Optical Lens Temperature Control for 3D Measurement Focus Stability
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Solution Overview
Problem
The focus positions of light projection and receiving lenses in three-dimensional measurement devices change with temperature, affecting the measurement range and making it challenging to maintain a large measurement range within a specified temperature range.
Innovation Solution
An optical assembly for a three-dimensional measurement device is proposed, which includes an optical lens, an optical device, a temperature sensor, a heater, and a control part. The control part maintains the optical lens at a constant temperature, preventing focus position changes and ensuring the optical device remains at the focus position, thereby securing a wide measurement range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the optical lens operates without temperature control, then the device complexity is reduced, but the focus position changes with temperature causing the measurement range to become narrow
Solution Approach 1:
The patent applies temperature control to maintain the optical lens at a constant temperature, preventing focus position drift caused by temperature changes. This parameter control ensures the measurement range remains stable and reliable without requiring complex mechanical adjustments
Solution Approach 2:
The patent implements a feedback control system where temperature sensors monitor the lens temperature and control systems adjust heating or cooling to maintain the lens at its optimal operating temperature. This closed-loop feedback ensures consistent focus position and measurement range
2Reliability
If temperature control is implemented for the optical lens, then the measurement range is maintained, but the device complexity increases due to additional components
Solution Approach 1:
The patent introduces temperature sensors and control systems as intermediary components between the optical lens and the environment. These intermediaries monitor and regulate temperature to prevent focus drift, maintaining measurement range without requiring direct mechanical intervention in the optical path
Solution Approach 2:
The patent controls the temperature parameter of the optical lens to remain constant, preventing the focus position from changing with temperature. This single parameter control approach maintains reliability while minimizing the addition of complex mechanical subsystems
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 configuration effectively prevents focus position changes due to temperature fluctuations, ensuring the optical device remains at the correct position, and thus secures a wide measurement range within a specified temperature range.
Implementation Method 1
the heater is for heating the optical lens
Implementation Method 2
The temperature sensor is for detecting a temperature of the optical lens
Data Source
AI summary
An optical assembly (13) for a three-dimensional measurement device is equipped with: an optical lens (320) that forms a pair of conjugate planes having an optically conjugate relationship; an optical device (341) that is disposed on one of the pair of conjugate planes; a temperature sensor (354) for detecting the temperature of the optical lens (320); a heater (350) for heating the optical lens (320); and a control part that controls the operation of the heater (350) on the basis of the result of the detection made by the temperature sensor (354) such that the optical lens (320) reaches a constant temperature.