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Ultrasonic Piezo
Parents are most concerned to learn operation of Epson printer Survey - Epson, the printer-IT indust
Recently, the well-known printer manufacturer Epson primary and secondary students in Beijing on the parents of a "learning printer" survey, the purpose is to understand the Beijing students and parents in learning to use the printer's habit of buying factors, product information channels .
Recently, the well-known Printer Epson manufacturers on the parents of primary school in Beijing conducted a "study Printer "The survey aims to understand the primary and secondary students and parents in Beijing to learn the printer's usage habits, purchasing factors, product information channels.
Survey: parents generally preferred brand printers, such a basis, the purchase of study considered factors printer rankings were simple, long warranty, use and low cost. The purchase price of the printer, the universal psychological level parents in the 400-600 yuan. In addition, as long as the learning needs of children, the printer will consider the purchase of study surveyed the parents of nearly half the total. It appears that the products under the brand quality assurance of economic ease of use, stability is the most crucial needs of parents.
Parents willing to "pay", the first factor is the ease of use and stability Epson
The survey adopted a way of random street interviews, concentrated in primary and secondary schools, residential areas, commercial ultrasonic place, on a block of 100 parents visit. Problem involves the students learning habits, printer usage, and consideration of product purchase, product information channel sources.
In 100 samples, Beijing primary school students in the school as much as 81% in the proportion of will from Network On access to learning information, revision exercises and so on. Teachers use in school Electronic E-mail frequency assignments were 35% (regular) and 38% (occasionally). This shows that the current students in the School of Beijing has been widely used computer to complete the job, review the use of network resources to download information and exercises, but the electronic version of the reading method is obviously not suitable for students who repeatedly memory learning, which the printer into the families of students with learning provides a necessity.
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Epson ME300, The more you use the more economical
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ME300-One followed the Epson ME Series "with affordable affordable" pricing strategy, genuine printed with black ink 49 yuan / sticks, colored ink 55 yuan / support, and uses independent sub-body four-color ink cartridges design, used the same color for the same color, the effective use of cost savings. Children with a printed with black ink to print hundreds of pages of papers a semester exercises, definitely not a problem.
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About the Author
I am an expert from China Quality Lighting, usually analyzes all kind of industries situation, such as cody ultrasonic cleaner , ultrasonic stain remover.
What is the best Ultrasonic transducer?
1.Can a commercial (cheap) ultrasonic transducer having a center frequency of 40kHz be used to create ultrasonic waves of 18kHz to 2MHz.
2.I intend to create ultrasonic waves using a signal generator and an amplifier and I don`t know what to use as best transducer.
3.Can a piezo tweeter be used?
4.Can the ultrasonic waves be concentrated using a parabola?
5.I want to be able to create cavitation in a fluid in a test tube and I thought that the best way would be to use high powered ultrasonic waves. How can I calculate the correct lenght of a tube given a specific frequency?
Thanks.
a1)
O.K. what your talking about is the bandwidth of the transducer. A transducer will have a central frequency like you say (in this case 40khz) but it will also have a bandwidth. The bandwidth is the frequency range the transducer can operate within which will be less power output than the central frequency, however the power loss will only be limited. A transducer can usually operate outside of the bandwidth however the power loss will usually be more. The frequency range you are hoping to get from this 40khz transducer is quite high. I think it would be unlikely that it could do this range. If it can do this range, it would be very unlikely that the bandwidth would cover this range.
*note - you are not always able to get this bandwidth information before purchasing a transducer especially with a cheap transducer.
a2)
Choosing a transducer is very specific to the application which you are hoping to use it for. Some examples of questions to ask are; whether you need a water coupled transducer or an air coupled, whether the transducer will run in chirps/ pulses -ie. reduced duty cycle -(like for non destructive testing) or constant output, whether you require a narrow beam or a wider beam angle (like for distance measurement) or maybe you require the entire transducer to resonate (eg. bolted langevin transducer), how wide bandwidth you require, whether you will be attaching a horn (to concentrate and/or direct the output), whether it is a high output application or relatively low output, what the specific application is, what type of amplifier you are using (better to select the transducer before selecting the amp) - best if you can select a transducer that will run of a cheap amp like an pro audio amp if you want to save money, whether you require an industrial transducer or whether you could achieve your goals using a standard acoustic transducer like a loudspeaker.
a3)
piezoelectric and magnetostrictive are two different types of transducers. You could use piezo, it tends to have a wider bandwidth also, and it can also be used for very high frequencies. A standard tweeter would be difficult to use because it is only designed to only cover the audio range of up to 20khz. Also the output graph is something to consider. For example a tweeter may be rated to 20khz with a power output (spl) of 130db, but the output graph or output may drop off substantially at only 14khz. It is still rated to 20khz, but the power is very low at this level. I think that the frequency range you are trying to get is very wide, and maybe you will need an industrial transducer. As you appear to be trying to save money, maybe you can find a small or cheaper industrial transducer which can cover your application.
a4)
Do you mean a parabolic horn? Sometimes a horn is used to concentrate sound waves from a transducer. The transducer would have to be designed to accommodate a horn. A number of different types of horns are available. You would have to research this for your application. Professionally build horns can be very expensive. Maybe you can find a cheap copy somewhere, although it would be unethical to buy a direct copy of a more expensive design.
a5)
If you are serious about this you will have to do some research more than yahoo answers.
Piezo Pump, Ultrasonic for Medical Engineering, by www.pi-medical.ws