Laser Distance Measurement With Precalculated Focus Alignment
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Solution Overview
Problem
Existing measurement apparatuses face challenges in quickly adjusting the optical system to maintain efficient reception of reflected light due to deviations in focal position caused by object movement or geometry changes, leading to prolonged autofocus operations.
Innovation Solution
A measurement apparatus that includes a branching part to split laser beams into reference and measurement lights, a condensing part with movable lenses, and a control system to adjust focal positions based on calculated correspondences between lens positions and object distances, enabling rapid alignment of focal points without requiring separate setup or previous focus adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a condenser lens is used to focus measurement light onto the object to improve light reception efficiency, then the received light intensity of reflected light increases, but the focal position deviates due to object movement or geometry changes, causing received light intensity to decrease
Solution Approach 1:
The system pre-calculates and stores the correspondence between object distances and focal positions during the manufacturing process. When measuring, the control part directly retrieves the pre-calculated focal position corresponding to the measured distance, eliminating the need for time-consuming autofocus adjustments during actual measurement operations.
Solution Approach 2:
The patent replaces the traditional mechanical autofocus adjustment mechanism with a calculation-based system. The correspondence calculation part computes focal positions using pre-established relationships between distance and focal position, substituting physical trial-and-error adjustment with mathematical calculation for faster operation.
2Illumination intensity
If traditional autofocus operations are performed to adjust focal position deviations, then light reception efficiency is maintained, but measurement time is prolonged
Solution Approach 1:
The correspondence between object distances and focal positions is pre-calculated and stored in the system during manufacturing. During measurement operations, the control part directly retrieves the appropriate focal position based on the measured distance without performing time-consuming autofocus adjustments, thereby maintaining light reception efficiency while significantly reducing measurement time.
Solution Approach 2:
The system creates a lookup table or database of focal position correspondences for different object distances. Instead of performing real-time autofocus calculations or adjustments, the system copies the pre-determined focal position from the stored correspondence data, enabling rapid retrieval and application of the correct focal position.
3Illumination intensity
If the focal position of the condenser lens is adjusted to match the object position, then received light intensity increases, but the optical system requires complex autofocus operations
Solution Approach 1:
The patent replaces complex mechanical autofocus adjustment systems with a calculation-based approach. The correspondence calculation part computes focal positions using pre-established relationships between object distance and focal position, eliminating the need for complex mechanical adjustment mechanisms while maintaining accurate focus.
Solution Approach 2:
The system performs self-adjustment by automatically calculating and applying the correct focal position based on the measured object distance and pre-stored correspondence data. The control part autonomously retrieves and applies the appropriate focal position without requiring external intervention or complex adjustment mechanisms.
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 efficiently adjusts focal positions to improve light reception and reduce measurement time by calculating and applying correspondences between lens positions and object distances, allowing for quick and sequential focusing on multiple locations.
Implementation Method 1
a condensing part that condenses the measurement light onto the object to be measured
Implementation Method 2
the received light intensity of the reflected light increases
Data Source
AI summary
A measurement apparatus includes a laser apparatus, a branching part that splits a laser beam into reference light and measurement light, a condensing part that condenses the measurement light onto an object to be measured, a control part that adjust a focal position where the condensing part condenses the measurement light, and a distance calculation part that calculates distance to the object to be measured on the basis of an optical path difference between the reference light and the measurement light, wherein the condensing part includes a first lens and a correspondence calculation part that calculates a correspondence between a focal position of the condensing part and a position of the first lens on the basis of a position of the first lens and a distance to the object to be measured.