Angled Sample Holder for Integrating Sphere Light Measurement
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Solution Overview
Problem
Conventional integrating spheres fail to accurately measure light intensity from samples due to excitation light interference, where generated light returns to the excitation light introducing hole, affecting measurement accuracy.
Innovation Solution
A photodetecting device with a sample holder that can be angled relative to the excitation light optical axis, equipped with a locking mechanism and buffering members to securely hold the cell, preventing measured light from returning to the excitation light introducing hole, and a jig for adjusting the cell's position to optimize light measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cell is positioned perpendicular to the excitation light optical axis for easy alignment, then the device operation is simplified, but the measured light returns to the excitation light introducing hole causing measurement inaccuracy
Solution Approach 1:
The cell is positioned at an asymmetric angle (45 degrees) relative to the excitation light optical axis rather than perpendicular. This asymmetric positioning prevents the measured light from returning to the excitation light introducing hole while maintaining straightforward alignment procedures through the angled mounting configuration.
2Stability of the object's composition
If the cell is held firmly without buffering members for secure positioning, then the positioning stability is improved, but the cell may be damaged during attachment
Solution Approach 1:
Buffering members are provided at the contact portions where the sample holder attaches to the cell. These buffering members cushion the cell during attachment, preventing damage while ensuring stable positioning of the cell in the sample holder.
3Ease of operation
If the sample holder is removably attached to allow easy replacement, then the ease of operation is improved, but the positioning precision may be compromised
Solution Approach 1:
The sample holder is pre-formed with a fitting shape that corresponds to the introducing hole of the integrating sphere. This preliminary shaping ensures that when the sample holder is attached and removed, it maintains consistent and precise positioning each time, combining ease of replacement with positioning accuracy.
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 configuration ensures accurate measurement of light intensity from samples by preventing interference, enhancing the precision of light measurement data obtained from the integrating sphere.
Implementation Method 1
A high-diffuse reflecting powder is coated on a spherical main body inner wall of the integrating sphere, and when the light to be measured is generated radially, it is multiply diffused and reflected by the high-diffusion reflecting powder.
Implementation Method 2
This diffuse-reflected light enters a photodetector, and an output signal of the photodetector is led to a light intensity meter
Data Source
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AI summary
A photodetecting device 1 includes an integrating sphere 20 for observing light to be measured generated according to irradiation of a sample with excitation light and a sample holder 60 removably attached to the integrating sphere 20, the integrating sphere 20 has an excitation light introducing hole 201 for introducing the excitation light and a sample introducing hole 205 for introducing a cell C held by the sample holder 60, the sample holder 60 is locked to the sample introducing hole 205 and holds the cell C for accommodating the sample, and the cell is disposed so that an entrance surface of the cell C, through which the excitation light enters the cell C, inclines relative to the surface perpendicular to the optical axis L of the excitation light.