Atomic Absorption Spectrophotometer Frequency-Adaptive Control
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Solution Overview
Problem
The existing atomic absorption spectrophotometers using a double beam optical system face challenges in maintaining optimal lowest detection limit performance due to variations in alternating current power frequency, leading to increased statistical errors and reduced data quality.
Innovation Solution
An atomic absorption spectrophotometer with a light source controller and sampling data extractor that adjust the lighting period and extraction period based on the AC power frequency, ensuring optimal performance independent of the frequency, using a microcomputer chip to set and adjust these parameters for optimal data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lighting period and extraction period are fixed, then the device operation is simple, but the measurement precision deteriorates due to AC power frequency variations
Solution Approach 1:
The patent applies dynamics by making the lighting period and extraction period adjustable parameters that can be optimized based on AC power frequency conditions. The light source controller and sampling data extractor are configured to dynamically adapt their operating parameters to maintain optimal measurement precision under varying frequency conditions, resolving the contradiction between operational simplicity and measurement precision.
Solution Approach 2:
The patent changes the parameters of lighting period and extraction period to optimize measurement precision. By adjusting these temporal parameters in response to AC power frequency variations, the system maintains optimal detection limits without requiring complex operational procedures, thus resolving the contradiction between ease of operation and measurement precision.
2Measurement precision
If the lighting period is extended to reduce statistical errors, then the measurement precision improves, but the productivity decreases due to longer measurement cycles
Solution Approach 1:
The patent employs periodic action by synchronizing the lighting period and extraction period with the sector mirror rotation cycle. This periodic synchronization allows the system to collect sufficient data for high precision measurements while maintaining efficient measurement cycles, thereby resolving the contradiction between reducing statistical errors and maintaining productivity.
Solution Approach 2:
The patent ensures continuity of useful action by coordinating the light source operation and data extraction with the continuous rotation of the sector mirror. This continuous synchronized operation maximizes data collection efficiency during each measurement cycle, improving precision without sacrificing productivity.
3Measurement precision
If the light source is continuously ON to maximize data collection, then the measurement precision improves, but the energy consumption increases
Solution Approach 1:
The patent applies periodic action by turning the light source ON and OFF in synchronization with the sector mirror rotation. The light source is activated only during the extraction period when data collection is required, and remains OFF during other periods. This periodic operation maintains high measurement precision while significantly reducing energy consumption compared to continuous operation.
4Measurement precision
If the extraction period is extended to improve data quality, then the measurement precision improves, but the time required for each measurement increases
Solution Approach 1:
The patent uses periodic action by synchronizing the extraction period with the sector mirror rotation cycle. This synchronization ensures that data extraction occurs at optimal intervals, collecting sufficient high-quality data within each rotation cycle. The periodic timing optimizes the balance between data quality and measurement cycle time, improving precision without excessive time loss.
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 ensures consistent optimal lowest detection limit performance by synchronizing the lighting period and data extraction with the sector mirror rotation, reducing statistical errors and maintaining data quality across different AC power frequencies.
Implementation Method 1
a hollow cathode (HC) lamp 11 which is a light source for emitting a light having a bright-line spectrum
Implementation Method 2
a deuterium (D2) lamp 12 which is a light source for emitting a light having a continuous spectrum
Implementation Method 3
an atomization unit 18 for atomizing a sample
Implementation Method 4
a spectroscope 30 for separating the light sent from the sector mirror 21
Implementation Method 5
a detector 36 for detecting the intensity of the separated light
Implementation Method 6
a half mirror 13 for dividing the light emitted from each lamp into two directions
Implementation Method 7
a sector mirror 21 for sending each light divided by the half mirror 13 to the same optical path
Data Source
AI summary
The present invention has been accomplished to provide an atomic absorption spectrophotometer capable of obtaining measurement data always in the state where the lowest detection limit performance is optimized, without depending on the frequency of the power supply. In a control program which runs on the microcomputer chip 42 mounted on the atomic absorption spectrophotometer 110, a plurality of lighting periods of the light sources 11 and 12 and extraction periods of the sampling data are memorized, whose lowest detection limit performance are optimized for the frequencies (50 Hz and 60 Hz) of the AC power source for driving the AC motor 22. In using the apparatus, by the control program, the frequency of the power source used in this apparatus is identified, the lighting period and sampling data extraction period corresponding to the identified frequency and the measurement mode that a user of the apparatus has previously set are selected from among a plurality of memorized values, and the appropriate lighting period is set to the hardware (PLD 43). Accordingly, without depending on the frequency, it is possible to obtain measurement data always in the state where the lowest detection limit performance is optimized.