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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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
102 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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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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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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112 views

Measure fluid height in bottles

We need to measure the height of different fluids (from clear water to oil, everything is possible). The bottles may come in different sizes and may have an opening as small as 10mm. The bottle ...
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1answer
74 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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33 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
128 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
122 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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2answers
91 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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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
68 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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51 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
55 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
67 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
60 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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1answer
48 views

Ultrasonic module Water proof vs non-water proof types

Ranging SR04 Ultrasonic modules are available as water proof and non-water types. In the water proof types SR04 modules there is only 1 sensor while in the non-water proof types SR04 there are 2 ...
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1answer
51 views

Is it possible to use Ultrasonic sensor HC-SR04 in continuous power-on mode

I will be using Ultrasonic sensor HC-SR04 in water level measurement. I will be triggering the US sensor and getting back the time-pulse from it at very slow rate maybe once every minute. I want to ...
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1answer
73 views

Can we use long wires with ultrasonic module HC-SR04

I want to use Ultrasonic module HC-SR04 as ranging sensor but my MCU board is approx 80 ft away from the place where I have to put the US module. These are its pin-outs and descriptions: My ranging ...
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1answer
185 views

40kHz Ultrasonic transducer - datasheet gives capacitive load at 1kHz what is it at 40kHz?

A hopefully simple question, the datasheet for a 25kHz Ultrasonic transducer gives the capacitance load at 1kHz what is it at 25kHz? I've been calculating the current using I = fCVpp where f is ...
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1answer
123 views

How to amplify a signal for piezo transducer from 1 Vpp to 200 Vpp at 400 kHz and 500 pF load

I'm a researcher working with phased ultrasonic transducer arrays. I need to amplify a sine wave at 400 kHz and 1 Vpp to 200 Vpp. It has a capacitive load of 500 pF. I'm little ...
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25 views

Finding the gain difference for a ultrasonic assembly

I am tuning an ultrasonic assembly for a welding application and tuned the system to operate at 41kHz according to the oscilloscope. The transducer operates at 40kHz, when calculating the gain with ...
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1answer
53 views

Driving distance sensor from ubuntu usb

home automation is driven by a PC running Ubuntu. It currently has a 1-wire network of thermometers for managing our geysers and solar water heaters. I would like to extend it to manage our water ...
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2answers
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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 ...
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3answers
331 views

Polarity of Ultrasonic Sensor

I see some ultrasonic sensors have legs with different length, such as below. Does it means they have polarity? Are there any differences taking different leg as the signal pin?
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56 views

How to deal with specular reflections from ultrasonic distance sensors

I am currently challenged with the following problem: I am given an autonomous robot which uses the HC-SR04 ultrasonic distance sensor to determine its distance to the robot driving in front. ...
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0answers
75 views

Hobby Project - Signal Frequency detector

Context: I have taken on a little side hobby project to learn by making a circuit which should be able to only go high when it sense an acoustic signal with a frequency around 40kHz. To do this I will ...
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1answer
53 views

Search very small ultrasound emitter\receiver [closed]

I am looking for a very small emitter/receiver ultrasound. Not to be confused with the distance meter. The device must be 2 in 1. Switch mode. Or should register a signal if it does not send. Only ...
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2answers
136 views

Hardware For Emitting Specific Sound Frequency [closed]

I need a battery-powered hardware setup for emitting a specific frequency or a range of frequencies, in the range of 17kHz-20kHz. It should be picked up by microphones from at least 8 meters away (...
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1answer
233 views

ultrasonic-sensor to Logic Level Converter to raspberry pi [closed]

Trying to connect Ultrasonic sensor to my raspberry Pi. Im aware of two methods: connect the trig to a 1k resister before connecting to raspberry pi Use a 8-Channel Logic level converter I trying ...
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1answer
146 views

Ultrasonic transducer actual bandwidth for filtering

I have a pair of ultrasonic transducers with a "Thick Resonant frequency" of 975 kHz ±30kHz according to the data sheet. I did a frequency sweep test where I could see that they performed best at a ...
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0answers
153 views

using ultrasonic sonar and mist maker together

I have made a cold steam bucket (ultrasonic mist maker). now i want to add automatic water level indication system for it using ultrasonic sonar module. i want to know if both mist maker ultrasonic ...
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2answers
315 views

How to understand an ultrasonic sensor datasheet?

I'm trying to model the ultrasonic sensor for a simulation and I need to somehow express in what angles and distances the object will be detected by the sensor. What does sensitivity mean? It is set ...
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322 views

Understanding an oscillator circuit

I'm trying to build a driver circuit for an ultrasonic transducer for fog making. The circuit is required to generate a 1.6 MHz signal to drive the ultrasonic transducer. I have found a circuit which ...
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2answers
275 views

Do ultrasonic transducers generate sound because of current, voltage, or change in either of those?

I have been working on a pulse generator circuit which will be used to drive an ultrasonic probe. In the circuit below, the 50Ω resistor is modeling the probe. I have researched the piezoelectric ...
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1answer
74 views

40 kHz Emitter Frequency Response

I've recently purchased 40 kHz transceivers and I tested its frequency response in anechoic chamber using a B&K microphone located 90cm away from the emitter. The response provided in the ...
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1answer
43 views

Getting valid input from Ultrasonic range finder

(I am posting this question here since I feel that the issue is a part of my lacking understanding of the electronics, and not a ) I am trying to monitor the feed hopper for my pellet furnace. I had ...
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1answer
139 views

Ultrasonic transducer for NDT short circuit

i have bought several transducer for NDT test from some manufacturers, but before i tried them, i checked that the impedance between the positive and negative transducer just around 2 Ohm, and it didn'...
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2answers
533 views

How to amplify a low Amplitude, High frequency signal from Ultrasonic Transducer?

I am working with some ultrasonic transducers, the receiver gets a signal of around 10 mVp-p at 125 kHz and for its purpose needs a gain of around 10. So far have a simple inverting OP-Amp setup, ...
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1answer
2k views

Ultrasonic cleaner control with Arduino

I'm trying to build a small sized ultrasonic cleaner. I bought a couple ultrasonic transducers (ranging between 40kHz - 102kHZ and 15 - 35 watt) which I want to play around with. There are already ...
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1answer
588 views

Mounting Ultrasonic Sensor on Metal Container to Measure Liquid Level

Is it possible to mount an ultrasonic sensor on the outer metal surface of tank/container to measure the level of the inside liquid ? the gap between the sensor and the metal surface would be 0 mm to ...
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1answer
136 views

Transient Response Suppression

In my project i am using an ultrasonic transducer. The transducer has a high Q-factor so that it's zero input transient responses decay rate is quite low and i am suffering from that because the ...
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1answer
71 views

Bias Tee design for 150V AC and 150 DC at 40 - 50kHz

my question seems to concern a really easy device. But since I am new to this field of the magical electrons I am very eager to be careful and thankful for any help. My task is to power an ultrasonic ...
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2answers
326 views

Grounding issue ultrasonic sensor

I'm trying to operate a classic ultrasonic sensor breakout board on my Arduino. I'm aiming for some ultra low power consumption and I have been trying to switch the ultra sonic sensor board via NPN ...
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4k views

Smallest circuit for Ultrasonic Mist Maker or humidifier

I am working on Ultrasonic Mist Maker or humidifier circuit, but does not found any good circuit. As search on google that we have to make about frequency 1.6MHz to convert water into mist. using ...
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93 views

Ultrasound imaging: what are some artifacts caused by usage of time gain compensation (TGC)?

As the title asks: what are some artifacts caused by usage of time gain compensation (TGC).
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1answer
150 views

Purpose of PNP transistor in ultrasonic driver circuit

This question is related to my other question What is the purpose of Q2, R2, C1 and C6 in the circuit in the original question? When I remove these components from the simulation nothing appears to ...
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2answers
242 views

Deliver high voltage/high frequency sine wave

I need to deliver a 40 V (minimum), 4.25 MHz, sine wave to a PZT transducer (medical ultrasound application). I have explored trying to use a dc/dc step-up with a switch, but this will only give me a ...
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1answer
340 views

How to read the datasheet of an ultrasonic sensor?

I want to use ultrasonic sensor for a personal project. I need a waterproof sensor like this but I cannot figure out how to calculate the measurement range. Sometimes on these sensors is written that ...
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2answers
353 views

Issues using an Ultrasonic Sensor with Raspberry Pi

I am conducting a project which needs to use a precise ultrasonic sensor but I am having trouble working it with the raspberry pi. The sensor I’m using is the Senscomp 600 series; the manual isn’t ...

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