Dynamic light scattering variable angle optical fiber probe detection device and detection method

Abstract

The invention discloses a dynamic light scattering variable-angle optical fiber probe detection device and a detection method, belonging to the field of dynamic light scattering nano particle detection devices. It includes a fiber optic probe and a sample cell (7), one end of the fiber optic probe is connected to the sample cell (7), and a through hole is provided at the connection, and it is characterized in that: the fiber optic probe includes an outer shell (1), an optical fiber, a lens and Angle adjustment mechanism, one end of the transmitting lens (5) and receiving lens (9) is correspondingly connected to the transmitting optical fiber (4) and receiving optical fiber (10), and there is an adjustment between the transmitting lens (5) and the receiving lens (9). An angle adjustment mechanism for the included angle, the fixed end of the angle adjustment mechanism is fixedly connected to the outer shell (1). The invention simplifies the structure of the detection device, reduces the volume, and adjusts the angle between the emitting light path and the receiving light path through an angle adjustment mechanism to receive scattered light at an optimal scattering angle, thereby improving the accuracy of detection data.

Description

technical field [0001] The invention discloses a dynamic light scattering variable-angle optical fiber probe detection device and a detection method, belonging to the field of dynamic light scattering nano particle detection devices. Background technique [0002] The particle size and distribution of submicron and nano-particles are the main parameters to characterize their performance, and dynamic light scattering technology is an effective method for measuring the particle size of sub-micron and nano-particles. In dynamic light scattering particle measurement technology, photon correlation spectroscopy is widely used, which uses photodetectors to receive scattered light at a fixed spatial position. Due to the extremely weak scattered light, the photodetector can only receive discrete photon pulses, and at the same time output corresponding electrical pulses at the output end, and send the pulse signals to the photon correlator. After the photon correlator performs autocorr...

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Problems solved by technology

[0003] However, the optical path of the traditional dynamic light scattering device is complex, resulting in a large volume of the entire measurement device, and because the scattered light is transmitted in the air, it is easily disturbed by dust, external light and vibration, resulting in a low signal-to-noise ratio of the system, and the photon correlator The quality of the output correlation function is degraded, so credible measurement results cannot be obtained, so that the traditional dynamic light scattering device is only suitable for laboratories and cannot be used for industrial online measurement

Moreover, the optical path of the existing dynamic light scattering device and the position of the probe are fixed and cannot be adjusted according to needs, which brings a lot of inconvenience during the testing process

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