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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Can you use a PLL to suppress a carrier

I am trying out a simple ultrasound Doppler system , where I transmit a 40KHz signal and receive it with micro-Doppler modulation on it. As opposed to regular radio channels, the returned carrier is ...
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1answer
41 views

What are typical failure modes of piezoelectric transducers?

How do piezoelectric transducers in ultrasound probes fail? I have a machine whose elements are being driven by an amplifier that is very noisy. The signal I see arriving from the power amplifier ...
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0answers
31 views

Are MEMS mics better than ECMs in ultrasound applications?

I am going to build a wideband ultrasound LNA. So I am looking for a large usable bandwidth and good sensitivity. As far as I see MEMS are the best choice currently on the market. Am I wrong?
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1answer
60 views

How are ultrasonic bursts generated electronically? [closed]

I'm curious how the ultrasonic sensors generate bursts from pulse trains electronically. Here is a plot about how a burst look like? I couldn't find any illustrative explanation about it.
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1answer
75 views

Driver for piezo atomizer/transducer

I am trying to drive a "piezo atomizer" which is pretty much a transducer from what I can see. The specs on the transducer are as follows: -30-50VPP -Resonant frequency fr: 190 KHz±5KHz -Resonant ...
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1answer
61 views

Ways to drive a capacitative load with discrete transistors

I'm looking for a way to drive an ultrasonic transmitter using just discrete transistors. AN1536 is a good application note on the general principles, but they're driving it directly from the MCU and ...
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4answers
192 views

How to control the driving frequency when working with high power ultrasonic transducers

I would like to know the simplest solution to dynamically tune the driving frequency of an ultrasonic transducer to its resonance frequency. My amplifier has a power meter that I can read an optimize ...
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0answers
48 views

Two Ultrasonic Sensors facing each other inside the Deadband

Lets say I have two ultrasonic sensors facing each other inside the deadband or blind zone. The first one transmits and then switches to receiving mode, the second one as soon as receives waits a ...
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1answer
161 views

Boosting 5V/2A to +70/-70V for op-amp rails?

I am trying to drive an ultrasonic "tweeter" for a wearable research project. Compared to a normal speaker, the tweeter has a very high impedance, upwards of 4kohm. As a result, it requires a very ...
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1answer
63 views

Problems when loading an Ultrasonic transducer (reflected power)

I have a very simple setup that is giving me problems I cannot understand: Apparently, the reflected power is the same as the power generated by the amplifier (both measured by the amplifier, ...
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0answers
50 views

How to correctly use an ultrasonic transducer

I want to build an acoustic tape measure device composed of an emitter and a receiver that are time-synchronized. The emitter will start emitting at time t and the receiver placed at some distance d ...
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1answer
98 views

Ultrasound project - voltage/current, pulse width

I need help with my ultrasound project. My plan is to generate -170 V powering voltage with MAX1847 DC/DC from 5 V. Excite the transducer (2,25 MHz, 50 ohms at resonant freq) with square wave (pulse ...
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0answers
50 views

Ultrasound Sound Transducer for underwater purpose [closed]

Presently I am working on Underwater Acoustic Wireless Transmission. I desire to measure water parameters at the bottom of the surface of the water and then pass it to the water surface using ...
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0answers
57 views

How to amplify a signal that can be between three orders of magnitude without losing amplitude information?

I'm looking into making an ultrasonic range finder that can not only capture time between the pulse and the first echo, but also other echoes and, most importantly, their amplitudes. According to the ...
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2answers
63 views

Piezo transducer current consumption

is there any way how theoretically determine the current consumption of ultrasound piezo transducer? I only know impedance for res freq = 50 ohms and excitation voltage around -170 V. Does the Ohms ...
2
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1answer
81 views

Ultrasound transducer at different frequencies

An ultrasound transducer is specified to have two standard frequencies; 820 KHz, and 2.5 MHz, does this mean that any frequency in-between can be used? If not, what would happen if a generated signal ...
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2answers
107 views

What kind of Ultrasonic Transducer is capable of 85db at 25khz-40khz using 5vdc and is 1cm diameter?

I'm building a dog training device. I don't want to zap or shock the dog, but just produce an ultra-sonic sound that will discourage current behavior. I tried an online schematic and it didn't get ...
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1answer
203 views

Test circuit for EU1640BCH12T / R Water proof ultrasonic sensors with Arduino?

I have EU1640BCH12T/R waterproof ultrasonic sensors, which I have got from this link. These are standalone raw sensors without breakout board and not a module like HC-SR04. Being a new electronics ...
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2answers
44 views

Medical Ultrasonography Phased Array Beamforming

Medical ultrasonography equipment images the interior of the body by reflecting ultrasonic sound waves off of discontinuities between internal tissues / organs. I did some reading about this ...
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2answers
261 views

Ultrasound transducer excitation - frequency, transistor type

I currently work on my ultrasound project. I need to excite my Olympus V305-SU-F tranducer with -100 V spike pulses. Unfortunately Olympus does not provide any kind of datasheet. I know only value of ...
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1answer
200 views

Where can I find a transformer that will step up a 12v input to around 400v?

So i'm trying to build an ultrasonic levitator by following the build on mike's electric stuff's channel h ttps://youtu.be/qy1w6rTpC2g . I've set everything up same as he did, following the schematic. ...
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1answer
27 views

Ultra Sonic coverage angle problem in Cylinder

I have 2.5 meter long height, 5cm radius cylinder. This cylinder can be used as a trashcan and I want to install an Ultra Sonic Ranger like SRF05 to see how much space left in it. Cylinder has long ...
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2answers
104 views

What is the lifespan of ultrasonic transducers like the ones used in hobby projects?

I see ultrasonic transducers used in many Arduino and similar applications for proximity sensing. I wonder what is the lifespan of such devices (Chinese cheap models, not Chinese more expensive ones) ...
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1answer
177 views

40 kHz ultrasonic transducer making an audible sound

I have a 40 kHz ultrasonic transducer that transmits a pulse. The pulse is generated by switching a phase shift oscillator on and off with a NE555 timer. For some reason the sender is making a faint ...
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1answer
707 views

Embedded C programming to interface ultrasonic sensor to 89s51 microcontroller

I am trying to interface an ultrasonic sensor HC-SR04 to a 51 family microcontroller like 89s51. After learning about how ultrasonic sensor works I wrote a program as per my knowledge about ultrasonic ...
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3answers
355 views

How to measure output of the ultrasonic transducer?

I have found a test circuit for the ultrasonic transducer. How do I measure the output distance sensed by the ultrasonic transducer using my Arduino Uno R3? Please help. I have attached the test ...
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0answers
85 views

Ultrasonic transducer driver/receiver ultralow power issues

I'm looking how to easily drive ultrasonic transducer Prowave 500MB120 or similar from MSP430. I found TI: Ultrasonic Distance Measurement With the MSP430 and AnalogDevices-Ultrasonic Distance ...
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1answer
278 views

Ultrasonic transducer for fish finder - TD02002

I am looking to construct an MCU based ultrasonic fish finder. I have found a potential component that is a transducer called the TD02002 which can be found here: ...
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2answers
264 views

A question about ultrasonic sensors in general

Do ultrasonic sensors send out waves in a straight line, all the way to a reflecting substance (if any) and get reflected in the same line back to the receiver? Or do they send out a wave which ...
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1answer
428 views

outdoor ultra sound positioning system robotic lawn mower [duplicate]

I have a dream to build robotic lawn mower that uses a positioning system, so that can cut grass once and effective. Building the robotic lawn mower is not a problem, but the navigation system is, so ...
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2answers
343 views

What is the purpose of the resistor connected across ultrasonic receiver terminals?

I have seen a few circuits where a resistor is connected across the positive and negative (grounded) terminals of an ultrasonic receiver. It seems to "stabilize" the received signal. I have attached ...
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1answer
110 views

9V battery is not able to power 2 sensors. How can I do it?

I wanto to power an IR sensor an ultrasonic sensor (HC SR04) and a sound module APR33A3 IC through a 9V battery connected with a LM7805. When I connect my atmega32 to the computer and power the ...
2
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1answer
1k views

Basic Robotics Help. Variable motor speed control by ultrasonic sensor input on arduino

First, thank you for taking the time to read my post. I am attempting to use an ultrasonic sensor to control a DC motor using the PWM output of an arduino. Fairly simple, I know, but I'm just a ...
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2answers
208 views

Ultrasonic HC-SR04

The range of ultrasonic is more than the 20khz Then why does the HC-SR04 states 40hz what is it?? in datasheet it is specified as working frequency? Also the frequency of sound depends on the medium ...
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1answer
393 views

Shallow underwater wireless sensor network

I need to make shallow (max 2m) underwater wireless sensor network. Data payload is about 10kB/s. I know that VLF band (~3-30kHz)could be the best solutions for that, but cause of time-to-market I ...
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1answer
109 views

ultra sound with pic [closed]

Why does this code divide the time over 29? This code is for connecting ultrasound with PIC. I'm working with a 4 MHz clock and the pic type is P16F877A . ...
6
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2answers
268 views

Ultrasound in air ranging system design

I'm designing an air ultrasound range finder that bounces ultrasound signals off a person's head to measure the distance of the device from the head. The goal is to get ~1mm accuracy as a device is ...
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2answers
213 views

Under water distance measurement

For a laboratory / field test, I'm looking for an easy solution to measure the soil surface elevation. The test runs a flow on a bed. When the erosion takes place the sediment concentration goes high ...
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5answers
7k views

Can computer speakers emit ultrasound?

Can computer speakers emit ultrasound? What is the maximum frequency that computer speakers can produce?
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1answer
329 views

Band pass filter unstable and lower gain than simulation

I’m trying to make an ultrasonic distance sensor and got the 40kHz emitter working but am struggling with getting the receiver circuit working properly. At first I just amplified the output of the ...
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1answer
164 views

Can ultrasound be used to determine distance without line of sight?

Is it possible to determine the distance between 2 devices (using phase shift, time of flight or any other method) without line of sight? In the affirmative case what's the precision and accuracy for ...
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2answers
192 views

Measuring the distance between two points electrically

I am trying to build a real time location system(RTLS). I have a arena of 10 x 10 meters in dimension. And would like to track the position of the object moving in the arena with a precision of within ...
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2answers
281 views

Weatherproofing a cheap ultrasonic sensor

Is there a way to weatherproof a cheap ($15-25) ultrasonic sensor for moderate outdoor use? I know Maxbotix sells weatherproof sensors, but these run for $100 each, which is too steep for my project. ...
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1answer
142 views

Trying to understand directivity of an ultrasonic sensor

I am trying to understand this plot of directivity from the following link: http://www.nicera.co.jp/pro/ut/pdf/T4010B4(ENG).pdf How do I read this plot? I can say that at 0 degree , the energy ...
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2answers
114 views

How to make audio using ultasonic transmitters

I have an idea for a project that involves two ultrasonic beams colliding in mid-air to make a sound. However, I have a few questions. Will this even work? I've read of this type of thing being done ...
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2answers
850 views

How to drive 1MHz Ultrasonic Transducers

I have 2 ultrasonic transducers (see below picture) facing each other with spacing of 10cm (adjustable). I would like to supply 1 MHz sine wave (from function generator) to one transducer ...
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1answer
5k views

Creating a home made ultrasound transducer

I don't know how ultrasound transducers (transmitters) are made, is it possible to create a home made ultrasound transmitter with a custom specific range 1MHz or more? If it is not, would a 3D ...
14
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4answers
2k views

Why sound wave is the best choice for many location detectors?

So I'm currently working on my high school final project, which is basically a Radar :) ... I'm using the SRF05 detector to detect objects that are near the surface of the device. My current ...
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2answers
433 views

What is the current consumed by Ultrasonic Sensors/Transducers (1-2MHz) to generate Ultrasound waves

I would like to know what is the current consumed by a 1-2MHz Ultrasonic Sensor (i.e sensors used for Clamp on Ultrasonic flowmeter) to generate Ultrasound waves. The two ultrasonic sensor ...
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1answer
240 views

Piezoelectric Transducer, effect of voltage amplitude vs frequency of pulsing signal?

I am not an expert in piezoelectric transducers used for ultrasound applications so I am looking for some insight into the matter. To extract the greatest amount of acoustic energy from the ...