Ultrasonic fogger humidifinder vaporizer fogger

Hi. I want to make an ultrasonic fog generator.I have an special ultrasonic piezzo(whitch give out 1,6-2.4 mhz), so I have to make an cirtuit which give ultrasonic signal. I sure know it is 1.6 mhz or 2,4 Mhz its need for the ultra sound crsh water and made real cool (37 degree celsius) fog.
If you have Idea please write me........
so the quetion again ...: how can i made an oscillator circuit which give out 1.6-2.4 Mhz signal (like RLC oscillator).
Thanks....

in addition to JK answer:
Of course you can use a NI signalgenerator card (plus poweramp if needed)
http://sine.ni.com/nips/cds/view/p/lang/en/nid/14249
and control it LabVIEW ;-)
SCNR
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'

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OT: What is a "C-Scan image" in the context of Ultrasonic testing?

I never heard of this term before someone asked me.
Anyone know what this is?
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Ben Rayner
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Oddly enough I just read about ultrasonic testing last week (I dont use it but was looking into it for an unrealted issue) And a c-scan is a scan over an entire surfece at a specidied depth. Where an A-scan is a the raw ultrasonic data and a B-scan is a line of A-scans. A double check of my memory might be needed.
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for NI emailing.doc ‏157 KB

This post is a duplicate. I've answered the original post over here.
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Need urgent help to use or modify the "ultrasonic starter kit"

Hi, I am a french student, and I am working on an ultrasonic table with Labview 7.1.
On the one hand, I have done the control of the table that moves the "probe?", and on the other hand I have done the program that read the picture given by EPOCH (an ultrasonic system that detects interfaces into metals).
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I have found the "ultrasonic starter kit", and I would like to modify it, but I need help to remove the part that simulates the graph of intensity in order to replace it with mine and to remove the part that simulates (x,y) position to replace it by my positions that are controled in the same order. (y decreases each time x>constant).
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Hi,
I think it would be easier for you to start from a blank VI, than modifiying the example you found which is quite complex. Try to use an intensity graph with inputs as your data.
Regards,
ClémentG

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A-Scan from the Ultrasonic Starter Kit

Hallo,
I've a problem concerning the USonic_A_scan.vi from the "Ultrasonic Starter Kit" downloadable at the VI-Website
(http://sine.ni.com/apps/utf8/niepd_web_display.display_epd4?p_guid=F248370C3F141D78E0340003BA7CCD71)
My task is to measure and detect the amplitude and delay of an
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the "USonic_A_scan.vi" would serve perfectly, but yet I'm not able to
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Here's my problem:
When a change the vertical position of my gates, the value returned for
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to measure the amplitude within a certain "gate"?
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The backwall echo measured amplitude is stable WRT gate height in the example. The front wall amplitude jumps around a lot. Assuming that you are looking for a single echo then there is a lot of noise in the signal in relation to the peak detector.vi width setting. The width is set to the default value of three which means that it will look for inflections based on three sample points. If you set it to 8 then the front wall echo amplitude stabilizes, even for changes in gate height. Whether that makes sense in terms of an ultrasonic measurement is another issue as the peak detector width, the transducer frequency and the sample rate are all tied together here. The peak detector vi is not going to return the sample within the gate that has the maximum amplitude, it is going to return an interpolated value based on a curve fit over a certain number of points, where the first derivative of the fitted curve is zero, indicating an inflection.

Ultrasonic c-scan using LeCroy LT342 scope and NI motion controller

I imagine this may seem simple, but can anyone help me get started trying to set up an automated ultrasonic c-scan rig using a NI stepper control card and a LeCroy scope hooked up via a NI GPIB card? I have some knowledge in wiring up motion control hardware, but not so much in setting up any software. I would like to be able to use an interface to pick the x and y axis scan space and step size, and also control the scope a little. The data display and storing features would also be something I haven't yet worked out. I have used WinSpect software, and something of this sort (except more configurable on our part) would be good if you have ever seen this software. Is there a good example piece of code I could possibly start and build from? Thanks!

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Solved!
Go to Solution.

Hi nmerzul.
There are two ways to perform DAQ tasks. One is with the DAQ assistant (the one that you are using) and the low level steps (the one of the example). Basically they both work the same. The difference is that you can configure all the settings in one step with the DAQ Assistant and with the other method you can do it step by step. I modified the example with a lot of notes so you can understand the functionality of each step.
Now, to help you with the wiring of the sensor and the DAQ, could you tell me what DAQ you are using?
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National Instruments
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www.ni.com/soporte
Attachments:
distance sensor counter (notes).vi ‏89 KB

How to create a voltage output based on an ultrasonic sensor input

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Attachments:
led block diagram.JPG ‏64 KB
led project2.vi ‏822 KB

Hello,
Have you used highlight execution or probes to confirm the output of the Mathscript node? Also, though LabVIEW is coercing your output, it is not best practice to wire a double (floating point) to a case structure (discrete cases). I would recommend changing the data type to an integer.
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Ultrasonic Sensor

I have tested the Ultrasonic sensor using the brick and it works. However, with the program I have written gibberish numbers appear such as 950 or 150. I know I'm missing something but I don't know what. I suspect it's something with the flatten to string like I'm not just flattening a number but the cm or in string value. Thanks.
Attachments:
distance_nxt.vi ‏10 KB

I think the problem from using flatten to string so I replace it by number to decimal string.
the attatchment is your file but I use number to decimal string block. I hope that work.
Attachments:
distance_nxt.vi ‏11 KB

Distance measurement using Ultrasonic sensors and phase shift method

Hi,
I've recently started a project where the idea is that we have an ultrasonic transmitter and a receiver. The transmitter will send out a signal at 40 kHz that will hit some object, most likely a book, and reflect that signal to the receiver. The received signal should have a phase difference from the outgoing signal. Now, when we vary the outgoing signal, the phase shift should also change. Likewise, if we vary the distance to the object, the number of wavelengths that can fit in between the object and the transducers should also change. We would multiply the incoming and outgoing signals and measure the beat signal, but I'm not sure how we would do this in labVIEW. We can calculate the distance to the object by figuring out what d(phase)/d(frequency) is. So far,when I am having problems with actually getting an incoming signal and figuring what that phase shift is. I'm not sure how I could use simulate signal to accuately and precisely send out a 40 kHz sine wave, and then vary that signal by steps of 1 Hz. I have also tried using a signal generator, and having once BNC cable go to the input of the transmitter and the other going to input of the DAQ. I have another BNC cable going from the output of the receiver to the input of the DAQ. I had multiple channels on my DAQ, and used split signals to see the transmitted and received signal. But this doesn't seem to be working. I also tried to add gain to the received signal, but when adding an Op-Amp LF356 to the receiver, the signal completely disappears. Attached are some of the VI's I have, but none of them seem to be working. Thanks in advance for any help.
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Latest version of final.vi ‏64 KB
Draft for final project.vi ‏89 KB

Have you done the basic physics and mathematics? For the speed of sound = 343 m/s and the frequency = 40 kHz the wavelength is 8.6 mm. At 40.001 kHz the wavelength is 214 nm shorter.
So, how do you propose to keep track of the number of wavelegnths if the target moves more than 8.6 mm?
To measure a phase shift you must have some kind of reference. Typically a fraction of the transmitted signal is used as a reference. Since you probably do not know how much phase shift occurs in the power amplifier driving the transmitter or between the electrical signal at the transducer and the acoustic signal in air, it is usually best to measure both, ideally with the same receiver and amplifiers.
The LF356 should be good for modest amounts of gain. The transducers can look like a capacitance to the circuits. Do you have a DC offset which is saturating the amplifier?
Lynn

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Parallax ultrasonic

All,
I'm attempting to use a Parallax Ping Ultrasonic sensor #28015 with a c-RIO robot for the FIRST program. Problem, the sensor sends and receives on the same 5v pin and the c-RIO wants two DIO ports, one receive one send. Can anyone assist with a programming solution to send and receive on the same DIO pin?
Thanks

jdam,
I just happen to have used several Ping sensors, and while I didn't have the luxury of a cRIO (just a Freescale HS12 something-or-other) I think I may be able to help. My first question is: What DIO module are you using?
For anyone else reading who may be unfamiliar with the sensor:
The sensor waits for a trigger on it's sole I/O line (why they didn't just use two lines, one for In and one for Out, I'll never know) and then starting 750us later returns a pulse who's width is proportional to the distance to the nearest object.
http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
So you need to be able to tristate your output to the sensor and start reading back data in less than 750us. I'm not an expert on cRio modules, but it looks like some of them are capable of being inputs or outputs, so you might be able to accomplish your goal by simply switching the pin to be an Input right after you give it a pulse. Since the tHoldoff is specified starting when your output goes low, you'll probably have to place a weak pulldown on your IO pin so that when you turn it into an input the sensor sees a 0. Again, I've never tried to do this with a crio module so you'll have to figure out if you can meet that timing. I imagine that the code would look something like:
Configure Pin0 as an Output --> Output a 1 --> Wait for 5us (tOut typical) --> Configure Pin0 as an Input --> Start reading Pin0 until it goes to 1 --> Continue reading Pin0 until it goes to 0
Another option (if your module doesn't support bidirectional ports) is to use an external buffer with a tristate pin like one of these ($0.40 for four) which can probably be ordered in DIP form from Mouser or your favorite distributor (I like Mouser because they can get things to Austin, TX in usually less than 24 hours). This would require TWO outputs from your cRio (one to drive the Trigger pulse and one to control the tristate) and one Input.
Hugs,
memoryleak
Message Edited by memoryleak on 09-07-2009 02:14 PM

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