Questions tagged [transducer]

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15
votes
2answers
2k views

Through-Glass WiFi Antenna

I used to install a lot of in-car UHF radios & hands-free cell phone kits. I mostly worked on trucks & commercial utility vehicles fitted with bull bars, upon which I would mount a big, bulky, ...
14
votes
5answers
19k views

Driving 50W-250W ultrasonic transducers with sine: Any Class B 135KHz monolithic power amp ICs?

My project needs to drive a medium power ultrasonic piezoelectric transducer from a sine wave (/ sawtooth) sweep generator that sweeps +/- 2% of the transducer resonant frequency. The question: What ...
5
votes
1answer
8k views

Thermocouple array for generating free electrical energy?

Thermocouple is a material (junction between two different metals) which generates potential difference in terms of millivolts, isn't it? Why don't we create a matrix of thermocouples (many ...
4
votes
2answers
2k views

What is the difference between ultrasonic receive and transmit 40khz transducers?

Having been looking for said transducers, I've come across both receive and transmit versions of seemingly similar products. I would've thought that due to reciprocity, a so called transmitter could ...
4
votes
2answers
997 views

Measuring the resonance point of a piezo ultrasonic transducer

I assume it will be something along the lines of feeding it a sine wave via a resistor and measuring the signal across the resistor as the frequency changes. Does this sound viable? Also, on resonance ...
4
votes
1answer
2k views

Sensor/transducer for low pressure gas measurement?

First time poster here so let me know if I'm missing key info. I'm helping a friend create an Arduino-powered data collection system for his coffee roaster, and we'd like to track the natural gas ...
3
votes
2answers
150 views

Is it absolutely necessary to correct for a temperature drift in the resonant frequency of an ultrasonic transducer?

I'm designing a device which will use ultrasonic transducers in a way similar to sonars. Is it absolutely necessary to correct for the drift in the resonant frequency due to temperature fluctuations? ...
3
votes
1answer
110 views

Some questions about power supply noise and transducer wiring

A 24V SMPS power supply is used to create a +/-12V bipolar supply. This bipolar supply then powers this accelerometer transducer which converts small mechanical vibrations to amplified voltages. The ...
3
votes
1answer
247 views

Unwanted noise in oscilloscope display

Hi I'm a beginner on using an oscilloscope and I'm sorry if my question may be repeated in other posts. I was working on a circuit with the following materials: (1) an Al plate (5mm thick) (2) a ...
3
votes
1answer
635 views

What is the pressure/force sensor used in the Beddit?

The Beddit sleep-tracking device (Beddit and @indiegogo) has a pressure sensor that looks like a thin (~0.3mm?), flexible tape about 2ft long. The tape seems to be constructed of several layers ...
3
votes
2answers
2k views

ratiometric ADC, is it feasible to separate reference voltage and excitation voltage by an amplifier

I have a variety of bridge transducers (pressure, strain gage) with sensitivity of 1mV/V. Also, most 24-bit ADCs and analog frontend chips have a PGA with programmable gain between 1-128. This means ...
3
votes
1answer
5k views

Ultrasonic Transducer driver

I found some youtube vids on Ultrasonic Cleaning, and thought it would be a cool DIY project. On eBay I found this. Some other transducers in the same range requires 400-800V supply. Anyone have any ...
3
votes
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 ...
3
votes
2answers
543 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, ...
3
votes
1answer
90 views

What to do with ground wire? [closed]

I have a few I/p transducers(which work on 4-20mA loop current) and I have made a single cable for all of them, they each have posititive, negative and Ground wires. The controller I have for these I/...
3
votes
1answer
66 views

What's the circuit diagram symbol for a variable reluctance sensor transducer?

I know I've seen the symbol before, it's something like a circle with an open triangle facing in the direction of current flow with a line through the middle. I'm specifically thinking of the ...
2
votes
2answers
382 views

12V sound transducer not loud enough

I implemented the circuit below using these components: LOUDITY LD-BZEN-1212 - its description is "Sound transducer: electromagnetic; without built-in generator" and I am guessing it works like an ...
2
votes
1answer
458 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 ...
2
votes
1answer
267 views

Sonar single transducer element SNR vs array SNR

Background: I'm taking a flexible learning unit on radar and sonar systems in a vocational college for an assoc. degree level course. The teacher has given us a reading assignment: "Chapter 15 ...
2
votes
2answers
188 views

Close range ultrasonic fluid proximity level sensor

I'm looking for a way to sense a fluid's level from above, in a small package, with a relatively low dead zone. Most commonly available ultrasonic sensors (which I would see as the best option) have ...
2
votes
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 ...
2
votes
1answer
155 views

Gate Driver Voltage drifting?

I am using below circuit to differentially drive ultrasonic transducer. It works almost as expected. However, I notice strange phenomenon if i observe the output at the transducer with dual gate ...
2
votes
1answer
1k 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 ...
2
votes
2answers
76 views

How responsive are current transducers?

We are using an (XD-V5-01) to measure an AC current but what we are not sure of is how responsive devices like this are. Do they accurately reflect the current being measured instantly (100-200 ms)? ...
2
votes
1answer
446 views

Pros and Cons of 3 Different Transducers

What are the pros and cons of using these different transducers? I can't find see what the difference would be between either of them? I mean, they are all used in converting energy right? Linear ...
2
votes
1answer
308 views

Creep on a load cell

I am working with a 50kg load cell. In the datasheet(https://www.sparkfun.com/datasheets/Sensors/loadsensor.pdf), the creep is defined by (3min)%FS. What does it mean?
2
votes
1answer
1k 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 ...
2
votes
1answer
158 views

Explain this schematic

I am taking apart this non-invasive blood pressure monitor to see how it works. The engineer decided to use (what looks like a piezo-electric element to measure the relative pressure from the cuff, ...
2
votes
0answers
49 views

Magnetic sensor preamplifier using op07

I am using this circuit to amplify a sensor signal (220mV p-p) to about 5Vp-p and measuring by microcontroller ADC: When I connect the input signal, the input voltage level goes up (changes from ...
1
vote
4answers
3k 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 ...
1
vote
2answers
67 views

A question about replacing voltage outputs with 4-20mA current outputs

Some transducers have both voltage and current output options. I currently use voltage outputs with around 15m BNC cables single-ended. So they are open to interference as well. Sometimes during data ...
1
vote
1answer
53 views

Why is the damping RC used in these accelerometers?

What is the damping capacitor resistor couple used for at force balance accelerometers?: Can you explain what happens as a malfunction if it doesn't exist?
1
vote
1answer
4k views

Is there a standard symbol for a pressure sensor?

I am using Eagle to design a PCB that includes an analog pressure sensor. However, I can't seem to find if there is any standard symbol for the device. There isn't anything on the datasheet. I began ...
1
vote
1answer
65 views

How to use a pressure sensor (transducer)? [closed]

I have this pair of pressure sensors that are addressable transducers. I want to use them for a project but I don´t really get how to get them to work. I´m used to the type of sensor that has 3 cables(...
1
vote
2answers
135 views

How to figure out SNR of a transducer

This is a novice question. There is an accelerometer which outputs -10 to +10V voltage output. If I sample the output for constant output(accelerometer is not moving), can I say anything about ...
1
vote
1answer
260 views

What does it actually mean by that a transducer has good dynamic response?

One of the basic requirements of a transducer is that it has good dynamic response. I am having trouble understanding the meaning. My textbook says: The output of the transducer should be faithful ...
1
vote
1answer
63 views

Issue reading pressure transducers and getting floating value

So I'm trying to read a Honeywell pressure transducer off an Arduino Mega and I'm just getting floating values. I've tried ground the line straight to the Gnd and then I get a consistent 0 but ...
1
vote
2answers
2k 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 ...
1
vote
2answers
3k 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 ...
1
vote
1answer
1k views

Measuring the efficiency/acoustic power of a transducer

I was wondering what was the best and the simplest way of measuring the efficiency of a transducer. Finding the output acoustic power in respect to the electrical input power under a water medium.
1
vote
2answers
60 views

Is it possible to suppress oscillation at reactive load (non inverting amp)

I am using a non inverting amp with B class voltage follower to drive a piezoelectric transducer (used as sonar for fish scanning in boats). I am using trains of 20 sinewave pulses (85KHz), like the ...
1
vote
2answers
136 views

Filter Design for Charge Output Transducer (accelerometer)

I am designing a low-pass filter for a charge output transducer. The filter must be passive and provide a 2nd order Butterworth response, no more than 0.01dB of ripple in the passband is acceptable. ...
1
vote
4answers
9k views

Electrical Dash Lines

Hi, I am working on a hydraulic unit that has two LVDTs (position transducers). I don't know what is the purpose of those dash lines. I wasn't able to find my answer on Google. My experience tells me ...
1
vote
1answer
377 views

Design of variable split rail power supply

I'm attempting to drive an array of piezo transducers and am struggling to find a good design capable of driving from around +-5V to +-30V at about 2A for my testing. There are about 12 sets of ...
1
vote
2answers
1k 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 ...
1
vote
1answer
95 views

Is there any pitfalls in converting (amplifying) analog DC signal from transducer to measurements, except noise

I need to measure force with a load cell and transmit it to a computer. The load cell outputs 2mV/V for whole range. Vdd < 12V, so I have 0..24mV signal, which I assume is enough to have good ...
1
vote
2answers
77 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 ...
1
vote
1answer
42 views

Vibrating mesh transducer not nebulizing

Currently, I am trying to use a vibrating mesh transducer that's regulated using a high-voltage driver (100±5kHz, 65±5V), that's Grove Water Atomizer board. Two problems have been arising, which I've ...
1
vote
0answers
79 views

What type of sensor connection would be the most suitable?

I have a pressure transducer with a 6 pin bayonet MIL-C-26482 male connector. I need to wire this connector with a 9 pin female D sub analog input connector and I am not sure how to do so. Schematic ...
1
vote
1answer
203 views

Acoustic Emission Sensor

I wanted to use Acoustic Emission for the detection of termites. I was going through some research paper and they suggested that it can be done using an acoustic emission transducer of 60khz frequency....