Thermophone Object Detection with Adjustable Sound Pressure
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Solution Overview
Problem
Existing object detection systems using ultrasound waves face challenges in detecting both near and distant objects due to the influence of direct sound pressure, which limits their detection range and accuracy.
Innovation Solution
An object detection system that generates acoustic waves by thermal excitation, allowing for adjustable sound pressure based on the detection range, using a thermophone as the acoustic wave source and a processing circuit to control the sound pressure for optimal detection, enabling broader detection ranges by adjusting the sound pressure according to the distance of the object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the sound pressure of an ultrasound wave is made high to detect distant objects, then the detection range is extended, but the influence of direct sound increases and near objects become less likely to be detected
Solution Approach 1:
The patent applies dynamics by making the sound pressure adjustable rather than fixed. The acoustic wave generator can dynamically change its output sound pressure based on the detection requirements, allowing high sound pressure for distant objects and low sound pressure for near objects, thus resolving the contradiction between detection range and detection accuracy
Solution Approach 2:
The patent changes the parameter of sound pressure from a constant value to a variable value. By adjusting the sound pressure parameter according to the distance to the target object, the system can optimize detection performance for both near and distant objects, eliminating the trade-off between detection range and accuracy
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 system effectively broadens the detection range by increasing sound pressure for distant objects and reducing it for near objects, improving detection accuracy and reducing false positives from direct sound interference.
Implementation Method 1
an acoustic wave generator 10 to generate an acoustic wave by generating heat upon energization
Implementation Method 2
generate an acoustic wave by generating heat upon energization
Implementation Method 3
a wave receiver 20 to receive an acoustic wave from the target space
Data Source
AI summary
An object detection system includes an acoustic wave generator to generate an acoustic wave by generating heat upon energization and a processing circuit to perform object detection processing to detect an object in target space using an acoustic wave generated by the acoustic wave generator. The object detection processing includes setting processing, wave transmission processing, and determination processing. The setting processing sets a search range corresponding to a distance to the object in the target space. The wave transmission processing controls the acoustic wave generator to generate an acoustic wave at a target sound pressure associated with a search range set in the setting processing. The determination processing acquires, from a wave receiver to receive an acoustic wave from the target space, a received-wave signal representing an acoustic wave received by the wave receiver and determines whether the object is present based on the received-wave signal.