Form Measuring Apparatus with Phase Shifting and Reference Light Detection
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Solution Overview
Problem
Existing form measuring apparatuses face inefficiencies in generating three-dimensional form data under certain imaging conditions, leading to the need for repeated measurements when imaging conditions change.
Innovation Solution
A form measuring apparatus that uses a phase shifting technique with an N-bucket method to change the initial phase of structured light, taking images with different initial phases and utilizing a reference light to detect target areas based on signal intensity differences, allowing for efficient form measurement even under varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If form measurement is performed under certain imaging conditions, then three-dimensional form data can be generated, but measurement efficiency decreases when imaging conditions change requiring repeated measurements
Solution Approach 1:
The system performs a preliminary area determination process before actual form measurement to identify target areas where three-dimensional data can be generated. By pre-determining suitable measurement areas based on imaging conditions, the system avoids attempting measurements in unsuitable areas, thereby improving overall measurement efficiency and reducing wasted measurement attempts.
2Reliability
If repeated measurements are performed under changed imaging conditions, then measurement completeness is maintained, but measurement time increases
Solution Approach 1:
The system determines target areas in advance by evaluating imaging conditions before measurement. This preliminary area determination identifies which regions can successfully generate three-dimensional data under current conditions, allowing the system to proceed directly to measurement only in suitable areas without time-consuming repeated measurements.
Solution Approach 2:
The system uses feedback from area determination results to guide the measurement process. By evaluating whether imaging conditions are suitable for generating three-dimensional data and using this information to select target areas, the system adapts its measurement strategy to avoid unnecessary repeated measurements while ensuring measurement completeness where conditions permit.
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 apparatus improves measurement efficiency by predetermining areas where three-dimensional data can be generated, reducing the need for repeated measurements and enhancing the coincidence between form measurement and area determination processes.
Implementation Method 1
a form measuring apparatus which measures a form of an object by using a phase shifting technique
Implementation Method 2
projects a structured light having a sinusoidal intensity distribution onto a measuring object
Implementation Method 3
irradiating a reference light onto the measuring object, and detecting a target area for the form measurement from pickup images taken by imaging the measuring object irradiated with the reference light
Data Source
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AI summary
It is possible to improve a measurement efficiency of a form measuring apparatus. There is provided a form measuring apparatus including: an imager configured to take an image of a object, an irradiator configured to irradiate a measurement light from a projection direction different from the direction along which the imager performs imaging to form a predetermined light amount distribution on the object, a reference light generator configured to generate a reference light to irradiate the object, and a detector configured to detect a target area for form measurement of the object based on a pickup image taken by the imager as the reference light is irradiated on the object.