Pressurized Test Chamber for Independent Distance Sensor Calibration
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Solution Overview
Problem
Existing test systems for non-contact distance-measuring devices under air pressure, such as ultrasonic sensors, face challenges in independently controlling distance and pressure, leading to difficulties in precise testing, especially when used in high-pressure applications like truck air bellows.
Innovation Solution
A platform with a test chamber, a distance-controlling reflection device, and an air supply device that allows independent control of distance and pressure, featuring a reflector inside the chamber and an air exchange system to maintain airtight conditions, enabling precise distance adjustments and pressure control above atmospheric pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the reflector is arranged on the piston shoulder outside the air bellow to change distance, then the test rig can be simpler, but the distance change cannot be independently controlled from pressure change
Solution Approach 1:
The system is divided into two independent control subsystems: one for distance control (motor-driven reflector positioning) and one for pressure control (air supply device). This segmentation allows each subsystem to operate independently without interfering with the other, resolving the contradiction between structural simplicity and independent control capability.
Solution Approach 2:
A motor-driven mechanism is introduced as an intermediary device to control the reflector position independently from the air bellow pressure system. This intermediary mechanism enables precise distance control while maintaining the simplicity of the overall test rig structure.
2Ease of operation
If the reflector is moved to control distance inside the air bellow, then independent distance control is achieved, but the system requires more complex components and integration
Solution Approach 1:
The reflector is designed to serve multiple functions: it acts as both the distance reference surface for ultrasonic measurement and the mounting surface for the motor-driven positioning mechanism. This multi-functionality reduces the need for additional separate components, thereby managing system complexity while enabling independent distance control.
Solution Approach 2:
The distance control mechanism (motor-driven system) is merged with the existing air bellow structure by mounting it on the piston shoulder inside the air bellow. This integration approach combines multiple functions into existing structural elements, reducing overall system complexity while achieving independent distance control.
3Ease of operation
If a modified test rig with airtight air tank is used, then independent pressure control is achieved, but manufacturing and homologation become time and cost consuming
Solution Approach 1:
The air bellow itself serves as the pressure-containing chamber, utilizing its inherent airtight structure designed for truck air suspension applications. This self-service approach eliminates the need for separate custom-manufactured pressure chambers, significantly reducing manufacturing time and cost while maintaining independent pressure control capability.
Solution Approach 2:
The air bellow is used for dual purposes: as the actual air suspension component to be tested and as the pressure-containing test chamber. This multi-functionality eliminates the need for separate test chamber manufacturing, reducing both time and cost while enabling independent pressure control.
4Ease of manufacture
If the original test rig is used, then manufacturing is simpler, but distance and pressure cannot be controlled independently or precisely
Solution Approach 1:
The manual or indirect distance control method is replaced with a motor-driven positioning system that provides precise, controlled movement of the reflector. This substitution maintains the simplicity of using the existing air bellow structure while dramatically improving distance control precision and independence from pressure changes.
Solution Approach 2:
The ultrasonic distance-measuring device provides real-time feedback on the distance between the transmitter and reflector, enabling precise control and verification of position. This feedback mechanism ensures measurement precision while maintaining the simplicity of the overall test rig manufacturing.
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
Enables precise and independent control of distance and pressure, enhancing the reliability and sensitivity of non-contact distance-measuring devices like ultrasonic sensors, particularly in high-pressure applications, with accuracy up to 0.1 mm and pressure up to 13 bar, improving safety and testing efficiency.
Implementation Method 1
The UHPS in operation makes use of the non-contact ultrasonic measuring principle, by which the ultrasonic sensor transmits a sound wave and detects an echo reflected from a reflector surface
Implementation Method 2
the ultrasonic sensor transmits a sound wave and detects an echo reflected from a reflector surface
Implementation Method 3
The air supply device is configured to generate pressure above atmospheric pressure inside the test chamber
Data Source
Figure 1
AI summary
The invention relates to a platform (100) for testing a non-contact distance-measuring device (6) under air pressure. The platform (100) comprises a test chamber (8), a non-contact distance-measuring device (6), a distance-controlling reflection device (14) having a reflector (9) arranged inside the test chamber (8), and an air supply device (13) configured to generate an above-atmospheric pressure inside the test chamber (8). The non-contact distance-measuring device (6) is configured to transmit a measuring signal to the reflector and receive a reflected signal inside the pressurized test chamber (8). The reflector (9) is configured to control the distance to the non-contact distance-measuring device (6), while the air supply device (13) is configured to control the air pressure inside the test chamber (8), independently from the position of the reflector (9).