Ultrasonic Transducer. Piezoelectric ceramics / Piezoelectric polymer film / Piezoelectric thin film

Transcription

1 Ultrasonic Piezoelectric ceramics / Piezoelectric polymer film / Piezoelectric thin film

2 Ultrasonic Technology is gentle both to the Earth and humankind Diminution of negative influences to the environment, which are caused by certain human activities, has now become an urgent and important theme worldwide. From the ordinary life patterns of humankind to industrial operations, a balance of what is beneficial to the environment must be achieved. Ultrasonics is indispensable in the search for solutions that will preserve a wellbalanced and clean environment. Ultrasonics is demonstrating its capabilities in the analysis of damaging materials like dioxin, and also in the definition of bio-fuel in the water. With the utilization of ultrasonic technology, Honda Electronics Company, Limited will continually endeavor to achieve solutions that will aid in the prevention of pollution to the environment. Piezoelectric ceramics anion cation Contracts when a potential is applied to the upper part and a potential to the lower part Expands when a potential is applied to the upper part and a potential to the lower part. Apply pressure. Acoustic sounds are generated just by hitting an object. The generation of high frequency ultrasound, requires a special method. A transducer made of a piezoelectric ceramic material repetitively contracts and expands when subject to alternating voltage. Conversely, when alternating pressures are applied to the transducer, alternating voltage appears across the transducer. This is the piezoelectric effect. The transducer is also called an electroacoustic element. A piezoelectric ceramic material is a polycrystal ceramic made by compressing a high purity powder (titanium oxide, barium oxide, etc.) and firing it at a high temperature. When a polarization process is applied, this ceramic material attains a piezoelectric property similar to that of a single crystal such as quartz. Ultrasonic transducers based on the piezoelectric ceramics are the key technology supporting the advance of ultrasonic devices. 1

3 Piezoelectric ceramics, piezoelectric polymer film, and piezoelectric thin film are used as piezoelectric materials to generate ultrasound. Piezoelectric ceramicsbatio3, PZT, PbTiO3,(Bi,Na)TiO3 Piezoelectric ceramics is polycrystal ceramics made by compressing a high purity powder such as titanium oxide and barium oxide and firing it at a high temperature. The piezoelectric property is obtained through a polarization process. Piezoelectric polymer filmpvdf-trfe A piezoelectric polymer film is produced by forming a film from molten polymer or its solution, and applying a polarization process to the film. This type of piezoelectric material is characterized by very low acoustic impedance, flexibility and ease of forming a thin film from a solution. Piezoelectric thin filmzno A piezoelectric thin film is made by sputtering zinc oxide (ZnO). To make an ultrasonic transducer, zinc oxide film is formed on a substrate such as quartz or sapphire in a C-axis orientation. Table of physical properties Property Unit Symbol HC-70BN HC-60AH HC-50GS HC-51GS HC-40H HC-30D Zn-P Coupling factors k p k 31 k 33 Dielectric constants T 33 0 constants N p N 31 N 33 Piezoelectric strain constants d 31 d 33 Piezoelectric voltage constants g 31 g 33 Youngs modulus E Y 33 Mechanical Q Qm Dissipation factor tan Poisson ratio Density Curie point Cleaning Flaw detection Thickness measurement Medical diagnosis Airborne level measurement Fish finding Cleaning Machining Atomizing Welding Cleaning Machining Atomizing Welding Flaw detection Thickness measurement Medical diagnosis Fish finding Airborne level measurement Microscopy Flaw detection 2

4 Types of ultrasonic transducer Piezoelectric ceramics transducer Shape of electrode Double-sided electrode Folded electrode Piezoelectric polymer film / ZnO thin film Ultrasonic flaw detector Ultrasonic microscope Polymer film ZnO thin film Bolt clamped Langevin type transducer for cleaner Because of piezoelectric ceramics is mechanically combined, the transducer is very durable free from damage even under the high amplitude vibrations. Furthermore, it is possible for stable operation with high electroacoustic conversion efficiency and less heat generation. PZT type Thickness vs torque Mass(g) Diameter(mm) Length(mm) Joint screw size (khz) Measurement voltage(vrms) Impedance () Static capacity (pf) Max. input power (W) Thickness Installation (mm) torque(nm) (30 or less) (50 or less) (35 or less) (35 or less) (30 or less) (35 or less) The installation torque value is a standard. (Bi,Na)TiO3 type Lead-Free Piezoelectric Ceramics Thickness vs torque Mass(g) Diameter(mm) Length(mm) Joint screw size (khz) Measurement voltage(vrms) Impedance () Static capacity (pf) Max. input power (W) Thickness Installation (mm) torque(nm) is Honda's brand name of lead-free piezoelectric ceramics. The installation torque value is a standard. 3

5 Bolt clamped Langevin type transducer for process machinery A high amplitude can be achieved with high electroacoustic conversion efficiency, low mechanical vibration loss, and less heat generation thanks to the original structure design. Mass(g) Diameter(mm) Length(mm) Joint screw size (khz) Measurement voltage(vrms) Admittance (ms) Static capacity (pf) Max. input power (W) (Nm) Transmission installation torque The installation torque value is a standard. for high power process machinery A high-power transducer achieves high amplitude and low heat generation with a structure where intermediate heat radiation plates are inserted between ceramics. Mass(g) Diameter(mm) Length(mm) Joint screw size (khz) Measurement voltage(vrms) Admittance (ms) Static capacity (pf) Max. input (Nm) power(w) Transmission installation torque The installation torque value is a standard. 4

6 Expansion of s Ultrasonic cleaning : Ultrasonic cleaners (tank typewater flow type)/ultrasonic defoaming s for ultrasonic cleaning are used not only for cleaning but also for stirring, defoaming, and many other technologies.with its load stability, this type of transducer is best suited for gaining high output power. *For details of ultrasonic cleaners, please refer to their brochures. Ultrasonic cleaner Pizo-ceramics Bolt clamped Langevin type Ultrasonic machining : Ultrasonic welder/ultrasonic cutter s for ultrasonic machining, which use materials with small inner mechanical loss, have superior characteristics of high electrical conversion efficiency that enables large-amplitude vibration with low heat generation. Ultrasonic welder Ultrasonic cutter Bolt clamped Langevin type (with a horn) Bolt clamped Langevin type (with a horn) Ultrasonic underwater measurement : Ultrasonic fish finder/ultrasonic interface level meter s for ultrasonic underwater measurements generate ultrasonic waves in the water to get and display image information obtained by ultrasonic pulses reflected on a school of fish or the seabed. Ultrasonic fish finder Ultrasonic fish finder Ultrasonic interface level meter Bolt clamped Langevin type Pizo-ceramics Pizo-ceramics Ultrasonic airborne measurement : Airborne ultrasonic level meter/doppler speedmeter s for ultrasonic airborne measurement generate ultrasonic waves in the air to get and display information (distance, reflection intensity, move speed) obtained by ultrasonic pulses reflected on various objects. Airborne level meter Airborne sensor Ceramics (with an acoustic matching layer) Ceramics (with an acoustic matching layer) 5

7 Ultrasonic measurement : Ultrasonic flaw detecting and imaging system/ultrasonic microscope/ultrasonic medical diagnosis equipment s for ultrasonic measurement are used in a relatively high frequency band from 1MHz to 400MHz. Base on the recent evolution of ultrasonic technologies, this type of transducer has become an necessity in the medical diagnosis field and the non-destructive testing field. Ultrasonic microscope Ultrasonic flaw detecting and imaging system Ultrasonic medical diagnosis equipment Ultrasonic flow meter Piezoelectric thin film (with an acoustic lens) Ceramics (with an acoustic matching layer) Piezoelectric polymer film Ceramics (with an acoustic matching layer) Pizo-ceramics Notes on Usage Products and specifications described in this catalogue are subject to change or discontinuation without notice due to improvements. The delivery specifications should always be requested to check the details before use. The performance and quality of each product are guaranteed to the limits stated in this catalogue, however, evaluation and confirmation of factors such as suitability of piezoelectric ceramic materials, mounting methods, and drive methods for the products are required in their actual mounted state prior to us, according to customer requirements. Failure to use products in accordance with the specifications (including performance, ratings, and usage range) indicated in this catalogue may result in physical injury, fire, or social loss. If you have any questions regarding usage, please feel free to contact Honda Electronics. The products described in this catalogue are intended for use with standard equipment. Customers considering use with equipment or systems requiring exceptionally high reliability and safety should confirm the suitability of products prior to their use. Please note that Honda Electronics accepts no responsibility for any problems related to the intellectual property of third parties resulting from the use of these products, except for issues directly related to Honda Electronics' product construction and manufacturing processes. The details contained in this catalogue are correct as of September

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