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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70 views

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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48 views

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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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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30 views

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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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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1answer
77 views

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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42 views

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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2answers
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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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1answer
75 views

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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1answer
163 views

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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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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57 views

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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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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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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3answers
355 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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2answers
128 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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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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2answers
97 views

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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1answer
103 views

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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4answers
662 views

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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0answers
72 views

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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37 views

Understanding the workings of an ultrasonic sensor

I am trying to simulate an ultrasonic sensor using a ray-based approach. For that, my current process can roughly be described as such: approximate wavefront using rays that mimic the shape of the ...
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1answer
248 views

Narrowing the beam of an ultrasonic sensor

I need to measure the distance to a solid or liquid in a round tank about 2 feet wide and 5 feet deep using a sensor that can output PWM and run at 3.3 or 5 volts. After testing, I've found that the ...
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1answer
81 views

Directional Speakers

I am working on an exhibition where I want to use DIY, self-made directional speakers for transmitting interviews to the visitors. Until now I have seen a couple of video on Youtube like the one ...
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110 views

Is my ultrasonic cleaner using a common mode choke as an AC to DC converter?

I am repairing an ultrasonic cleaner with a faulty circuit board. It has a blown out diode and capacitor that needs to be replaced. The board, however, has me curious and confused as to its function. ...
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Measure distance to object with angular precision - invisible for camera

I want to build myself an arduino based follow-focus. There is one mode intended for using a joystick for manual control of focus and zoom. This code already works a treat. Now I want to add a ...
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3answers
96 views

How do I amplify a square wave pulse of 4 to 8 periods at 3.5 MHz from +-2V to +-60V or more?

I am working with ultrasound sensors optimized for 3.5 MHz signals, and I want to test these using my PicoScope 5000 with integrated signal generator. The PicoScope is able to generate arbitrary ...
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44 views

Analog phase shifting circuit

I have a high voltage(let's say +-100Vpp) sine signal of 500khz and i want this signal to be phase shifted(+ve) by 0, 90, 180 and 270 degrees. That is a circuit which has 500khz input signal and 4 ...
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3answers
579 views

High pitch audio frequency measuring

Wondering on how could higher pitches than 23 kHz be measured, I can only find devices measuring to about 21kHz. Main question is: how could audio frequencies about 26 kHz or 30 kHz be measured, on ...
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1answer
99 views

DAC update rate vs ADC update rate?

I am building a system for ultrasonic distance measurement that implements CDMA coding access. Therefore, I am using DAC with 3 outputs for generation of three different signals and an ADC for ...
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1answer
50 views

How to send different data to three DACs at the same time?

I am building ultrasonic system that needs to generate three different signals for three transducers at the same time.The system is controlled via DSP. Currently I have a DAC with 4 outputs, but as I ...
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0answers
54 views

Components to record ultrasonic sound? Up to 200kHz

For a personal project, I’m trying to record ultrasonic sound. I would like to find the best way to record from 20kHz to 200kHz. As I found from Wikipedia, animals can hear up to 200kHz. As I prefer ...
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1answer
62 views

MUX for receiving 1MHz ultrasonic signal from multiple transducers

I have one ultrasonic transducer that is connected to high voltage Pulser (1-2MHz), I want to detect the ultrasonic signal generated by this transducer with other multiple transducers (~16). I have an ...
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1answer
103 views

How are high voltage ultrasounds kept safe?

EDITED question to be more useful. I don't understand why driving piezo ultrasound at 100V isn't a huge safety hazard. I have seen lab settings where the lead wires are attached to a device on skin. (...
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4answers
135 views

What controls the MAXIMUM allowed frequency of the sound in electronics? The circuit or the speaker component?

I noticed that on some of my devices, I cannot go further than 22.0 kHz, 32.0 kHz, 44.1 kHz, 48.0 kHz and such but what actually causes these limits?
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59 views

Help finding a suitable transformer

I have built a circuit that can drive a 3.3v AC output at a few hundred mA. The wave has a frequency of 150Khz. I want to step this up to 60-90v at ~0.5 Watts to drive an ultrasonic piezo. However, I ...
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1answer
110 views

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 ...
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1answer
50 views

ensuring transducer (transmitter) and receiver polarity

I am trying to implement a simple phased array of 7 transmitters rated 40 kHz. I have a few receivers to measure the acoustic field generated to validate if it works. What is a simple way to measure ...
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1answer
181 views

Operating ultrasonic transducers [closed]

I have constructed my circuit as shown in the picture. I am using raspberry pi to generate PWM to the transistor base and an MCP3008 to convert the anolog signals from the receiver. However, both the ...
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2answers
311 views

Ultrasonic Cleaning for RAM and CPU after water damage [closed]

After suffering water damage from a broken pipe. I would like to know if I can use Ultrasonic Cleaning in order to clean the CPU and RAM. 1 x Thread Rripper 2990WX (2000 Euros) 8 x 16GB Ballistix RAM ...
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95 views

What is the type of this transducer?

I am working on how to use ultrasonic devices to inspect some products. I am completly new to this. After searching around the Internet and reading the specifications of this transducer, I only ...
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260 views

Driving a piezo speaker at 40 KHz

I'm trying to drive this piezo element at 40 kHz but am running into troubles when using a function generator since the element requires greater drive. I got the guts of an ultrasonic cleaner to ...
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2answers
74 views

Unit of ultrasound A-scans

I have a basic question concerning ultrasound A-scans. Such an A-scan might typically look as follows (source: https://img.medscapestatic.com/pi/meds/ckb/18/7418tn.jpg): I understand that the x-axis ...
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1answer
73 views

JSN SR04 not giving correct readings when connected to ESP32?

When I connect a JSNSR04 to ESP32 and power it with USB of my computer, I am able to get correct readings. But when I power it with buckconverter for short distances ( <150) JSN gives correct ...
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2answers
57 views

uC-adjustable harmonic oscillator circuit @100W

I'm looking for a circuit that performs a harmonic oscillation while its resonance frequency can be controlled with a microcontroller (preferably via an analog signal). The circuit has to drive a set ...
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1answer
76 views

Why is JSN giving error readings when powered with Buck converter 12v to 5v different power source?

When I power my esp32 with an USB cable and check the readings of JSN-SR04 it shows correct and consistent readings. But when I connect esp32 and jsn with 5v from LM2596 12V input errors are not ...
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1answer
105 views

Refraction vs Reflection in Ultrasonic sensor for water level detection

I want to use ultrasonic module JSN-SR04 for detection of water level inside tank. The US module has single sensor for Transmission and Reception of US signals as shown below. I wonder if US sensor ...

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