Piezo ceramic is a kind of capacitive device sintered of lead zirconate titanate, which can produce deformation displacement under voltage drive and generate certain charge energy under the action of external force, that is to say, piezo ceramic has positive piezoelectric effect and inverse piezoelectric effect.
Working Principle of Piezo Tube
Piezo tube is a tubular piezo ceramic, which is similar to the common sheet piezo ceramic. Conductive electrodes are printed on the inner diameter surface and outer diameter surface of the piezo tube, generally silver electrodes. In addition to the internal and external surfaces, the internal materials are all piezo ceramics. Therefore, it also has the piezoelectric effect, when the voltage is applied to the inner and outer electrodes, the piezo tube will produce a radial displacement.
Experiment of Piezoelectric Tube Tensile Fiber
To understand how much the piezoelectric tube can stretch the fiber, CoreMorrow uses a device like the one shown below. A voltage is applied to the tube by a piezo controller, and the tube is driven by the voltage to produce a deformation displacement. Finally, the deformation displacement of the piezoelectric tube is measured.
Experimental Executor
Harbin Core Tomorrow Science & Technology Co.,Ltd
Experimental Equipment
E01 piezo controller * 1 , output voltage up to 300V
Piezoelectric tube * 1
LVDT micrometer
Optical fiber, diameter= 0.25mm, length=5m
Magnetic table bracket * 2
Experimental Objective
The purpose of this experiment is to measure the displacement of the piezoelectric tube with optical fiber in the outer diameter under voltage drive, and estimate the length of the optical fiber to be stretched from the measured data.
Experimental procedure
In order to carry out the experiment smoothly, the experimenter wrapped the optical fiber of 0.25mm in diameter and 5m in length on the outer surface of the piezoelectric tube in advance, and fixed it with epoxy resin glue. The length of the optical fiber wound on the outer surface of the piezoelectric ceramic tube is about 4.4m, with 30cm reserved at each end.
The size of the piezoelectric ceramic tube used in the experiment is OD 51mm, ID 43mm, height 40mm. In the experiment, a sensing probe of an LVDT micrometer is placed on each of the two opposite outer diameters of the piezoelectric ceramic tube, used to measure the radial displacement caused by the expansion of piezoelectric ceramic tubes during the application of voltage.
In the experiment, a voltage signal ranging from 0 to 300V was applied to the piezoelectric ceramic tube. Through the experiment, it can be observed that as the voltage gradually increases from 0V, the displacement values measured by the two LVDT micrometers also gradually increase.
At 300V, the sum of the displacement measured by the two LVDT micrometers is about 0.8μm, which is the total radial displacement, that is, the diameter increases by 0.8μm. According to the calculation formula of the perimeter, it can be estimated that the stretch length of each turn of fiber is about 2.5μm.
Experimental Results and Analysis
The experiment shows that the piezoelectric ceramic tube can be driven by CoreMorrow piezo controller, and the purpose of stretching the optical fiber can be achieved.
In this experiment, we can come to a conclusion by observing some phenomena:
1)The displacement values measured by the LVDT micrometer installed at both ends of the piezoelectric ceramic tube are different, may be because of the different preloaded forces at both ends. When the preload is close to the same, the values of the two inductance micrometers are almost the same.
2)Different dimensions of piezoelectric ceramic tubes affect the displacement of radial expansion of tubes. Generally, the larger the outer diameter, the larger the radial displacement of the piezo ceramics will be, other things being equal.
3)The tightness of the optical fiber also affects the length of the optical fiber. Therefore, the optical fiber can be wound in a normal state.
4)In this experiment, the length of the fiber stretched is estimated by the formula. To accurately measure the length of the fiber stretched, it needs to be obtained with the optical sensor and the corresponding algorithm.
Conclusion
Piezo ceramic is very suitable for fiber stretching applications, and it has been widely used in many fields, such as fiber sensing, scanning interference and so on. In addition to the piezoelectric ceramic tube, CoreMorrow also offers other piezoelectric products for fiber stretching, such as piezoelectric ceramic stack, fiber tensile expander or custom optical fiber, optical fiber phase shifter tensile structure, etc., with CoreMorrow piezo controller, power amplifier, etc to complete optical fiber drawing and phase modulation.