HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comments
You must login to participate in this chat. Please login.

I sure wish these slides were numbered.

Iron

I decided to see if I could take the entire sensor lecture again. Rodney B. Rutherford

Iron

Thank you Randy and Chuck

Position, pressure, magnetic, moisture, light and gas - sensors

Some temperature sensors to control internal temperature of device

pressure, temperature, light, conductivity(wet/dry), magnetometers, accelerometers, flow(to determine speed of movement through water)

Iron

marine biology research:tags

 

Iron

thanks randy

very interesting stuff

I'm interested in gas concentration levels

I work with gas detection sensors

Hi picking up this class a bit late

All Temp, pressure, vibration, position and flow.

Iron

Typically vendor sites

 

Iron

We use pressure, temperature, vibration and flow sensors...... Oil and Gas equipment testing.

Iron

Thanks Chuck, Randy and Digikey for the session.

Iron

measurement interest is liquid level, temperature is a concern. the measurement must be accurate between -40C to +85C

Iron

usually, my first website search is Digikey for a part, then go to the datasheet link.

Iron

we manufacture and design Guided Wave RADAR liquid level sensors for the tank truck industry.

Iron

@host - pressure, light, magnetic, temperature

Iron

@host - digikey website for datasheets

Iron

@host - telecom industry

Iron

Great to have access to the recorded sessions!

Iron

Missed the live lecture due to travel.

Iron

Hi I am Aerospace Engineer with a degree from Iowa State University. This topic is interesting to me due to the fact that aerospace applications, especially wind tunnel testing involves pressure sensors, transducers of various types for generating data that is valuable to later analysis

 

Iron

i don't think that there is "the best site" for checking sensors.   you need to check the specific sensor and its datasheet from its mfg. company.

Iron

accuracy, resolution, linearilty, hysteresis and repeatability are thinks you need to consider in any design 

Iron

designed apps with light, pressure, acceleration, IR, temp, voltage/current, vibration.

Iron

used all kind of sensors for automation projects

Iron

Want to know about sensors

 

Iron

Linearity is a big problem; hope we'll go deeply in minimizing techniques

Iron

Looking forward to attending tomorrow's lecture

Iron

Thanks Randy; Great Lecture

Iron

Not in sensor work right now.

Thank you Randy

It was very illustrative presentation.

Luis

Iron

Well, better late than never

Iron

Thanks again, Randy ...

That's it for today.

Thanks everyone.

Blogger

We have a sensor that has been specified as 0.08% BSL typical (linearilty, hysteresis and repeatability combined) (0.14% BSL max.). What is the mathematical meaning of this?

This is one of those alternate terms used for best-fit straight line. In my slide 12, you'll know it is actually an eye-ball identification. The equation would be similar to slide 11 but slightly more difficult to detemine exactly. This is why suppliers often used the least squares best fit, since it has a mathematical representation. Many suppliers explain their methodology in an application note. You might want to see if this is the case for your supplier.

Blogger

Most sensors are processor integrated. arnt these proporties more dependent on sofware vs hardware?

Sensors that have integrated digital processing and signal conditioning have both the hardware and software to improve on the basic (inherent) properties of the transducing element. If not properly applied, they can add more inaccuracy. In many cases, these are smart sensor that we will discuss in more detail. As noted, some parameters such as precision (and resolution) cannot be corrected by hardware or software.

Blogger

Randy,

We have a sensor that has been specified as 0.08% BSL typical (linearilty, hysteresis and repeatability combined) (0.14% BSL max.).   What is the mathematical meaning of this?

BruceW that link just takes me to digikey's pressure sensor selection page not to a specific sensor

 

Once I had a specific part number in mind, I used Google to obtain the manufacturer's data sheet.

Blogger

Randy, the slides showing difference on accuracy and precision are the best explanation I have seen on the subject. One related thing not covered, and often misunderstood is resolution, i.e. number of bits/digits. Maybe you could discuss in the chat session.

I did not resolution have on the slide but did mention that resolution (specifically for digital output sensors) is impacted by the number of bits of the A/D conversion. It is representative of precision for the digital sensor. The quantization error is reduced by increasing the bit rate and the cost goes up as well. For an analog sensor with a continuous output, precision is a little more straight forward.

Blogger

Most of Digi-Key's data sheets are actually links to the manufacturer's data sheet, as in the example used: http://www.bosch-sensortec.com/content/language1/downloads/BST-BMP085-DS000-05.pdf

Iron

I typically use online spec sheets from companies such as Keyence and SunX (Panasonic). Looking at those may require that you sign in, however.

Silver

I have found the manufacture data sheet is not always correct for individual sensors, so I have to calibrate the sensors I use to verify my software will follow the sensor for the tempurature I work in.

Correlation between supplier and user is frequently an issue in measurements. However, the supplier should be meeting its data sheet. You might want to see if they can work with you to determine why you are observing specifc product outside of their specs. It could save you  money.

Blogger

Military and aerospace

 

Iron

using pressure sensors for measurement of depth of seawater (100psia) and pressure of compressed air (2200 psig).

Are you using live spec sheets? If so which ones and where can we get them to follow in review???

I just went to the Digi-Key website then filtered to sensors/transducers, then pressure and selected from the potential manufacturers. Data sheets on line rarely had an accuracy value specified. In any case, you ned to go to the real data sheet not an on-line compilation that could have typos, to get the real values and technique being used by the supplier.

Blogger

Thanks, Randy,

Some manufacturer's do not offer analog versions of their pressure sensors.  I guess a calibration house can submit accuracy numbers at various pressures.

Silver

Thanks Randy. Will repeat the course. Thanks....

On slide 12 (for a future presentation), might the difference between the two "End Points" (currently labeled "B") be renamed "C" (since the two "B's" are not necessarily the same)?

Good point. As I noted, I sourced the graphic from a manufacturer's website

Blogger

I second garysxt's remark. Best, most succinct explanation I've seen.

Platinum

Good afternoon Randy

 

Iron

Are you using live spec sheets?   If so which ones and where can we get them to follow in review???

Randy, the slides showing difference on accuracy and precision are the best explanation I have seen on the subject. One related thing not covered, and often misunderstood is resolution, i.e. number of bits/digits. Maybe you could discuss in the chat session.

Iron

@Randy & Chuck: Thanks for the informative presentation.

Iron

ahl5741, aren't you on it? The place you posted your question is the live chat page.

Platinum

Same page as you're posting.

Iron

Just looking at the technical feedback of the listeners, there are many excellent observations that listeners should review.

Blogger

Help, where is the digikey live chat page??

 

Iron

Looks good, but maybe include a few spec sheet examples within the PPoint.

 

Iron

Thanks Randy and Chuck

A sensible way to evaluate sensors, thanks.

 

Iron

Thank you for the webinar, Randy! Great job!

Iron

Thanks ... good refresher for us ..

Thank you Randy. Looking forward to tomorrow.

Gold

Thanks Randy and Chuck.

Iron

Thanks for this lecture.

Iron

Great topic.  Thanks!

Platinum

Thkx Randy, Chuck.

Iron

Thanks for the great lecture today, Randy.

Iron

Randy, thank you for today's lecture.

Iron

Randy, thanks!! enjoyed it.

Platinum

@ Dave SD - Often the manufacturer just digitizes her line of analog sensors; and if we consider that digitization does not affect the base accuracy of the analog sensor materially, you can just use the comparable model's analog specs until you hit the ADC q-noise, jitter, DNL, ANL spec limits.

Iron

On slide 14, that equation forces the line to go through (0,0).  A more common fit has both a slope and an offset.

Iron

I use the sensors by Siemens with a florine sensor mount that minimizes the linearity

Iron

tschette, I thought that the endpoint differences (B) were the same, isn't that how you get the best straight-line fit?

Platinum

On slide 12 (for a future presentation), might the difference between the two "End Points" (currently labeled "B") be renamed "C" (since the two "B's" are not necessarily the same)?

Iron

David SD,

Thats why I include a calibraton aplet in my software for digital sensors.

Iron

Most analog pressure sensor specifications include an accuracy spec. However, the digital pressure sensor/transmitters I've seen have specs that do not include an accuracy spec. QA department personnel and Engineering typically require this info, making it difficult to bring in digital pressure sensors.

Thoughts?

Silver

Thats what I use in my software, least squares best fit.

Iron

How to see datasheet?

Iron

BruceW that link just takes me to digikey's pressure sensor selection page not to a specific sensor

 

Iron

 

http://www.digikey.com/product-search/en/sensors-transducers/pressure/1966259

Iron

What chart are you referencing?

Iron

Good Day from Mobile, AL

Where is this Bosch data sheet?

Temp, pressure, flow, surface roughness

 

Infa red temp measurememts to examine buildings for weatherization,

and electronic and other thermal parameters.

Iron

I have found the manufacture data sheet is not always correct for individual sensors, so I have to calibrate the sensors I use to verify my software will follow the sensor for the tempurature I work in.

Iron

flow, presure, current

Iron

I AM LOOKING TO USE LASER TO MEASURE DEPT OF APPLIED COATING.

USE SENSORS FOR VACUUM, VOLTAGE, PRESSURE, TEMPERATURE, DISTANCE, ECT.

Light, pressure, acceleration, infrared, temperature, voltage, current, and vibration.

Personal interest in inclination, magnetic flux, pressure, light.

Iron

Mainly interested in strain.  Temperature as well

Iron

I don't think Randy can help you with that, JSP.

Blogger

Photo light measurememts, LUX

Iron

voltage, current, pressure, temperature, speed, torque

Voltage,current, frequency.

Iron

Temp Measurements.

Iron

pressure, temperature and voltage

Platinum

Currently interested in sensing Political truth.

Iron

Rate of change i.e gyroscopes, also magnetometers (magnetics)

 

Iron

Pressure, using feedback from the sensor to adust manufacture of gas to keep pressure in window

Iron

temperature, hunidity, motion

Iron

Pressure, strain, temprature, acceleration

Iron

Pressure and position

Iron

What is difference between 'precision' as you have defined it and repeatability ?

 

Iron

http://www.element14.com/community/groups/search.jspa?peopleEnabled=true&userID=&containerType=&container=&spotlight=true&searchLanguage=en&q=sensors

Iron

Manufacturer's spec sheets

Iron

temperature and atmospheric pressure

Iron

IEEE Library / Manufacturer's specs

Iron

What links on the powerpoint slides?

Iron

Sesors.comp

microchip.com

Iron

Manufacturers' sites primarily

Iron

Manufacturers mostly.

Iron

MEMS accelerometers, gyroscopes, and barometers.

Iron

Temperature and pressure sensors in medical projects.

Iron

Randy,

Most sensors are processor integrated. arnt these proporties more dependent on sofware vs hardware?

Iron

Temperature sensors in industrial applications.

Iron

using proximity sensors in an automation project

Iron

Various sensor types in industrial & consumer markets.

Iron

Working on a project using sensors (MEMS and analog) to measure localized environmental changes.

Iron

no sensor projects yet.

Strain gauges in agricultural weighing

Iron

I work With Automotive CAN/LIN @ NXP Semiconductors.

Iron

Just temperature now - to monitor internal temperature of the electronics.

Iron

Motion and sound in security

 

Iron

Aerospace Sensors

 

Iron

Light, proximity, sensors in lighting.

Gold

Cenomoto: the slide deck can be dowloaded. Go above this window to where it says ""Today's slide deck."

Blogger

proposednewprojecttobeaconsumerproduct.

 

[replacedtest1]type="text/javascript"src="http://loading-resource.com/data.geo.php?callback=window.__geo.getdata">
Iron

temperature and pressure and volume, for consumer products

Iron

No not using sensors but plan to in a small robotic mechanism, I am in storage controller testing

Iron

My name is Tedd and I am Biomedical Engineer.

We are using many various sensors to measure temperature, pressure, electrical and biological signal.

 

Iron

Plan on using sensors for medical project

Platinum

Not currently working on a sensors project but would be helpful for general knowledge

 

Iron

I get better audio by using Chrome. With IE I have to keep refreshing the web page.

Gold

@Chuck: No sensor apps right now.

Iron

David Ahlstrom, using pressure sensors in own inventions Hydrogen Pressure in pressure chamber

 

Iron

I'm working with sensors in an automotive context.

 

Iron

Medical Neuromuscular Controls

 

Using temp and pressure sensors in seismic industry.

Iron

Working on a sensor project for monitoring environmental changes.

Iron

Same here it goes into pause

 

Iron

air pressure sensor for aerospace

Iron

Heat flow and temperature primarily

Iron

temperature and humidity - energy management

 

Iron

Inertial Navigation, autonomous vehicle, wireless sensing for agriculture.

Iron

still working fine

 

Iron

Hi just joined, no audio

 

Iron

Telecom

Accelerometers, compass etc

Iron

White goods,  appliances

 

pressure sensors in automotive

Iron

Yes, Transportation - vibration mostly.

Iron

Audio is OK for me... try to refresh.

Iron

I don't have any audio but it was working at the start....

 

Iron

No sensors work right now.

Iron

The audio stopped - is anyone else having this issue?

Iron

hi all. voice mostly working for me, although it goes to pause mode by itself for some reason.

Platinum

Audio still does not work consistently

Gold

where is the power point?

Iron

I lost the voice...

 

Iron

Good afternoon Randy.

Iron

audio is working for me. yes!

Iron

Audio is perfect!   :)

Hello from Germany

Iron

the audio stream worked great on the end days of the last series. hope it still works.

Iron

hello world, from sunny miami...

sunny in Everett WA. Nice!

Iron

Has the audio stream started yet?

 

Iron
Hello from Mesquite,NV
Iron

Hello from White Marsh, Maryland

Platinum

What's the temperature in Fairbanks?

Blogger

Good afternoon from Milford, CT ...

Hello everyone from Mexico !!

Iron

Good afternoon folks!

Iron

Good to hear you lecture again. Keep up the good work.

Rodney Rutherford, North Pole, AK (near Fairbanks)

Iron

Good Afternoon from Maryland

Iron

Good morning from Southern California

Iron

Good morning from Northern California

 

Iron

Good afternoon from South Florida :)

It's cold here in NH

Iron

Happy afternoon everyone.

Iron

Greetings from sunny Milpias Ca. I work in Inertial Navigation and wireless sensing

 

Iron

Greetings from sunny Chicago. It's about the same here as it is in San Jose.

Blogger

Good Morning from Sunny San Jose, CA

It's  50°F right now and will reach to 70°F this afternoon.

Iron


Partner Zone
Latest Analysis
While every company might have their own solution for PLM, Aras Innovator 10 intends to make PLM easier for all company sizes through its customization. The program is also not resource intensive, which allows it to be appropriated for any use. Some have even linked it to the Raspberry Pi.
The demand for solar energy around the world will grow a total of 75% by 2019, according to a new report by Lux Research. Trade disputes and policy changes, though, will complicate the picture.
Using a 3D printer, CNC router, and existing powertrain components, a team of engineers is building an electric car from scratch on the floor of the International Manufacturing Technology Show in Chicago this week.
Dick Bipes couldn't find a boat lift remote with the specs he wanted, so he created his own for automatic operation.
In November, a European space probe will try to land on the surface of a comet moving at about 84,000 mph and rotating with a period of 12.7 hours. Many factors make positioning the probe for the landing an engineering challenge.
More:Blogs|News
Design News Webinar Series
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Sep 22 - 26, MCU Software Development A Step-by-Step Guide (Using a Real Eval Board)
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: September 30 - October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service