Oxygen Concentration Inspection in Bag Containers
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Solution Overview
Problem
Non-destructive inspection of oxygen concentration in bag-shaped containers filled with liquids is challenging due to varying thickness and soft material composition, which affects the accuracy of laser-based measurements.
Innovation Solution
A non-destructive inspection device that includes a transport unit with container holders, a tilting mechanism to maintain a constant gas phase thickness, and inert gas chambers on the laser emitting and receiving sections, along with a vibrator to disperse oxygen molecules, ensuring accurate oxygen concentration measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laser beam is transmitted to measure oxygen concentration in a bag-shaped container, then non-destructive inspection is achieved, but measurement accuracy deteriorates due to varying thickness of soft material
Solution Approach 1:
A transparent pressing member is introduced as an intermediary between the laser beam and the bag-shaped container. This pressing member transmits the laser beam while providing a reference transmission path through its uniform thickness, enabling accurate oxygen concentration measurement despite variations in container wall thickness
Solution Approach 2:
The thickness parameter of the transmission path is standardized by using a pressing member with constant thickness. This compensates for the varying thickness of the soft container material, maintaining measurement accuracy across different positions and containers
2Ease of operation
If the bag is hung vertically for inspection, then gravity causes the gas phase portion thickness to vary, but maintaining constant thickness requires complex positioning mechanisms
Solution Approach 1:
The mechanical complexity of positioning mechanisms is replaced by using a transparent pressing member that mechanically presses the bag to create a constant thickness region. The pressing member's rigid structure inherently maintains constant thickness without requiring complex control systems
Solution Approach 2:
The bag is pre-positioned and pressed by the transparent pressing member before laser measurement to create a standardized constant thickness region. This preliminary action ensures consistent measurement conditions are established prior to the actual oxygen concentration measurement
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 solution enables precise and stable measurement of oxygen concentration by maintaining a constant gas phase thickness and evenly dispersing oxygen molecules, enhancing measurement accuracy and reliability.
Implementation Method 1
a laser beam is transmitted to a gas phase portion on the top of a vial container and the amount of transmitted light is measured. In other words, the absorbance is detected to measure an oxygen concentration.
Implementation Method 2
The gravity of a hung bag leads to a small thickness of the gas phase portion in the upper part of the bag and reduces the horizontal section of the gas phase portion toward the end of the bag
Implementation Method 3
a tilting device that is disposed on the right and left of the inspection area of the transport path so as to press the bag-shaped container from both sides by means of a container pressing member
Data Source
AI summary
A laser emitting section 59A and a laser receiving section 59B for measuring an oxygen concentration are provided on two sides of an inspection area so as to be moved toward and away from a bag-shaped container 1. Gas-filled chambers 61 provided on the end faces of the laser emitting section 59A and the laser receiving section 59B are brought into contact with the gas phase portion of the container 1 to keep a constant thickness of the gas phase portion. A tilting device 81 is provided to press the container 1, which is held by a container holder 16, from both sides with a container pressing member 88 and tilts the container 1 in a vertical plane. When an oxygen concentration is measured, the tilting device 81 tilts the bag-shaped container 1 to measure the gas phase portion at the shoulders of the container 1.