Optical Outer Diameter Measurement Apparatus Airflow Stabilization
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Solution Overview
Problem
Air disturbances caused by the rotation of a rotary mirror and heat from a motor in optical outer diameter measurement apparatuses can lead to decreased measurement precision due to disruptions in the optical path.
Innovation Solution
The apparatus includes a housing with an optical-path cover featuring two walls extending in the scanning direction to minimize air disturbances, and a heat dissipation plate with higher thermal conductivity to manage heat from the motor, ensuring improved measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rotary mirror is used to convert light into scanning light, then the optical measurement function is achieved, but air disturbance occurs due to rotation and motor heat, decreasing measurement precision
Solution Approach 1:
A cover structure is introduced as an intermediary element between the rotary mirror and the optical path. This cover acts as a mediator that blocks air disturbance from reaching the optical path while allowing the rotary mirror to continue its rotation function, thus resolving the contradiction between achieving optical measurement and preventing air disturbance
Solution Approach 2:
The cover creates a protected environment around the optical path, effectively isolating it from the disturbed air caused by rotary mirror rotation. This establishes an 'inert' optical environment where air disturbance is excluded, allowing precise measurements to be taken despite the rotating components operating nearby
2Measurement precision
If a motor is used to rotate the rotary mirror, then scanning light generation is achieved, but heat from the motor disturbs the optical path, decreasing measurement precision
Solution Approach 1:
The cover serves as a thermal barrier and intermediary structure that prevents motor-generated heat from directly affecting the optical path. It mediates between the heat-generating motor and the temperature-sensitive optical components, protecting the measurement system from thermal disturbance
Solution Approach 2:
The cover effectively extracts or removes the harmful thermal effect from the optical path environment. By creating a separate enclosed space, it extracts the heat problem from the measurement zone, allowing the motor to operate without compromising optical path stability
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 solution effectively reduces air disturbances and heat-related issues, resulting in enhanced measurement precision and accuracy by stabilizing the optical path and dissipating motor heat efficiently.
Implementation Method 1
a collimator lens configured to convert the scanning light into parallel scanning light
Implementation Method 2
a condenser lens configured to condense the parallel scanning light
Implementation Method 3
a heat dissipation plate having a thermal conductivity less than a thermal conductivity of the housing, the heat dissipation plate being thermally connected to the motor
Data Source
AI summary
An optical outer diameter measurement apparatus includes a rotary device driven to rotate by a motor to convert light emitted from a light-emitting element into scanning light, a collimator lens configured to convert the scanning light into parallel scanning light that is projected toward an object to be measured, a condenser lens configured to condense the parallel scanning light having passed by the object to be measured, a light-receiving element configured to receive light condensed by the condenser lens, a housing that accommodates the rotary device and the collimator lens, and an optical-path cover including, in the housing, two walls extending in a scanning direction of the scanning light and located opposite each other with the scanning light between the two walls.