Distance Measurement Calibration via Temperature Compensation
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Solution Overview
Problem
Distance-measuring devices are affected by background light and flicker phenomena, leading to incorrect distance calculations, and assembly errors during fabrication further deteriorate accuracy, causing inconvenience.
Innovation Solution
The method involves a distance-measuring device with a lighting component, a first lens, and an image sensor, which includes a temperature sensor and a temperature compensation calculating circuit to calculate a calibrated imaging location and measured distance based on ambient temperature, reducing the impact of background light and assembly errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distance measurement is performed using imaging location variation, then distance calculation is achieved, but measurement precision deteriorates due to background light and flicker effects
Solution Approach 1:
The patent applies periodic action by synchronizing the lighting component's emission with the image sensor's detection cycles. The lighting component emits detecting light in periodic pulses that are synchronized with the image sensor's exposure timing, allowing the system to distinguish between reflecting light from the measured object and background light. This periodic synchronization eliminates interference from background light and flicker effects, thereby improving distance measurement accuracy.
2Measurement precision
If distance measurement is performed using imaging location variation, then distance calculation is achieved, but measurement precision deteriorates due to assembly errors
Solution Approach 1:
The patent applies parameter changes by introducing temperature as a compensation parameter. The temperature sensor detects ambient temperature variations, and the processing circuit adjusts the imaging location calculation based on the relationship between temperature and imaging location. This compensation mechanism corrects for assembly errors that cause imaging location shifts, thereby maintaining measurement precision across different operating conditions.
3Measurement precision
If temperature compensation is implemented, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent introduces a temperature sensor as an intermediary element that mediates between the ambient temperature and the imaging location calculation. The temperature sensor provides temperature data to the processing circuit, which then uses this information to compensate for imaging location variations. This intermediary approach enables temperature compensation without requiring complex mechanical or optical adjustments, thus improving measurement precision while maintaining relatively simple device structure.
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 approach enhances the accuracy of distance measurements by compensating for ambient temperature variations and assembly errors, thereby improving the reliability of the distance-measuring device.
Implementation Method 1
providing a temperature sensor for measuring the ambient temperature of the distance-measuring device
Implementation Method 2
The reflective light is focused by the first lens on the image sensor so that the measured object forms an image at a first imaging location
Data Source
AI summary
A calibrating method of calibrating a measured distance of a measured object measured by a distance-measuring device according to an ambient temperature includes providing a temperature sensor for measuring the ambient temperature of the distance-measuring device, calculating a calibrated imaging location of the measured object according to the ambient temperature and an imaging location of the measured object, and calibrating the measured distance according to the calibrated imaging location. In this way, when the distance-measuring device measures the measured object, the error due to the variation of the ambient temperature is avoided according to the calibrating method.