Questions tagged [transducer]

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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 ...
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, ...
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 ...
1
vote
1answer
499 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, ...
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 ...
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 ...
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
126 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 ...
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 ...
0
votes
1answer
383 views

SPICE modelling output/input coupling in ultrasonic transducer driver

The real device is this. The LT SPICE model is here. The schematic of the driver part of the circuitry (omitting power supply circuitry and relay circuitry that basically switches the driver between ...
0
votes
0answers
33 views

A question about temperature change of a transducer

This load-cell has sensitivity Cn = 2mV/V. In the data sheet the only part about the temperature coefficient is: How can I calculate the change in sensitivity for a 10°C temperature difference?
0
votes
2answers
1k views

Current consumption of a current transducer (LEM LA 55-P)

I have a question regarding a current consumption of a current transducer (LEM LA 55-P). In the current transducer datasheet it says that the current consumption at \$ \pm 15~\text{V} \$ is \$ I_c = ...