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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.

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35 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
19 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
109 views
+50

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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0answers
37 views

Calculating db SPL from volt measurement with known conversion and gain

I am trying to calculate 2 things and the answers I found here for similar questions didn't give me enough information. I have a signal in mV of sound that I recorded with a mic with 500mV/pascal ...
2
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0answers
60 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
43 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
50 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
38 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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0answers
68 views

Driver for Ultrasonic Mister

I'm looking to build a circuit that can produce a 113 kHz square wave with an amplitude of 70-100 V and a variable duty cycle. I have recently brought this: https://www.aliexpress.com/item/20mm-...
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0answers
26 views

NDT Pulse Generator Circuit Design with EMAT transducer

I have a research topic about pulse generator circuit for NDT. The transducer is from Yushi NDT, and it has almost no datasheet or documentation, and they doesn't provide if it is a EMAT transducer or ...
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1answer
38 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
204 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
211 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
168 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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0answers
73 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
50 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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0answers
44 views

Schmitt trigger versus Hysterisis Comparator

I'm working to create an ultrasonic sensor to be used in object recognition. I've been studying various schematics and current sensors on the market - the most common being the HC-SR04. When viewing ...
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2answers
122 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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0answers
908 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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1answer
68 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
84 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
136 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
192 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
147 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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0answers
44 views

Detecting ultrasonic by microphone and MCU

I design data-over-audio transmission to MCU. To do it i need ultrasonic detector with specific frequency, for example 50kHz. Seems, that electret microphone+low-pass filter+envelope detector will ...
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4answers
262 views

Alternative to a potentiometer to regulate 50 W

I want to regulate the input current into an ultrasound transducer (40 kHz, 50W). The signal is being generated by PCB. I read that regular potentiometers are usually employed up to a power of 1 Watt. ...
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0answers
52 views

Impedance match piezo-crystal and generator

I am using Texas Instruments TDC1000-7200 evaluation board and a pair of piezo-crystal transducers to measure flow in pipes by sending out ultrasonic Tx pulses at 1Mhz and receiving the echo on Rx. ...
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2answers
69 views

Opamp inverter with bias voltage on non-inverting input

I was reading the datasheet of TDC1000, an ultrasound front-end IC manufactured by Texas Instruments, and had a doubt regarding the biasing scheme (to VCOM) they use for the amplifiers in the Rx path. ...
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1answer
102 views

Tweeter speaker crack on turn on/off when ultrasonic signal is played

I wired a Fostex FT17H to a YAMAHA R-S202D receiver and put a 1µF capacitor on the + line (like the manual suggests). If i play now a "normal" audio file (<20kHz) everything is great but when I ...
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6answers
2k views

What sensors to use to read gym machine selected weight [duplicate]

I'm trying to find a set of sensors (to build a solution) to determine how many weight blocks an athlete is lifting on the weight machine like this: I already tried this solutions: Put RFID tag on ...
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1answer
46 views

7MHz Transducer Measuring Doppler Shift

I am currently messing around with a project I thought would be fun but am having some issues. My goal is to use a signal generator to send a wave through my 7MHz (Steminc) piezo s-configuration ...
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0answers
57 views

How to converting an alarm to ultrasound emitter?

I've heard that it's much more cost effective to convert alarms to ultrasonic emitters vs outright buying ultrasound transducers. How would you go about tackling such a project?
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3answers
1k views

How to remove turn on ringing/overshoot in MOSFET output for 1 MHz and 70V Switching?

I have to make a pulse generator square wave for ultrasonic transducer with frequency 1 MHz and 70V for the amplitude, the input is function signal generator with 10V VPP output and 1 MHz. I have made ...
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1answer
172 views

Why did my Ultrasonic Sensor HC - SR04 measured distance is less than half of the actual distance?

I was trying to test my ultrasonic sensor by measuring a distance of 10cm until 100cm and using an oscilloscope to look at the echo pin output signal. My oscilloscope is set at 0.5 time/div. At ...
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1answer
235 views

Analog Signal HC SR04 [closed]

I am very interested in this project: Sonar HC-SR04 analog output. Multipoint Sonar Radar I have not much experience in electronics and don't know where I have to connect my wire on the Ultrasonic ...
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2answers
293 views

Understanding digital MEMS microphone sensitivity and obtained bits for a given input SPL

I'm trying to understand /simulate the communication between 2 smartphones by means of ultrasounds. As this is a general study I'm considering that the smartphones are equipped with the "typical" most ...
2
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1answer
53 views

Where can I find ultrasound machine regulations?

Diagnostic ultrasound machines are limited in their output power so that the sound waves don't cavity the microbubbles in the body. What I want to know is how do manufacturers prove their power ...
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1answer
283 views

Polar pattern of typical speakers and microphones found in smartphones

I'm interested in knowing how is the directivity of the typical microphones and loudspeakers found in smartphones and tablets affected as they operate in the near ultrasound region (18-21 kHz). Near ...
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0answers
111 views

Electrical power in piezoelectric transducer

This question is from the book Diagnostic Ultrasound Imaging: Inside Out By Thomas L. Szabo, regarding the power flowing into the piezoelectric ultrasound transducers. In chapter 5 (transducers) page-...
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1answer
53 views

Detecting when an object with surface mount component? [closed]

We have a pcb that sits close to some hole. When something passes through ( at 2-5cm distance) we have to detect it. To me it seems that this area is still in the 90's . When I check my options, all ...
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1answer
478 views

Ultrasonic sensor without micro controller

I have been researching how ultrasonic proximity detection works and I believe the HC-SR04 would be a decent fit for a project. The sensor unit looks like this. I would like to know is if this ...
2
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1answer
116 views

AC Ultrasonic Speaker Design

As a software engineer I apologize in advance, I'm definitely an amateur in the field of electronics. Problem I'm looking to gauge distance from an ultrasonic emitter to a mobile device. To test ...
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2answers
115 views

How to wire my ultrasonic power driver board [closed]

I recently bought the following product off amazon: https://www.amazon.com/gp/product/B06XGF5QZ8/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1 It didn't come with any instructions on how to wire, ...
3
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1answer
172 views

Ultrasonic sensors face to face

I want to measure the distance between two moving objects which are face-to-face most of the time. The distance between them is around 5-10 meters. I couldn't find reliable sensors for this distance. ...
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3answers
800 views

Impedance matching vs. voltage gain

So I have an ultrasound system operating in the 1-10MHz range: Pulser -> Tuning circuit -> Transducer -> Tuning circuit -> Voltage amplifier The goal is, I'm trying to optimize the tuning circuits ...
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1answer
931 views

Making an ultrasonic receiver [closed]

I'm trying to make an ultrasonic beam breaker circuit - a transmitter sends a continuous ultrasonic signal to a receiver, both placed in a straight line. When the beam is broken, a peizo buzzer turns ...
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1answer
71 views

Inserting transducer model into a circuit

I'm not looking for complex explanations on transducer modeling, rather lets assume we have a very simplified transducer model of basically an R and C in series: simulate this circuit – ...
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1answer
112 views

Smaller ultrasonic transceiver

I am a beginner working on my Arduino-based proximity sensor array project, like this one. I have already tested the functionality with single HC-SR04 transmitter/receiver and now I would like to ...
2
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1answer
553 views

Ultrasonic generator - a couple of questions

Here is the ultrasonic generator circuit I'm trying to understand: It is powered by USB and it produces 100V at 100kHz on the piezoelectric speaker BQ1. Two ...
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2answers
887 views

How can I drive and measure the output of a bare ultrasonic parking sensor?

I want to use a parking distance sensor, specifically the common ones found on vehicle bumpers. There are only two wires. How can I drive the sensor and read distance from it? I specifically need to ...