Fiber Optical Fabry-Perot Flow Test Device with Local Bending Diversion Structure

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing fiber optical flow test technologies face challenges in high-temperature and high-pressure environments due to temperature cross-sensitivity, which affects the accuracy of flow tests.

Innovation Solution

A fiber optical Fabry-Perot flow test device with a local bending diversion structure, featuring fiber optical Fabry-Perot pressure sensors on both sides of an arc-shaped test tube, connected through circulators and CCD cameras for demodulation, and packaged with laser welding to minimize temperature-induced errors, calculates fluid flow using absolute phase differences.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If fiber bragg grating sensing technology is used for flow tests, then flow tests can be realized, but temperature cross-sensitivity impacts measurement precision

Engineering Contradiction:

Improveflow test accuracyVSAvoidtemperature cross-sensitivity

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The test tube is segmented into a straight section and an arc-shaped section, with sensors positioned at specific locations. The arc-shaped section creates distinct high-pressure and low-pressure zones that can be measured separately by different sensors, allowing differential measurement that eliminates temperature cross-sensitivity effects.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The arc-shaped section acts as an intermediary structure that transforms the flow measurement problem into a differential pressure measurement problem. By creating pressure differences through the arc geometry, the system can measure flow indirectly while using differential sensing to cancel out temperature effects.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If sensors are inserted into the pipe for flow testing, then direct measurement is achieved, but device complexity and temperature interference increase

Engineering Contradiction:

Improvedirect measurement capabilityVSAvoidsensor insertion structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The sensors are extracted from the pipe interior and positioned on the outer surface of the test tube. The arc-shaped test tube structure allows sensors to be placed on the exterior while still measuring internal flow characteristics through the pressure differences created by the arc geometry, simplifying the overall device structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The measurement approach transitions from one-dimensional internal sensor insertion to two-dimensional external sensing. Sensors are positioned on the outer surface of the test tube at different angular positions around the arc, enabling flow measurement without penetrating the pipe interior.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Productivity

If conventional pressure-type flow test methods are used, then flow tests can be performed, but temperature cross-sensitivity reduces measurement accuracy

Engineering Contradiction:

Improveflow test capabilityVSAvoidaccuracy in high-temperature environment

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The test tube incorporates an asymmetric arc-shaped section that creates unequal pressure distributions on different sides. This asymmetric geometry generates distinct high-pressure and low-pressure zones that can be measured differentially, allowing the system to maintain productivity while improving accuracy through temperature-compensated differential measurement.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The system changes the measurement parameter from absolute pressure to differential pressure. By measuring the pressure difference between high-pressure and low-pressure sides rather than absolute pressure at a single point, the system maintains flow test capability while eliminating temperature cross-sensitivity effects.

Inventive Principle:

Principle #35Parameter changes

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 solution effectively reduces temperature cross-sensitivity and improves the accuracy of flow tests by avoiding sensor insertion into the pipe and using a differential pressure asymmetric double-sensor structure, enhancing measurement precision in harsh environments.

Implementation Method 1

fiber optical Fabry-Perot pressure sensor

Methodology Applied

Scientific EffectFabry-Perot interferometer: Fabry-Perot Interferometer

Implementation Method 2

demodulation of an fiber optical Fabry-Perot pressure sensor synchronously to an absolute phase difference

Methodology Applied

Scientific EffectOptical path difference:

Implementation Method 3

fiber optical Fabry-Perot pressure sensor at high-pressure-side and a fiber optical Fabry-Perot pressure sensor at low-pressure-side

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Data Source

PatentUS10508938B2Fiber optical fabry-perot flow test device and test method with local bending diversion structure

Publication Date: 2019.12.17 TIANJIN UNIV

AI summary

Fiber optical Fabry-Perot flow test device with local bending diversion structure, having an inlet flange, a test tube and an outlet flange, with both a fiber optical Fabry-Perot pressure sensor at high-pressure-side and a fiber optical Fabry-Perot pressure sensor at low-pressure-side, which are fixedly connected to the test tube through an auxiliary connecting device.