Interference Spectrum Averaging for Low-Noise Electromagnetic Measurement
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Solution Overview
Problem
Existing techniques struggle to sufficiently reduce random noises in interference waveforms due to the short duration for phase fixation, leading to inefficient accumulation and the need for complex signal processing.
Innovation Solution
An electromagnetic wave measuring apparatus that acquires interference signals between post- and pre-irradiation electromagnetic waves with a differential frequency, accumulates and averages interference waveforms, and converts the frequency spectrum into an optical frequency spectrum without phase correction, using multiple accumulating and converting sections to reduce random noises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interference waveforms are accumulated to reduce random noises, then measurement precision is improved, but the short duration for phase fixation limits the number of accumulatable waveforms
Solution Approach 1:
The patent changes the reference electromagnetic wave repetition frequency to create a differential frequency with the pre-irradiation electromagnetic wave. This parameter change extends the fixed phase duration by ensuring that interference waveforms maintain phase coherence over a longer time period, allowing more waveforms to be accumulated for noise reduction.
Solution Approach 2:
The patent employs periodic interference waveforms generated by the differential frequency between the pre-irradiation and reference electromagnetic waves. This periodic structure allows for systematic accumulation of multiple waveforms while maintaining phase relationships, enabling extended accumulation beyond the original short fixed phase duration.
2Measurement precision
If every interference waveform is corrected in phase to enable accumulation, then measurement precision is improved, but complex signal processing is required
Solution Approach 1:
The patent performs preliminary action by setting the reference electromagnetic wave repetition frequency to create the differential frequency relationship before interference waveform generation. This preliminary configuration ensures that phase coherence is maintained inherently during waveform generation, eliminating the need for complex post-acquisition phase correction processing.
Solution Approach 2:
The patent replaces the complex mechanical signal processing system (time-domain to frequency-domain conversion, phase correction, and inverse conversion) with a simpler frequency-based approach. By using the differential frequency relationship between electromagnetic waves, phase coherence is achieved directly through frequency selection rather than complex processing operations.
3Measurement precision
If complex phase correction processing is applied to every interference waveform, then measurement precision is improved, but real-time processing capability is lost
Solution Approach 1:
The patent changes the operational approach from time-domain phase correction to frequency-domain parameter selection. By selecting the reference electromagnetic wave repetition frequency to create a specific differential frequency, phase accuracy is achieved through parameter configuration rather than computationally intensive real-time processing, thereby maintaining high productivity.
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
Effectively reduces random noises in interference waveforms by averaging and converting frequency spectra without phase correction, enabling efficient and real-time processing of high-speed interference waveforms.
Implementation Method 1
acquire an interference signal between a post-irradiation electromagnetic wave generated when an irradiation target having a measuring target is irradiated with a pre-irradiation electromagnetic wave and a reference electromagnetic wave
Data Source
AI summary
An electromagnetic wave measuring apparatus includes an interference signal acquiring section, an accumulating and averaging section, a frequency spectrum outputting section, an optical frequency spectrum converting section, and an optical frequency spectrum average outputting section. The interference signal acquiring section acquires an interference signal between a post-irradiation electromagnetic wave and a reference electromagnetic wave. The accumulating and averaging section accumulates interference waveforms, by a number of every one or more, that the interference signal has and outputs an averaged result of the accumulation. The frequency spectrum outputting section outputs a frequency spectrum of an output from the accumulating and averaging section. The optical frequency spectrum converting section converts the frequency spectrum into an optical frequency spectrum. The optical frequency spectrum average outputting section outputs an averaged result of the optical frequency spectrum.