The C-T (Czerny-Turner) structure is very common in the field of spectral analysis, mainly comprising two forms: the crossed type and the symmetric type. Here is a detailed analysis of these two forms:
Crossed C-T Structure
1. Structural Characteristics
● Folded Light Path: The crossed C-T structure uses two plane mirrors to fold the light path, making the spectrometer more compact.
● Space Utilization: Due to the folded light path design, the crossed C-T structure has higher space utilization, allowing the spectrometer to perform more functions in a smaller volume.
2. Technical Characteristics
● Sensitivity: The crossed C-T structure typically has high sensitivity, capable of capturing weak light signals.
● Adjustability: This structure allows users to replace components such as slits, gratings, sensors, and filters as needed to configure the spectrometer parameters, such as resolution, wavelength range, signal-to-noise ratio, and stray light.
3. Advantages and Disadvantages
● Advantages:
Compact structure, small footprint.
Flexible parameter configuration as needed.
High sensitivity.
● Disadvantages:
Potential issues with aberrations and stray light due to the folded light path, affecting measurement accuracy.
4. Applications
The crossed C-T structure is widely used in spectroscopic measurements requiring high sensitivity, fast response, and portability, such as environmental monitoring, food safety testing, and biomedical research.
Symmetric C-T Structure (commonly referred to as M-type Structure)
1. Structural Characteristics
● Straight Light Path: The symmetric C-T structure (M-type) uses a straight light path design without folding.
● Shape: Named the M-type structure because its shape resembles the letter "M".
2. Technical Characteristics
● High Resolution: The M-type structure can achieve high spectral resolution through optimized light path design, meeting high requirements for spectral details.
● Stray Light Performance: The M-type structure excels in stray light suppression, which improves measurement accuracy.
3. Advantages and Disadvantages
● Advantages:
High resolution, suitable for precise spectral analysis.
Better stray light performance, improving measurement accuracy.
● Disadvantages:
Relatively lage volume, lower space utilization.
Higher cost.
4. Applications
The M-type structure is often used in applications requiring high spectral resolution, such as materials science research and spectral imaging.
In summary, the crossed C-T structure is widely used in various portable and fast-response scenarios due to its compact structure and high sensitivity. In contrast, the symmetric C-T structure (M-type) holds an important position in the field of spectral analysis due to its high resolution and low stray light performance. When choosing a fiber optic spectrometer, it is necessary to select the appropriate structure type based on specific application needs.
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Post time: Jul-03-2024