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Questions tagged [ultrasound]

Questions regarding Ultrasonic devices and uses. Ultrasound is higher than the typical human hearing range, with the low end at 20khz. Ultrasonic distance and Proximity meters are common. Be careful around Chiroptera and marine life. Your dog might not like it either.

Questions regarding Ultrasonic devices and uses. Ultrasound is higher than the typical human hearing range, with the low end at 20khz. Ultrasonic distance and Proximity meters are common. Be careful around Chiroptera and marine life. Your dog might not like it either.

282 questions
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Why has my tweeter speaker burned up?

I bought a powerful tweeter (or so I thought) to experiment with the ultrasound. The device is quite heavy, and it is rated at "350 watts RMS/700 watts peak": 2'' Titanium Super Tweeter PDBT78 Its nominal impedance is "4-8 ohms" with a frequency…
SlowBot
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Over what frequency range can the microphone of smartphone receive the sound?

I have a project in which I am considering using the microphone from a smartphone for the reception of inaudible signals (> 15khz). What is the frequency range that such a microphone of receive sound? And what is the maximum frequency ?
user2094134
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Why are sound waves the best choice for many location detectors?

I'm currently working on my high school final project, which is basically a radar. I'm using the SRF05 detector to detect objects that are near the surface of the device. My current assignment is to learn and summarize all the different components…
Eminem
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How do I drive an ultrasonic transducer with an Arduino?

I am attempting to build a cat deterrent with an Arduino, something akin to this. I have figured out detection, and now realize that I need to use an ultrasonic transducer to produce the 'blast' that I need. However, I am clueless as to how I would…
Michael Gorsuch
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Driving 50W-250W ultrasonic transducers with sine: Any Class B 135KHz monolithic power amp ICs?

My project needs to drive a medium power ultrasonic piezoelectric transducer from a sine wave (/ sawtooth) sweep generator that sweeps +/- 2% of the transducer resonant frequency. The question: What are my simplest options for driving these…
Anindo Ghosh
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Collimating a sonar beam

Wondering if anyone is aware of a way to cause an ultrasonic proximity sensor to be modded, such that, it's forward line-of-sight range remains unaffected, but it's angular spread is reduced, somewhat in the "collimator" sense (in terms of light).…
bdutta74
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Underwater distance measurement/Sensing

I am working on a project from University which includes a ROV. I am trying to come up with an easy way to create a Distance Sensing system, which doesn't require a lot of work. something very simple that can measure up to 20 cm, with a fair…
user1622997
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Boosting 5V/2A to +70/-70V for op-amp rails?

I am trying to drive an ultrasonic "tweeter" for a wearable research project. Compared to a normal speaker, the tweeter has a very high impedance, upwards of 4kohm. As a result, it requires a very high voltage to produce appreciable power, but the…
Ian Reynolds
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What is the "loaded resistor" for ultrasonic receivers?

I have an ultrasonic receiver (datasheet available here). On page 2, there are two graphs plotting sensitivity variation and center frequency shift versus "loaded resistor": What does "loaded resistor" exactly mean in this context?
Randomblue
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Driving LM3886 at 100 KHZ in Bridge Tied Load (BTL) configuration?

Would someone have experience with driving a pair of LM3886 Overture Power Amplifiers in BTL with up to 100 KHz sine wave? My parameters: Frequency band of interest: 20KHz to 100 KHz, sine wave Load is pure capacitive, 10-20 Ohm, 5000 pF Power…
Anindo Ghosh
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Can computer speakers emit ultrasound?

Can computer speakers emit ultrasound? What is the maximum frequency that computer speakers can produce?
zwclose7
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Time of flight difference in hardware

I have an ultrasonic emitter, and two ultrasonic receivers. When the emitter emits a pulse, the receivers get the signal at different times. I am only interested in the difference between the two reception times. At first, I was thinking of using a…
Randomblue
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transmit data wirelessly under water?

I am looking into constructing a small submarine with a Raspberry Pi. This is just for a hobby project but my idea is to have it communicate with the surface wirelessly. I know that normal radio waves will not work very well so I was thinking of…
Yamaha32088
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What type of ultrasonic transducers are used in medical ultrasound devices?

When I search on DigiKey for ultrasonic transducers, all I get back is the circular transducers that are sold for the various DIY projects. i.e. the picture below: However, the "medical" ultrasound devices have a wand, that houses an array of what…
KingsInnerSoul
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How do ultrasonic sensors differentiate between transmitted and received signals?

I understand how these ultrasonic sensors work on the basic level: They send out ultrasound, which is then reflected by an object and is then sensed by the receiver. But the receiver and the transmitter are placed side by side. Won't the receiver…
S. Rotos
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