Fluorescence excitation testing device

Abstract

The invention discloses a fluorescence excitation testing device. The fluorescence excitation testing device comprises a camera obscura used for light shielding, a sample tray which is arranged at the top of the camera obscura and used for placing a tested sample, a plurality of excitation light sources arranged at the bottom of the camera obscura, as well as an optical receiver which is arranged between the sample tray and the excitation light source and positioned in the middle of the camera obscura, wherein the bottom of the sample tray is transparent, the plurality of excitation light sources are symmetrically distributed at the bottom of the camera obscura and emit excitation light which irradiates onto the tested sample in the sample tray through the transparent bottom of the sample tray and excites the tested sample to emit excited light, and the optical receiver is used for collecting mixed light of the excitation light and the excited light. According to the fluorescence excitation testing device disclosed by the invention, measurement results are accurate and have very high reference values.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a fluorescence excitation test device. Background technique [0002] The fluorescence excitation test device is a test device for measuring the optical parameters of the test substance by exciting the test substance to emit light and testing the spectrum of the excited light (usually fluorescence). [0003] Refer to attached figure 1 , is a structural schematic diagram of a fluorescence excitation test device in the prior art. [0004] The fluorescent excitation testing device of the prior art comprises an excitation light source 101, a dark box 102 for exposure and measurement, an adjustable diaphragm 103 is arranged in the dark box 102 close to the bottom of the excitation light source 101, and a fluorescent powder test chamber is arranged below the excitation light source 101. A sample powder pan 104 is provided on the dark box 102 with an emitting light rece...

AI Technical Summary

Problems solved by technology

[0006] The shortcoming of this test device is: before testing, need to add fluorescent powder in the powder pan 104, the fluorescent powder is compacted, and utilize auxiliary tool to scrape the upper surface of fluorescent powder, so that after the light source shines on the fluorescent powder upper surface , the excited fluorescence can be emitted uniformly; however, this method has many defects:

[0007] 1) Due to this method of sample loading, the phosphor powder must be compacted, otherwise the surface of the phosphor powder will be uneven; but because the force of manual compaction is different each time, the surface density of the phosphor powder will be different, so in different tests, in When the excitation light is irradiated on the surface of the phosphor, there will be errors in the emitted light generated by the excitation of the phosphor

[0008] 2) It is difficult to ensure the flatness of the phosphor surface, and scratches or pits often appear, which leads to deviations in the direction of emitted light after the phosphor is excited.

At the same time, since the emitting light receiving device 105 is arranged at an angle of 45 degrees to the axis of the light source, the deviation of the light received by the emitting light receiving device 105 increases

Moreover, there is only one excitation light source, which will also lead to uneven illumination on the surface of the phosphor

[0009] 3) Due to the difference in the compaction force of the phosphor powder each time, the position of the phosphor powder surface will be different. Therefore, the transmission distance of the emitted light generated by the phosphor powder excitation is different in each test; according to Lang Berber's law, the light loss is inversely proportional to the square of the distance, therefore, the difference in light loss between each test will lead to errors in test results

[0010] To sum up, if the fluorescence excitation test is carried out with the existing technology, the error of the final measurement result is relatively large, and the referenceability is greatly reduced.

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