Independent Angle Adjustment for TOF Distance Measurement
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Solution Overview
Problem
Distance measurement apparatuses using the TOF method face accuracy issues due to asymmetric intensity distribution of reflected light, particularly in regions far from the sensor, when monitoring areas are irradiated with light at an oblique direction, leading to insufficient light intensity and reduced measurement accuracy.
Innovation Solution
A distance measurement apparatus with independently adjustable light emitting and receiving units, featuring a first rotation mechanism for adjusting the irradiation angle of the light emitting unit and a second rotation mechanism for adjusting the light receiving angle, ensuring optimal angle combinations to equalize reflection intensity across the monitoring area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the monitoring area is wide and light is irradiated in an oblique direction, then the coverage area is increased, but the reflected light intensity becomes asymmetric and insufficient in regions far from the sensor
Solution Approach 1:
The patent applies dynamics by making the light emitting unit and light receiving unit independently adjustable in their angles. The light emitting unit can change its irradiation angle separately from the light receiving angle, allowing dynamic optimization of light distribution across the monitoring area to ensure sufficient reflected light intensity even in wide coverage scenarios
Solution Approach 2:
The patent changes the angular parameters of the light emitting and receiving units independently. By adjusting the irradiation angle and light receiving angle as separate variables, the system can optimize the light path and reflected light collection efficiency to maintain adequate intensity across the entire monitoring area
2Device complexity
If the light emitting unit and light receiving unit use fixed angles, then the device structure is simple, but the reflected light intensity distribution becomes asymmetric and measurement accuracy deteriorates
Solution Approach 1:
The patent transforms fixed-angle units into dynamically adjustable units. The light emitting unit and light receiving unit can independently change their angles, enabling the system to adapt to different monitoring scenarios and maintain optimal measurement accuracy without excessive structural complexity
Solution Approach 2:
The patent segments the angular adjustment functionality by providing independent rotation mechanisms for the light emitting unit and light receiving unit. This allows each unit to be optimized separately, with the light emitting unit controlling irradiation angle and the light receiving unit controlling reception angle, thereby improving measurement precision while keeping the overall device structure manageable
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 eliminates deviations in reflected light intensity, thereby securing accurate distance measurements over the entire monitoring area by optimizing the light emitting and receiving angles to enhance reflection intensity on both near and far sides.
Implementation Method 1
a light emitting unit that irradiates the subject with a light-source light from a light source; a light receiving unit that receives a reflected light reflected from the subject
Implementation Method 2
measuring a distance to a subject based on a time difference from the irradiation of the light-source light to the reception of the reflected light
Data Source
AI summary
A distance measurement apparatus 1 includes a light emitting unit 11 that irradiates a subject with a light-source light from a light source, a light receiving unit 12 that receives a reflected light from the subject, a distance calculation unit 13 that calculates a distance to the subject based on a time difference from the irradiation of the light-source light to the reception of the reflected light; and an image processing unit 20 that generates a distance image of the subject based on the calculated distance. Further, the apparatus includes a first rotation mechanism 14 that adjusts an irradiation angle of the light emitting unit and a second rotation mechanism 15 that adjusts a light receiving angle of the light receiving unit, in which the angles of the light emitting unit and the light receiving unit may be adjusted independently of each other.