Abstract
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.
Highlights
Magnetic fluid, composed of nanoscale magnetic particles, a carrier liquid, and surfactants, is a type of functional material, possessing the fluidity of liquids and the magnetic properties of the colloidal solids
With the enhancement of the magnetic field, the variation in the sensor sensitivity can be divided into four stages: first decreasing sharply, secondly increasing, decreasing gradually, and tending toward a small stable value
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, decreasing gradually, and tending toward a small stable value
Summary
Magnetic fluid, composed of nanoscale magnetic particles, a carrier liquid, and surfactants, is a type of functional material, possessing the fluidity of liquids and the magnetic properties of the colloidal solids. The properties of the magnetic fluid include the magneto-optical effect [1–4], the thermal lens effect [5–7], and the tunable refractive index [8–12]. Many properties of magnetic fluids can be exploited in a wide range of applications for optical devices, fiber optic sensors, and optical communication. The magnetic fluid sensors based on optical transmission properties have a wide application prospect in the field of online condition monitoring of power equipment. There are many factors that affect the sensitivity of the sensor, such as sensor type, sensor structure, and sensor material. For the magnetic fluid sensor based on the optical transmission properties, the incident power is a key factor. This paper studies the influence of the incident power on the sensitivity of the magnetic fluid sensor based on the optical transmission properties
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