach 1:
The patent merges the transmission antenna and reception antenna into a single integrated Doppler sensor unit. This unified structure ensures stable relative positioning between transmission and reception components, improving measurement stability and reliability while maintaining the Doppler effect-based speed measurement capability.
4Measurement precision
If conventional Doppler equipment is used, then movement speed measurement is possible, but equipment size is large
Solution Approach 1:
The patent combines multiple functional components (transmission antenna, reception antenna, Doppler sensor, and processing unit) into a single integrated measurement device. This consolidation significantly reduces equipment size while maintaining Doppler-based speed and rotation measurement capabilities, making the system portable and suitable for various application scenarios.
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 accurate and simple measurement of rotation and movement speeds with reduced equipment size, improved automation, and expanded application scope.
Implementation Method 1
an antenna having directivity, that transmits a transmission wave to a spherical moving body based on a supplied transmission signal, and receives a reflection wave reflected at the moving body and generates a received signal
Implementation Method 2
a Doppler sensor that supplies the transmission signal to the antenna, and generates a Doppler signal having a Doppler frequency based on the received signal
Data Source
AI summary
Provided is a moving body rotation speed measurement device that makes it possible for a user or the like to easily measure the rotation speed of a spherical moving body. An input unit receives diameter information about a spherical moving body. A measurement processing unit calculates the movement speed and rotation speed of the moving body on the basis of a Doppler signal and the diameter information. The measurement processing unit calculates the movement speed using the maximum peak value of a Doppler signal obtained continuously over a predetermined measurement time and calculates the rotation speed using the maximum frequency width value of the Doppler signal. A display unit shows display content that includes the calculated movement speed and rotation speed.