Movable Window Optical Transmission Cell for Fluid Analysis

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Solution Overview

Problem

Existing optical transmission analysis apparatuses face challenges in efficiently cleaning small transmission cells, particularly when dealing with viscous or dirty fluids like lubricating oils, which requires significant time and can lead to contamination in subsequent measurements due to the small path lengths involved.

Innovation Solution

A sample testing apparatus with a movable window that can be positioned within the transmission cell to facilitate cleaning by moving in and out of the test region, reducing the need for separate cleaning steps and allowing for fluid exchange, thereby simplifying the cleaning process and reducing contamination risks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a small path length transmission cell is used for liquid analysis, then the measurement is suitable for infrared radiation and liquid samples with strong absorption, but the cleaning process becomes time-consuming and contamination risk increases

Engineering Contradiction:
Improveoptical path length controlVSAvoidcleaning time
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies the dynamics principle by making the window movable rather than fixed. The window can be positioned in different locations including outside the test region, enabling automated cleaning operations without manual disassembly. This dynamic structure allows the system to switch between measurement mode (window in test region) and cleaning mode (window moved to cleaning position), resolving the contradiction between maintaining small path length for accurate measurement and enabling efficient cleaning.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent implements self-service by enabling the transmission cell to clean itself through automated window movement and fluid exchange mechanisms. The movable window can be positioned to allow cleaning fluids to flush through the cell, and the system can automatically exchange samples without requiring manual disassembly or extensive cleaning procedures, thus reducing cleaning time while maintaining measurement precision.

Inventive Principle:
Principle #25Self-service

2Measurement precision

If a small path length transmission cell is used, then the analysis is appropriate for liquid samples with strong absorption properties, but contamination from previous tests significantly affects subsequent measurements

Engineering Contradiction:
Improveoptical path lengthVSAvoidmeasurement accuracy
Core Design Contradiction:
Measurement precisionVSReliability

Solution Approach 1:

The movable window design enables dynamic positioning to facilitate thorough cleaning between measurements. By moving the window to specific positions, the system allows cleaning fluids to effectively reach and flush all sample-contacting surfaces, ensuring complete removal of contaminants while maintaining the precise small path length geometry needed for accurate infrared analysis of liquids.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent applies the extraction principle by removing the window from its fixed position within the test region during cleaning operations. By extracting or moving the window to a different location, the system enables access to previously inaccessible areas for cleaning, ensuring complete contamination removal while preserving the precise optical path length when the window is returned to its measurement position.

Inventive Principle:
Principle #2Taking out (Extraction)

3Reliability

If manual cleaning procedures are used for the transmission cell, then thorough cleaning can be achieved, but the process takes considerable time greater than measurement time

Engineering Contradiction:
Improvecleaning effectivenessVSAvoidtesting throughput
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The patent implements self-service by automating the cleaning process through programmable window movement and fluid exchange systems. The transmission cell can automatically perform thorough cleaning operations by moving the window to various positions and flushing with cleaning fluids, achieving reliable contamination removal without requiring time-consuming manual disassembly and cleaning procedures, thus maintaining high testing throughput.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The system performs preliminary cleaning actions automatically between measurements by moving the window to cleaning positions and flushing with cleaning fluids before the next measurement begins. This preliminary automated cleaning ensures thorough contamination removal is completed in advance, eliminating the need for time-consuming manual cleaning procedures and maintaining high productivity.

Inventive Principle:
Principle #10Preliminary action

4Manufacturing precision

If the transmission cell has small dimensions, then it provides well-defined path length for optical analysis, but difficulties arise in introducing fluid to be tested and in cleaning

Engineering Contradiction:
Improvepath length definitionVSAvoidfluid introduction and cleaning
Core Design Contradiction:
Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent applies dynamics by making the window movable rather than fixed. This allows the window to be positioned in different locations including outside the test region, enabling automated fluid exchange and cleaning operations. The dynamic structure facilitates easy introduction of test fluids and thorough cleaning of the small-dimensional cell while maintaining the precisely defined path length geometry required for accurate optical analysis.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The movable window serves multiple functions: it defines the optical path length for measurement, enables fluid introduction, and facilitates cleaning operations. By making the window multi-functional through its ability to move to different positions, the system achieves ease of operation for fluid handling and cleaning while maintaining the precise small dimensions needed for well-defined path length in infrared analysis.

Inventive Principle:
Principle #6Universality (Multi-functionality)

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

The apparatus enables efficient cleaning and fluid renewal within the transmission cell, minimizing the time required for cleaning and preventing contamination, making it suitable for both extracted and online testing, especially in field applications where quick and simple cleaning is essential.

Implementation Method 1

electromagnetic radiation may be introduced through the window into the transmission cell in use for detection after passing through the sample

Methodology Applied
Scientific EffectElectromagnetic radiation transmission: Light

Implementation Method 2

the apparatus is operable to cause the first movable window to move with respect to the first and second fixed walls to move at least a portion of the first movable window into and out of a test region

Methodology Applied
Scientific EffectFluid flow induced by window movement: Convection

Data Source

PatentEP3365658B1Sample testing apparatus and method
Publication Date: 2022.08.17 PARKER HANNIFIN MFG LTD
  • EP3365658B1 patent drawingFigure 1
  • EP3365658B1 patent drawingFigure 2
  • EP3365658B1 patent drawingFigure 3

AI summary

A sample testing apparatus is disclosed for use in optical transmission analysis of fluid samples such as oils or engine oils. The apparatus comprises a transmission cell comprising first and second fixed walls (1,2) and a movable window (3) that is moved with respect to the first and second walls in and out of a test region (6). When the movable window (3) is moved into the test region (6) an optical path through a fluid sample in the cell is defined, the optical path through the sample comprising a portion extending through the or each gap (L1,L2) between a one of the first and second fixed walls (1,2) and the at least a portion of the first movable window (3). Also disclosed are methods of using the sample testing apparatus and methods of performing a measurement for use in optical transmission analysis of a fluid sample.