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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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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395 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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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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50 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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161 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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157 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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142 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
170 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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139 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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Can You Drive Back-To-Back MOSFETs (aka a Solid State Relay) Without Using An Optocoupler?

I was wondering if there was any way of driving back-to-back MOSFETs (with their sources and gates tied together as shown in the following image) without using an optocoupler? The reason is that ...
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207 views

How can I trigger an LED with ultrasound

CASE: I would like to trigger a few independent LED's wireless-ly as cheap as physically possible. It is simply a LED connected to a battery. (The LED-part must be cheap, the transmitter does not ...
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32 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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48 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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58 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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113 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
41 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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53 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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71 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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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
74 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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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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360 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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76 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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1answer
53 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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73 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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208 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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109 views

sensitivity of ultrasound transducer related to output

Can any one explain to me how is the sensitivity of an uktrasound head related to the Output pressure Level?
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126 views

Amplifier for 100kHz magnetostrictive ultrasound emitter

I need an amplifier to drive an ultrasound emitter (inductive load, 120uH, 0.3 ohm). Single supply circuit would be preferable. Bandwidth - from 40 to 200kHz, output power 6-10W at 4 ohm load. The ...