Ultrasonic Sensor Shell with Elongated Aperture for Crosstalk Reduction
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Solution Overview
Problem
Ultrasonic sensors face issues with direct wave transmission between the transmitting and receiving units, leading to reduced efficiency and detection blind areas due to crosstalk and reflection from small objects on the ground.
Innovation Solution
The ultrasonic sensing device employs a unique shell structure with elongated openings to separate the transmitting and receiving units, utilizing diffraction to concentrate and expand the ultrasonic wave in specific directions, reducing direct transmission and enhancing detection by minimizing reflections from small objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the transmitting unit and receiving unit are placed close together, then the device size is reduced, but direct transmission of ultrasonic wave from transmitting unit to receiving unit occurs causing crosstalk
Solution Approach 1:
The device is segmented into a transmitting end assembly and a receiving end assembly that are spatially separated. The transmitting end includes a transmitting unit in a first cavity, while the receiving end includes a receiving unit in a second cavity. This segmentation prevents direct transmission between units while maintaining a compact overall structure.
Solution Approach 2:
A partition wall with a through-hole acts as an intermediary structure between the transmitting and receiving units. The through-hole allows ultrasonic waves to pass from the transmitting end to the receiving end while maintaining physical separation between the units, thus preventing direct transmission crosstalk.
2Length of stationary object
If the ultrasonic wave is transmitted horizontally, then the detection range is extended, but the ultrasonic wave is reflected by small objects on the ground causing detection blind areas
Solution Approach 1:
The partition wall is designed with an asymmetric through-hole configuration where the hole is positioned closer to the transmitting end than to the receiving end. This asymmetric arrangement causes the ultrasonic wave to propagate at an upward angle rather than horizontally, avoiding reflection from ground objects while extending detection range.
Solution Approach 2:
The position parameter of the through-hole in the partition wall is optimized to change the propagation angle of the ultrasonic wave. By positioning the hole closer to the transmitting end, the wave angle is adjusted to ascend away from the ground, eliminating detection blind areas caused by ground reflections.
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 configuration significantly reduces direct wave transmission, narrows the vertical transmission range, and widens the horizontal range, thereby improving detection accuracy and reducing blind areas when detecting front obstacles.
Implementation Method 1
The transmitting unit transmits ultrasonic wave outside
Implementation Method 2
an external object reflects the ultrasonic wave
Implementation Method 3
the ultrasonic wave exiting from the second opening diffracts, and is concentrated within the transmission range of ultrasonic wave in the long axis direction of the second opening and expanded within the transmission range of ultrasonic wave in the short axis direction of the second opening
Data Source
AI summary
The disclosure discloses an ultrasonic sensing device, including a first shell portion, a second shell portion and an ultrasonic sensor. The first shell portion has a first through hole. The first through hole includes a first opening and a second opening. The second shell portion has a second through hole. The second through hole includes a third opening and a fourth opening. The ultrasonic sensor includes a transmitting unit and a receiving unit. The transmitting unit is coupled to the first opening. The receiving unit is coupled to the third opening. At least one of the second opening and the fourth opening is elongated. The ultrasonic sensing device greatly reduces the direct transmission of ultrasonic wave from the transmitting unit to the receiving unit.