Charged Particle Beam Filament Lifetime Management
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Solution Overview
Problem
The existing charged particle beam apparatuses face frequent filament breakage during long-time observation, leading to unexpected downtime and increased running costs due to the inaccurate estimation of filament lifetime and observation time.
Innovation Solution
The apparatus calculates the imaging time required to generate an observation image and estimates the remaining usable time of the filament, alerting the user when the imaging time exceeds the remaining usable time, allowing for optimal replacement and reducing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the filament is continuously operated during long-time observation, then the observation can proceed without interruption, but the filament is at high risk of breaking due to sublimation wear
Solution Approach 1:
The system performs preliminary actions by calculating the imaging time required for observation and estimating the filament's remaining usable time before observation begins. By comparing these time values in advance, the system determines whether the filament can withstand the intended observation duration, thereby preventing breakage during operation and enabling proactive filament replacement scheduling.
2Reliability
If the filament is replaced with a new filament before observation, then the filament breakage risk is eliminated, but more filaments are used causing increase in running cost
Solution Approach 1:
The system implements feedback by continuously monitoring the filament's usage history and calculating its remaining usable time based on accumulated operating hours. This feedback mechanism provides real-time information about filament condition, enabling the system to optimize replacement timing and avoid both premature replacement (wasting filaments) and operation beyond filament capacity (causing breakage).
Solution Approach 2:
The system changes the parameter of filament replacement strategy from fixed schedule or preventive replacement to dynamic, condition-based replacement. By calculating remaining usable time based on actual usage parameters (operating hours, imaging requirements), the system adapts the replacement timing to match actual filament condition, optimizing both reliability and cost efficiency.
3Ease of operation
If the allowable use time is set by user and compared with integrated use time, then the electron source replacement can be planned, but the allowable use time may not accurately reflect the actual filament life leading to unexpected breakage
Solution Approach 1:
The system performs self-service by automatically calculating the imaging time required for the intended observation and estimating the filament's remaining usable time based on its usage history. This eliminates the need for users to manually set arbitrary allowable use time values, as the system autonomously determines these parameters and provides accurate comparisons to guide replacement decisions.
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 prevents filament breakage during observation, reduces running costs, and improves operating efficiency by allowing for timely replacement and optimizing filament usage.
Implementation Method 1
when the charged particle beam source is electrons, a voltage is applied to both ends of the filament, and thus, thermal electrons generated when the filament is heated are used
Implementation Method 2
thermal electrons generated when the filament is heated are used
Data Source
AI summary
An object of the present invention is to reduce the possibility that a filament is broken during observation and a re-measurement is required, to reduce the running cost of an apparatus, and to improve the operating efficiency of the apparatus. The charged particle beam apparatus according to the present invention calculates an imaging time required to generate an observation image of a sample and estimates a remaining usable time of the filament, and when the imaging time is longer than the remaining usable time, presents the fact (see FIG. 3).