Laser Ultrasonic Measurement Light Blocking Structure
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Solution Overview
Problem
Existing laser ultrasonic property measurement apparatuses require close attachment of light shielding covers to prevent scattered and reflected laser light, which is impractical for objects with hot temperatures, uneven surfaces, or in production line settings due to safety concerns and potential surface flaws.
Innovation Solution
A laser ultrasonic property measurement apparatus with a light blocking structure that allows the object to pass through, featuring openings and light blocking plates positioned to attenuate scattered light, eliminating the need for close attachment and enabling safe operation by reducing laser light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light shielding covers are attached close to the object of measurement to prevent laser light leakage, then worker safety is improved, but the object of measurement may have hot temperatures, move, or have uneven surfaces causing attachment difficulty and potential surface flaws
Solution Approach 1:
A light blocking plate is introduced as an intermediary element between the light shielding cover and the object of measurement. This plate can be attached to the cover rather than directly to the object, serving as a mediator that prevents direct contact between the cover and the measurement object, thereby avoiding surface flaws while maintaining light blocking effectiveness
Solution Approach 2:
The solution moves from a two-dimensional attachment problem (cover to object surface) to a three-dimensional configuration where the light blocking plate extends into the space between the cover and object. This dimensional change allows the plate to block light leakage without requiring close attachment to the object surface
2Object-generated harmful factors
If light shielding covers are attached close to the object of measurement, then laser light leakage is reduced, but the object of measurement may have hot temperatures causing cover wear and measurement issues
Solution Approach 1:
The light blocking plate serves as a thermal barrier and intermediary element between the light shielding cover and the hot object of measurement. It blocks laser light leakage while preventing direct thermal contact between the cover and the hot object, reducing heat transfer and cover wear
Solution Approach 2:
The light blocking plate is attached to the light shielding cover in advance, creating a pre-assembled unit that blocks laser light before the cover approaches the hot object. This preliminary configuration ensures light leakage is prevented without requiring the cover to be in close contact with the hot object surface
3Measurement precision
If high-power laser light is used to excite ultrasonic waves and enable interferometer measurements, then measurement capability is improved, but scattered and reflected laser light intensities increase creating safety hazards
Solution Approach 1:
The light shielding cover with light blocking plate, while primarily designed to block harmful laser light, also serves to contain and direct the high-power laser beam more effectively toward the measurement point. The structured shielding converts the potential harm of scattered light into beneficial control of the laser path
Solution Approach 2:
The light blocking plate acts as an intermediary that manages the interaction between high-power laser light and the surrounding environment. It blocks scattered and reflected light while allowing the primary beam to pass through to the object, mediating between the high-power source and the measurement field
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
Facilitates safe and efficient measurement of objects with hot temperatures and uneven surfaces without surface flaws, allowing for easy transfer and reduced laser light leakage, enabling implementation on production lines.
Implementation Method 1
pulse laser light is shot to an obverse side of an object of measurement M (typically, a metal), causing small-scale explosions (ablations) on the object of measurement M, thereby producing pulsed ultrasonic waves in the object M
Implementation Method 2
between reflected light of that and reference light, interferences are caused, using an interferometer 86, whereby fine vibrations appearing at the reverse side of the object of measurement M can be read as voltage signals
Data Source
AI summary
A mode of the present invention includes a transmitter (12) for shooting exciting laser light to an object of measurement (M) to excite ultrasonic waves in the object of measurement (M), a receiver (14) for shooting probing laser light to the object of measurement (M) to receive reflected light of probing laser light from the object of measurement (M) for detection of ultrasonic waves, a light blocking structure (16) having a first opening (16a) allowing the object of measurement (M) to pass therethrough and operable to accommodate the object of measurement (M), and a cover (18) operable to cover and open the first opening (16a).