Single-Ultrasonic-Vibrator Motion Detection With Reduced Blind Spots
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Solution Overview
Problem
Conventional moving object detecting apparatuses require a large installation space due to separate transmitters and receivers for ultrasonic waves, making it difficult to secure installation and reducing the monitoring space, especially in vehicles.
Innovation Solution
A compact moving object detecting apparatus using a single ultrasonic vibrator for both transmission and reception, with a phase detection circuit that reduces the influence of transmission signals on reception signals, allowing for simultaneous transmission and reception and extending the monitoring space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate transmitters and receivers are used for ultrasonic waves, then the detection function is reliable, but the installation space requirement increases
Solution Approach 1:
The patent combines the transmitter and receiver into a single integrated unit that uses one ultrasonic vibrator for both transmitting and receiving ultrasonic waves. This merging eliminates the need for separate transmitter and receiver components, thereby reducing installation space while maintaining the detection function through sequential transmission and reception operations.
Solution Approach 2:
The single ultrasonic vibrator serves dual functions: it acts as both a transmitter for radiating ultrasonic waves and a receiver for detecting reflected waves. This multi-functionality allows the same component to perform multiple roles, reducing the overall number of components needed and minimizing installation space requirements.
2Measurement precision
If separate transmitters and receivers are used, then the detection accuracy is maintained, but the monitoring space is reduced
Solution Approach 1:
The system uses periodic transmission and reception cycles where the ultrasonic vibrator alternates between transmitting ultrasonic waves and receiving reflected waves. This periodic operation allows the single component to maintain detection accuracy by clearly separating transmission and reception phases in time, while the integrated design expands the effective monitoring space.
3Area of stationary object
If a single ultrasonic vibrator is used for both transmission and reception, then the installation space is reduced, but the transmission signal interference with reception signal increases
Solution Approach 1:
The system implements periodic transmission and reception cycles with clear temporal separation. The ultrasonic vibrator transmits during specific time intervals and receives during other intervals, preventing the transmission signal from interfering with the reception signal. This time-division approach allows a single vibrator to function as both transmitter and receiver without signal contamination.
Solution Approach 2:
The system preemptively prevents interference by controlling the timing of transmission and reception operations. Before receiving a signal, the system ensures that transmission has ceased, and before transmitting, it stops receiving. This preliminary anti-action eliminates the possibility of transmission signals contaminating reception signals in the single-vibrator configuration.
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
The solution enables easier installation and reduces blind spots by using a single ultrasonic vibrator for both transmission and reception, improving the detection of moving objects and expanding the monitoring space without increasing the apparatus size.
Implementation Method 1
detecting a frequency deviation in waves reflected from the object moving within the monitoring space, the frequency deviation being caused due to the motion of the object
Implementation Method 2
radiating continuous energy waves such as ultrasonic waves, radio waves, or the like to the monitoring space and detecting a frequency deviation in waves reflected from the object
Data Source
AI summary
A moving object detecting apparatus includes: a transmitting/receiving unit for radiating an ultrasonic wave and receiving a reflective wave reflected from an object present in a monitoring space; a phase detection circuit for mixing reference signals with a reflective signal and obtaining a pair of Doppler signals each having an amplitude depending on a phase difference from the reference signal, each of the Doppler signals having a different phase from each other; a rotation angle calculation unit for calculating a rotation angle; a cumulative addition unit for accumulating the rotation angle; and a comparison unit for comparing the accumulated rotation angle with a threshold value. In the moving object detecting apparatus, a single ultrasonic vibrator is commonly used in the transmitting unit and the receiving unit.