Transmissive Sampling Module Lens Group for Uniform Light Spot
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Solution Overview
Problem
Conventional transmissive spectrometers face issues with non-uniform light spots and high variability in measurement results due to elongated and inclined light spots, which complicates alignment and increases measurement variability, especially when measuring objects with different refractive indexes, and require complex and costly setups with multiple optical fiber connections.
Innovation Solution
A transmissive sampling module with a lens group having positive refractive power, comprising a first and second lens, is designed to emit a uniform and large coverage light spot, eliminating the need for optical fiber connections by integrating the light emitting element and holder, ensuring accurate and stable measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lens group is used to focus the sample beam, then the light spot is formed toward the slit, but the light spot becomes elongated and inclined, making alignment difficult and reducing measurement accuracy
Solution Approach 1:
The lens group is divided into multiple lenses (first lens, second lens, third lens) with different functions. The first lens focuses the beam, the second lens corrects the inclination, and the third lens ensures uniform energy distribution. This segmentation allows each lens to address specific alignment issues independently, resolving the contradiction between forming a focused light spot and maintaining proper alignment.
Solution Approach 2:
Each lens in the group is designed with specific optical properties tailored to its function. The first lens has high focusing power, the second lens has specific inclination correction characteristics, and the third lens provides uniform energy distribution. This local optimization of optical quality at each stage resolves the alignment and accuracy contradictions.
2Reliability
If conventional optical fiber connections are used to connect light sources and sample holders, then the spectrometer can perform measurements, but the overall volume becomes overly large and manufacturing costs increase
Solution Approach 1:
The light emitting element, accommodation tank, and lens group are merged into a single integrated sampling module that attaches directly to the spectrometer body. This eliminates the need for separate optical fiber connections and sample holders, significantly reducing the overall volume while maintaining measurement capability.
Solution Approach 2:
The integrated sampling module serves multiple functions simultaneously: it houses the light source, contains the sample accommodation tank, provides optical focusing through the lens group, and enables direct coupling with the spectrometer. This multi-functionality eliminates the need for multiple separate components and connections, reducing volume and complexity.
3Reliability
If multiple components and optical fiber tubes are used for connections, then the spectrometer can be assembled, but the manufacturing costs become high and usage becomes complicated
Solution Approach 1:
Multiple separate components (light emitting element, accommodation tank, lens group) are merged into a single integrated sampling module. This reduces the number of parts from multiple discrete components to one unified assembly, simplifying manufacturing and usage while maintaining system reliability.
Solution Approach 2:
The complex assembly of multiple optical fiber connections and separate sample holders is extracted and replaced by a single integrated module that attaches directly to the spectrometer. This extraction of the complex connection system resolves the contradiction between reliable assembly and device complexity.
4Use of energy by moving object
If the light spot energy distribution is non-uniform, then the spectrometer receives uneven energy, but the variability of measurement results increases
Solution Approach 1:
The third lens in the sequence is specifically designed to provide uniform energy distribution across the light spot. This local optimization of energy distribution quality resolves the contradiction between receiving energy and maintaining measurement precision by ensuring even energy across the entire beam profile.
Solution Approach 2:
The energy distribution correction is achieved through segmentation of the optical path into distinct stages, with the third lens specifically tasked with uniformizing the energy distribution. This segmented approach allows targeted correction of energy non-uniformity without affecting the focusing and inclination correction functions of earlier lenses.
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
The solution provides high energy uniformity and large coverage, reducing measurement variability to less than 0.01 across different refractive indexes and simplifies the spectrometer design, making it more accurate and cost-effective while minimizing the overall volume.
Implementation Method 1
The lens group has a positive refractive power and an optical axis. Besides, the lens group sequentially includes a first lens and a second lens along the optical axis
Implementation Method 2
the lens group sequentially includes a first lens and a second lens along the optical axis arranged in a direction from the first side to the second side. The illumination beam is transmitted to the object after passing through the first lens
Data Source
AI summary
The transmissive sampling module includes a light emitting element, an accommodation tank, and a lens group having a positive refractive power. The light emitting element is configured to emit an illumination beam. The accommodation tank is configured to accommodate an object to be measured. The lens group includes a first lens and a second lens. The first lens and the second lens are respectively located at a first side and a second side of the accommodation tank. The accommodation tank is located between the first lens and the second lens. The illumination beam is transmitted to the object after passing through the first lens. The object converts the illumination beam into a sample beam. The sample beam is transmitted to a main body of the spectrometer after passing through the second lens. A transmissive spectrometer having a transmissive sampling module is also provided.