Imaging Device Test Chamber Air Curtain Thermal Isolation
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Solution Overview
Problem
Existing testing methods for imaging devices in autonomous vehicles face challenges in accurately assessing performance across a wide temperature range due to temperature-induced variations in optical targets, leading to unreliable sensor measurements.
Innovation Solution
A testing apparatus with a thermally isolated test chamber uses an air curtain to maintain constant optical target temperatures while varying the device under test's temperature, ensuring accurate and reliable measurements by isolating the device from temperature-dependent effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the optical target is exposed to varying temperatures during testing, then the imaging device can be tested across a wide temperature range, but the optical target's characteristics change leading to unreliable measurements
Solution Approach 1:
The test chamber is divided into two thermally independent zones: a first chamber for the optical target maintained at constant temperature, and a second chamber for the imaging device subjected to varying temperatures. This spatial segmentation allows independent temperature control of each component, enabling reliable measurements while testing across wide temperature ranges.
Solution Approach 2:
A movable partition wall with adjustable aperture acts as an intermediary between the two chambers. This partition allows optical signals to pass from the optical target to the imaging device while thermally isolating the two zones. The aperture can be adjusted to control the optical path while maintaining thermal separation.
2Measurement precision
If the optical target temperature is maintained constant while the imaging device temperature varies, then measurement reliability improves, but the device complexity increases due to additional thermal isolation mechanisms
Solution Approach 1:
Air curtains are used as a pneumatic thermal isolation mechanism between the two chambers. Streams of air are directed to create invisible barriers that prevent heat transfer while allowing optical signals to pass through. This provides effective thermal isolation without requiring complex physical barriers or vacuum systems.
Solution Approach 2:
The partition wall is designed as a movable structure with an adjustable aperture, providing flexible thermal and optical control. This movable partition can be positioned to create optimal thermal isolation while maintaining the necessary optical path, reducing the need for additional complex isolation 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
This approach allows for precise temperature control of imaging devices, enhancing their performance and reliability across a wide temperature range, thereby improving sensing capabilities in autonomous vehicles.
Implementation Method 1
an air curtain configured to thermally isolate the imaging device from the optical target
Data Source
AI summary
Provided are methods and apparatuses for testing imaging devices, which can include a testing apparatus a testing apparatus including a test chamber; a device receptacle inside the test chamber for holding a device under test; a target receptacle inside the test chamber for holding an optical target within a field of view of the device under test; a temperature controller configured to adjust a temperature proximate to the device receptacle; and an air curtain controller configured to generate an air curtain inside the test chamber between a location of the device receptacle and a location of the target receptacle, the air curtain thermally isolating the device receptacle from the target receptacle.