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.

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Ultrasonic digital parametric speaker: What kind of modulation and how does it need to be modulated?

I searched for information on digital 40kHz ultrasonic parametric speakers. While most open sources do mention that you need some modulation, what type of modulation and how it does so is hardly ever ...
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2 answers
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Picking up ultrasonic signals on a hydrophone

I bought two Aquarian H2A (3.5mm version, not XLR) hydrophones for receiving faint ultrasonic signals (29 KHz) being generated by an underwater sensor node. I am running into some issues. I tried to ...
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Bandpass filter test results not same as simulated results

I am designing a 40 kHz bandpass filter for a university project involving a portable ultrasonic device. I have designed a 40 kHz filter using the Linear Technology Filter Design Tool with a single ...
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Offsetting an ultrasonic receiver's signal for an amplifier with a floating ground

I have an ultrasonic receiver that I'm putting through an amplifier. I've created a floating ground for the amplifier (because I want to pretend having a negative voltage supply). However, to achieve ...
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2 answers
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Why do ultrasonic cleaner transducers usually have two piezoelectric discs (or rings)?

Most of the diagrams for them I've seen show that. Is it for the purpose of amplification, or some other reason?
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How to hook up discrete ultrasonic sensor pair to Arduino board?

I have a pair of ultrasonic sensors, one of which is a transmitter and the other is a receiver. How do I hook them up to the Arduino board? The board is an Arduino Uno board and the sensors are ...
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Use TC4427EPA to drive an audible buzzer

I am using a TC4427EPA to drive a piezo buzzer, with two bypass capacitors on the supply voltage, as recommended by datasheet. I have used the same setup to drive a 40 kHz ultrasonic speaker (with a ...
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Why is my Multivib piezo atomizer/transducer driver not working?

I'm tying to drive a "Moisturizing Transducer Mist Maker Atomizer Film Plate" using a simple astable multivibrator circuit like this: I can't make it work. No reaction from the atomizer. I ...
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Component identification - ultrasonic transducer

We have a Chinese made ultrasonic transducer, 120kHz approximately, 25mm x 25mm dia. It has three wires - red, green and white. The body is PVDF We have determined that the red and white are used to ...
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Can this buffer provide adequate current to drive an ultrasonic transducer?

I am using a BUF634P Buffer (Datasheet) to drive a wideband ultrasonic transducer. The impedance of the transducer varies with frequency and reaches a minimum X = 100 Ω, while its resistance (...
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How to verify my ultrasound transducer is working?

Hi I am fairly new to electronics equipment and over the past weeks have been setting up an ultrasound device to simulate traumatic brain injuries in samples at the lab I work at. My setup consists of ...
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1 answer
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Estimate transmitted ultrasonic power

I want to use ultrasonic (20 kHz to 100 kHz) transducers to couple ultrasound into pipes for cleaning purposes. You can easily buy those transducers with driving circuits on Aliexpress but I want to ...
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Sender Circuit for Ultrasound

I'm building this Instructables project: Body-ultrasound Sonography With Arduino, which is using ultrasound to see inside the body. However I'm having some issues with the sender circuit, shown below: ...
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2 votes
1 answer
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What sort of iron rod should I use in a magnetostriction oscillator?

I'm trying to make a magnetostriction oscillator at home. Here is the circuit diagram: 1 DC Power Supply 2 Ferromagnetic Core (Iron) 3 NPN Bipolar Junction Transistor (2N2222) 4 Capacitor C 5 Primary ...
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1 vote
2 answers
158 views

How to build a circuit which allows a piezo transducer to act as both a transmitter and receiver

I am a student and am currently working on a project where I require a piezo transducer to act as both a transmitter and receiver. I am finding it difficult to build a circuit where a pulse can be ...
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Methods to drive an ultrasound transducer

I am purchasing an ultrasound transducer with these specifications I have been looking to use this transducer to achieve focal pressure of .6Mpa or less and have been searching for the best way to ...
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Low-Intensity Pulsed Ultrasonic (LIPUS) Circuit

I am trying to find a circuit schematic of a device that can create ultrasound wave frequencies of 1-3 MHz and deliver intensities of 2 - 30 mW/cm^2. I am on a Summer research project and need to know ...
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3 answers
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Using a microphone to pickup ultrasonic sounds to trigger events

I'm building a PCB design that will trigger certain events when the onboard microphone picks up specific sounds outside of the range of human hearing. The desire is to be able trigger events remotely ...
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Ultrasonic sensor ON/OFF switch with transistor

I have an ultrasonic sensor (JSN-SR04T) connected to an Arduino. In order to achieve low power consumption i decided that i want to switch the Ultrasonic sensor off for 8 seconds intervals in between ,...
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Can I use Op-Amps to drive a ultrasonic piezo transducer at 200kHz

I’ll admit I’m not the most knowledgeable guy when it comes to electronic circuits, so I thought I’d ask before breaking anything. I’m looking to drive a piezo transducer using a 200kHz sine wave. The ...
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1 vote
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How to match Transformer output Impedance for Ultrasonic Cleaning Transducer

I have a transformer outputting the 240VAC 40kHz. The Transducer is 50W, 4100pF, 10-20 Ohm at resonance, ~40kHz resonance) The Secondary of the transformer is 12mH. I am trying to match the impedance ...
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Can anyone help with an Ultrasonic Transducer Transformer design. Air gap or no?

I am looking at using a centre tap transformer with a 12mH secondary to drive a 50W 40kHz ultrasonic transducer (4100pF 10-20Ohm resonance impedance) for cleaning applications. The input voltage is ...
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1 answer
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Why can't the HC-SR04 sensor detect objects that are very close to it?

I am following this worksheet and I am struggling to understand the following piece of code: ...
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2 votes
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CW Doppler probe for fetal doppler and blood flow velocity

I am currently working on a microcontroller based project to measure the blood flow velocity using ultrasound doppler. I have purchased two Spengler 8 MHz continuous mode probes in order to measure ...
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How does pulser-receiver circuit work

I want to set up an experiment exactly as given in this data sheet for the T/R switch that I recently bought (the MD0101): Every pulser receiver circuit that I’ve found neglects to address what ...
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Easier ultrasonic distance measurement technique

In ultrasonic distance measurement a train of pulses is sent using typically a 40Khz piezo transducer. After some time the same piezo transducer is used to receive the pulses and distance calculated ...
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What is limiting high frequency ultrasound from being high power

This is mostly just our of curiosity and I feel like I may be missing something basic, but what is limiting ultrasond transducers in the range of 500kHz-MHz from not outputting higher power like the ...
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1 answer
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Custom Ultrasonic Sensor Schematic

I am trying to recreate this project. I have the circuit constructed on a breadboard. I am using an SP232 instead of a MAX232, a TIP42CG PNP instead of a BC557 PNP, and an Arduino Uno instead of an ...
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DIY ultrasonic sensor

I attached the link for the project I am trying to implement. Instead of using an Arduino, I will use either an ESP32 or an STM34. What is the purpose of the MAX232? Is there something else I can use ...
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18 votes
5 answers
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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 ...
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What are the advantages and advantages of ceramic and Langevin transducers for ultrasonic cleaners?

I have an old large ultrasonic cleaner with 5 ceramic piezo electric transducers (pictured below) epoxied to its tank's underside. They use around 40W of power each. Newer ultrasonic cleaners, ...
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1 vote
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Parallel Resonance in Ultrasonic Transducers (Langevin)

I am working on a power-supply for ultrasonic welding machines and want to drive the transducer at its parallel resonance. The Butterworth-Van Dyke model paramters are : L = 24.73e-3; C = 1.14e-9; Cos ...
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1 vote
1 answer
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Arduino ultrasonic sensors in closed spaces

I am wondering whether or not it is possible to use an Arduino ultrasonic sensor in a closed box (30 cm x 30 cm.) I have been told that the walls will cause the signal to bounce all over the place and ...
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Septic tank depth sensor

I am on a hunt for a depth sensor for my septic tank. The task: to measure the current depth of a septic tank, where I would submerge the device where the sensor would send a ping to detect the ...
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2 answers
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Building a Comparator

For my final project, we are building an ultrasound range finder, without using a microcontroller. I have been able to build a block diagram (attached document). In the circuit, I'm using a 555 timer ...
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1 answer
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Unable to convert ultrasonic sensor 5V echo to 3.3V using TXS0108E 8 Channel Logic Level Converter Bi-Directional

I'm trying to use an ultrasonic sensor with a Raspberry Pi. The ultrasonic sensor's echo is 5V, but the Raspberry Pi's GPIO pins can only handle 3.3V inputs. I ended up getting an 8 channel logic ...
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5 votes
1 answer
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Why does medical ultrasound use pulses instead of chirps?

My background is in radar where it's quite common to use chirped excitation signals (i.e. pulse compression). I have noticed that this method seems to not be used in medical ultrasound. Why not?
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1 vote
0 answers
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Low-pass filter on PDM data provides data that does not have a FFT

I'm trying to convert PDM data into analog form by passing the data through a low-pass filter in Matlab. My approach is fairly simple and matches the answer given in this Electrical Engineering Stack ...
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1 answer
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communication via ultrasound

I want to communicate simple requests and ids over ultrasound. To do this I need to modulate a message onto a 40kHz carrier to drive a ultrasound transducer. Here you can find a simulation of what I ...
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1 vote
2 answers
94 views

FFT Frequency Bin - Impact on Energy Totals

If I reduce the number of samples used for an FFT (increasing the width of the frequency bins), is it correct to say that the energy in two bins with smaller frequency bins (eg. 10kHz-20kHz and 20kHz-...
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Tweeter speaker enclosure size and material

I try to make a system that generates high frequency tones ( 12-17kHz ) only. Use some cheap tweeters like : https://www.banggood.com/100W-Piezo-Horn-Speaker-Tweeter-30KHZ-Piezoelectric-Head-Driver-...
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0 votes
1 answer
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How to measure the voltage over a transducer? aka how to measure ultrasound

I want to measure ultrasound. For this task I bought a sensor, and an instrumentation amplifier. Apparently it doesn't work the way I thought because when I test it with a sample 40 kHz wave as input ...
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2 votes
3 answers
448 views

Deliver a 40kHz & >40V cosine wave to a transducer for communication

I'm trying to do on/off keying (OOK) to transmit messages with ultrasound. This is the transducer. This is the schematic of the signal generator and amplifier: It seems that the class A amplifier ...
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3 votes
2 answers
199 views

Why do many ultrasonic sensors have specific frequencies (48 kHz & 58 kHz)?

I am working in the automotive industry and I found that many of the ultrasonic sensors on the market (sonars) have specific frequencies, namely 48 kHz and 58 kHz. (Not that other frequencies are ...
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2 votes
2 answers
1k views

Building a simple microphone jammer

A microphone jammer is a device that broadcasts ultrasound waves and, due to the non-linearity of mic amplifiers in small gadgets (i.e. smartphones) it overwhelms the microphone so the only sound the ...
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0 votes
2 answers
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What technique (ultrasound/infrared) should I use to detect seeds inside a fruit? [duplicate]

This fruit is simplistic as there is a thin skin surrounding it. Inside it is a tiny ball of liquid and that is where the dense seed forms. The is seed much more denser in comparison with the liquid ...
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1 answer
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How to scale audio signal from PCM data to a dB SPL value?

0 I've got a set with MEMS microphones that measure audio signals at ultrasonic frequencies. The MEMS microphones have a PDM output which is then converted into PCM (this is necessary to allow for a ...
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3 votes
4 answers
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Measure distance using an ultrasonic sensor in a pipe

I am trying to find the distance of an object in a pipe, but I am getting wrong values using the ultrasonic sensor with an Arduino as the sound is bounced back from the surface of the pipe. What do I ...
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Assistance in finding proper sensor for short-range object detection task

We are working on a research project. We try to measure the distance from an object to some static line/pole. The area of interest is within a range of 1 to 5 meters, and the tracked object is a human....
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Have I understood this solution to the sensor synchronization problem correctly?

I read a research paper which proposes an algorithm to synchronize sensors in a way that is independent of the sensors. Beginning with the simplified version which assumes no drift between the sensor <...
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