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The Influence of Incident Power on the Magnetic Fluid Sensor Sensitivity Based on Optical Transmission Properties
摘要： Sensitivity is a critical characteristic of sensors, and increasing the sensitivity of the sensor is valuable for measurement study. Incident power has an important influence on the sensitivity of magnetic fluid sensors based on optical transmission properties. Variation in the magnetic field sensitivity at different incident powers was investigated by the measurement of transmitted power through the magnetic fluid sensors. As the magnetic field strength increases, the sensitivity variation of the magnetic fluid film sensor can be divided into four stages: first decreasing sharply, secondly increasing, then decreasing gradually, and finally tending toward a small stable value. The magnitudes of the change in the sensor sensitivity are influenced by the incident power, because the structural pattern of the nano-magnetic particles in the magnetic fluid sensor changes, the Soret effect and the Photonic Hall effect co-define the sensing system. In the weak magnetic field range, when a higher sensitivity is required, it is appropriate to select a larger incident power; however, in a large magnetic field range, when a higher sensitivity is required, a small incident power should be selected. Therefore, the magnetic fluid film sensor exhibits different sensitivity characteristics if different incident power values are chosen. The appropriate incident power can be selected according to the range of the magnetic field to be measured to improve the sensitivity in the magnetic field measurement study.
关键词： sensitivity,magnetic fluid sensor,Photonic Hall effect,incident power,optical transmission properties,Soret effect
更新于2025-09-23 15:21:01
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The Scaling of Ligand Concentration and Soret Effect Induced Phase Transition in CsPbBr3 Perovskite Quantum Dots
摘要： The intelligent chemistry strategy based automated machine is applied for the study of the phase transition in the CsPbBr3 quantum dots (QDs). With the in-situ photoluminescence (PL) signal detector and analysis module, the oleyl amine (OLA) and oleyl acid (OA) ligands concentration dependent diffusion picture are well derived, a three-stage power-law scaling is disclosed on the ligands concentration dependent growth, and a phase transformation from CsPbBr3 to Cs4PbBr6 QDs are confirmed. Based on the experimental analysis associated with the G0W0-BSE calculation, we confirmed that there is no significant PL signal in the pure Cs4PbBr6 structure. With the steady temperature control module, we find the ligand concentration and the Soret effect are isomorphic for the mass flux in the QDs nucleation and phase transformation. We find the activity of the surface states can be essential for the size dependence of the Soret effect in a general way.
关键词： CsPbBr3,Soret effect,quantum dots,phase transition,ligand concentration
更新于2025-09-16 10:30:52