Ultrasonic Inspection Waveguide Attenuates Reflected Waves
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Solution Overview
Problem
Current ultrasonic inspection devices face challenges in increasing detection sensitivity, particularly when inspecting objects at high speeds, due to the superimposition of reflected waves with direct waves, which complicates accurate analysis.
Innovation Solution
The implementation of a receiving-side waveguide with a tubular member and an inner member featuring a mesh, porous, or surface unevenness structure, which attenuates the ultrasonic wave, reducing transmittance to less than 0.55 and minimizing the impact of reflected waves, allowing for more accurate and sensitive inspections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional ultrasonic inspection device is used, then the inspection can be performed, but the detection sensitivity is insufficient due to superimposition of reflected waves with direct waves
Solution Approach 1:
The patent converts the harmful reflected waves into a beneficial effect by using a waveguide with specific acoustic impedance to selectively transmit direct waves while attenuating reflected waves. The waveguide's acoustic impedance is designed to match the direct wave characteristics, allowing it to pass through, while the reflected waves are absorbed or blocked, thus converting the interference problem into a signal enhancement mechanism
Solution Approach 2:
The waveguide acts as an intermediary component between the ultrasonic wave source and the inspection target. It mediates the wave transmission by selectively allowing direct waves to pass while blocking reflected waves, thus improving detection sensitivity without requiring changes to the fundamental inspection system
2Use of energy by moving object
If the waveguide transmittance is increased to improve signal strength, then direct wave intensity increases, but reflected wave interference also increases
Solution Approach 1:
The waveguide is designed with non-uniform cross-sectional area along its length, creating different local acoustic impedance characteristics. The cross-section is larger at the ultrasonic wave source side and smaller at the target side, which creates a gradient that preferentially transmits direct waves while attenuating reflected waves, thus achieving local optimization of wave transmission properties
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 enhances detection sensitivity by effectively suppressing the effects of reflected waves, enabling high-speed and accurate inspections by prioritizing direct wave intensity over reflected wave noise, thereby improving the inspection process.
Implementation Method 1
a receiving-side waveguide with a tubular member and an inner member featuring a mesh, porous, or surface unevenness structure, which attenuates the ultrasonic wave, reducing transmittance to less than 0.55 and minimizing the impact of reflected waves
Data Source
AI summary
According to one embodiment, an inspection device includes a transmitter configured to transmit a first ultrasonic wave, a receiver on which the first ultrasonic wave is incident, and a receiving-side waveguide located between the receiver and an inspection position. The receiver is configured to output a signal corresponding to the incident first ultrasonic wave. The inspection position is between the transmitter and the receiver. The first ultrasonic wave passes through the receiving-side waveguide. An inspection object passes through the inspection position along a second direction crossing a first direction. The first direction is from the transmitter toward the receiver. The receiving-side waveguide includes at least one of a first structure or a second structure. In the first structure, the receiving-side waveguide includes a tubular member and an inner member. The inner member is located inside the tubular member. In the second structure, the receiving-side waveguide includes a tubular member.