Additive Manufacturing Fill-Level Sensing With Inert-Gas Pressure

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Solution Overview

Problem

Existing measurement techniques for determining the fill level of collection containers in additive manufacturing apparatuses, such as weighing and optical sensors, introduce additional components and require frequent cleaning, and are limited by field of view, necessitating improved contactless measurement methods.

Innovation Solution

A fill level sensor using the ideal gas law to calculate the volume of particulates or build material in a collection container by measuring pressure change and temperature, without physical contact, utilizing inert gas to determine fill level percentage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If weighing scales are used to measure fill level, then measurement can be obtained, but additional components are introduced and cleaning is required frequently

Engineering Contradiction:

Improvefill level measurementVSAvoidadditional components

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the measurement function from physical contact with the collection container by using a pressure sensor that measures fill level through pressure changes in the gas above the particulate material. This eliminates the need for weighing scales and their associated mechanical components, directly resolving the contradiction between measurement capability and device complexity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces gas pressure as an intermediary medium to transmit information about the fill level from the collection container to the sensor. Instead of direct contact between the sensor and particulate material, the gas pressure acts as a mediator that conveys fill level information, thereby reducing device complexity while maintaining measurement precision

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If optical sensors are used to measure fill level, then measurement can be obtained, but they are limited by field of view and require frequent cleaning

Engineering Contradiction:

Improvefill level measurementVSAvoidcontamination and cleaning requirements

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent uses gas pressure as an intermediary that allows remote measurement without direct exposure of the sensor to the particulate material. The pressure sensor measures the pressure of the gas above the material, which indirectly reflects the fill level, thereby eliminating the need for optical sensors that would require frequent cleaning and are limited by field of view

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces optical sensing mechanisms with a pressure-based mechanical sensing approach. Instead of using light that requires clear optical paths and frequent cleaning, the system uses pressure changes in the gas phase to determine fill level, eliminating the harmful effects of contamination on the sensor

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If contact sensors are used to measure fill level, then measurement can be obtained, but contamination risk increases and cleaning frequency increases

Engineering Contradiction:

Improvefill level measurementVSAvoidcontamination resistance

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent extracts the sensor from direct contact with the particulate material by measuring pressure changes in the gas phase above the material. This spatial separation eliminates contamination risk while maintaining measurement precision, directly resolving the contradiction between measurement capability and reliability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The gas pressure serves as an intermediary that transmits fill level information without requiring the sensor to contact the particulate material. This intermediary approach protects the sensor from contamination while maintaining reliable and precise measurements

Inventive Principle:

Principle #24Intermediary (Mediator)

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 contactless determination of fill level, reducing contamination risk and cleaning frequency, and is compatible with existing additive manufacturing systems by leveraging existing pressure and volume flow gauges.

Implementation Method 1

The fill level sensor utilizes the ideal gas law to calculate the powder or particulate volume in the collection container, which has a known volume, when filled with a known amount of gas by measuring the pressure change and gas temperature

Methodology Applied

Scientific EffectIdeal gas law: Boyle's Law

Implementation Method 2

measuring the pressure change and gas temperature

Methodology Applied

Scientific EffectTemperature measurement:

Data Source

PatentUS12429367B1Fill level sensing devices and additive manufacturing apparatuses including same

Publication Date: 2025.09.30 CONCEPT LASER

AI summary

Disclosed herein are particulate separation systems including a filter device that separates particulates from a particulate-laden stream generated by an additive manufacturing apparatus. A collection container is also included which is fluidly connected to the filter device and receives the particulates separated from the particulate-laden stream. A fill level sensor is further included which is fluidly connected to the collection container and detects a pressure change from displacement of an inert gas by the particulates received in the collection container.