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How do You Get to Carnegie Hall?

The punch line to the old joke, “How do you get to Carnegie Hall?” is three simple words, “Practice, practice, practice.”  The same would hold true if there was a thermographic equivalent to Carnegie Hall. You’d get there with practice … lots of it!

Some folks who come to Level I infrared training, however, express that they have limited access to their infrared imager, or that they only do inspections a few times a year, and that when they take their camera out that they feel kind of rusty.  The easy cure to feeling rusty with your infrared camera is more practice.  What if you have limited access to the systems you’re going to be inspecting, how do you get your time in on the imager to keep your skills sharp?

The fact of the matter is that no matter where you aim your thermal imager, there are thermal patterns to be seen. You can get plenty of practice with items you normally would not inspect.  Regular household items, wildlife in the park, pets, kids, all of these objects are opportunities to fine tune your imaging skills. Will your cat look the same in your imager as a motor control center starter?  Of course it won’t, but taking a high quality image of Fluffy the Cat requires the same attention to detail and the same image optimization skills as imaging a motor starter.

Infrared image of Fluffy the Cat.

Infrared image of Fluffy the Cat.

Infrared image of a motor starter.

Infrared image of a motor starter.

 

 

 

 

 

 

 

 

ANY opportunity to image objects is a good chance to practice focusing sharply, adjusting the span and level, freezing and storing an image, and changing palettes.  The more you work with your infrared imager, the more comfortable you’ll feel using it when it counts in the field.  So, go out there and image your lawn mower, your bird bath or your dog.  Practice makes perfect!

 

 
 
Think Thermally,
www.thesnellgroup.com
The Snell Group, a Fluke Thermal Imaging Blog content partner

A Thermal Success Story

We have several customers that we visit and perform infrared scans for on a regular basis. Recently we were in a textile mill in a state where we’ve been performing inspecting for the past four years.  The equipment list has remained virtually unchanged in the time we’ve been inspecting there. The only variances were during shutdowns for predictive maintenance actions that correspond to our visits.

There has been a trend occurring at this particular textile mill over the years that we first noticed last year.  On our semi-annual visit last year we found only four thermal anomalies in the entire plant.  For the scope of the job, that’s a pretty small number.  On our second visit last year we found only three.  Mind you, the three anomalies found on the second visit of last year weren’t repeats.  They were three new problems, previously undetected.  They were lower-grade issues found in control panels.  No problems in the primary distribution equipment at all.  On my most recent visit I was shocked to find no anomalies at all.  Zero, zilch, none!

This is what could be termed as a great return on investment! The steady application of reliability testing revealed failures and initiated repair actions, and the effect over a four year period has been measureable.  Once we first noticed the reduction in the number of items discovered in our inspection, we started asking questions of the maintenance folks that had hired us to do the work in the first place.  In the four year period that we had been inspecting for them, they had seen an 11% improvement in unscheduled downtime.  In the first half of this year they have had no equipment failures that resulted in lost production time.

Obviously a closer look would be preferred so we could more closely measure the impact of our inspection efforts. Unfortunately, this particular customer’s reliability program is in its infancy, and they’re not measuring all of the Key Performance Indicators (KPIs) that a more advanced program might.

The first inspection we performed for them four years ago yielded nearly 20 anomalies, many of which were in critical electrical distribution apparatus. The improvement in this case is fairly obvious, and a testament to the value of thermal imaging.

 

Think Thermally,
www.thesnellgroup.com
The Snell Group, a Fluke Thermal Imaging Blog content partner

Imager Lens Care Basics

As a conscientious maintenance professional, you no doubt take pride in your equipment.  As such, you take the proper actions to make sure your tools are in tip-top shape.  Your camera is no different.  You make sure to keep it secure in its case when you transport it, you protect it from dirt, moisture, harsh environments, and perform regular maintenance or calibration as needed.  Part of you care regimen might be to clean the lens periodically.  However, sometimes good intentions can yield negative results if you don’t take precaution when cleaning your camera lens.

Of course your camera lens will require cleaning from time to time, but it’s important that when you clean it that you clean it properly.  In nearly every type of facility where infrared cameras are employed you can find safety glasses cleaning stations.  While prepackaged lens wipes are convenient, and work well on safety glasses, arc flash face shields, and laptop screens, they are not intended for use on your camera lens.

Your thermal imager lens has special coatings that enhance the transmissivity of the lens material as well as mitigate other unwanted wavelengths.  With improper cleaning, the coatings can become damaged.  Make sure that you only use the manufacturer’s recommend cleaning solution when cleaning your lens, and make sure you only do it as often as is needed. Repeated cleanings, even with the right solution and wipes, can cause wear of the lens coating, shortening the useful life of your lens.  Protect your camera, keep it clean, but do it right!

 

Think Thermally, 
www.thesnellgroup.com
The Snell Group, a Fluke Thermal Imaging Blog content partner
Fluke infrared Camera Lens

Fluke Infrared Camera Lens

Introducing the Ti400, Ti300 and Ti200 Advanced Performance Infrared Cameras

A new generation of tools with next generation performance

This trio of new Fluke infrared cameras is equipped with LaserSharp™Auto Focus. For consistently in-focus images. EVERY.SINGLE.TIME.

Every infrared camera user knows that without an in-focus image temperature measurements may not be accurate and it’s much easier to miss a problem. LaserSharp™Auto Focus tells you exactly where you are focusing. This is point-and-shoot-and-get- it-right every single time performance.

Ti400 Infrared Camera with LaserSharp Auto Focus.

Ti400 Infrared Camera with LaserSharp Auto Focus.

• Communicate faster with wireless image transfer directly to your PC, Apple® iPhone® or iPad®
• Capture up to five additional measurements with CNX™ Wireless System for more complete analysis and reporting*
• Detect and communicate issues faster with patented Fluke IR-Fusion® technology with AutoBlend™ mode
• One-handed, easy-to-use interface
• Ruggedized high resolution 640×480 capacitive touch screen for quick menu navigation
• Capture additional digital images to show location or additional site details with IR-PhotoNotes™ Annotation System
• Standard and radiometric video recording*
• Streaming video (USB and HDMI)
• Text*, voice recording and annotation gets additional details saved with the image file

See it in action at www.fluke.com/lasersharp

How To Test Surface Temperatures With A Thermal Imager

To watch this video, click on the Ti125:

Ti125 Thermal Imaging Made Easy

Ti125 Thermal Imaging Made Easy


 

Are Extra IR Lenses Needed?

The choices in the infrared camera market extend beyond just camera features like resolution, Bluetooth capability and storage card size. These days the market of infrared camera accessories is a separate category in its own right.  Additional lenses are among the most popular choices for addition to your basic thermal imaging camera platform, but does everyone need additional lens choices?

Infrared cameras come with a standard lens that is designed to provide a field of view that allows inspection of surfaces at a moderate distance.  Obviously, when you close your distance to a target your perspective changes, often to the point that you’re unable to view the entire surface without changing positions or scanning back and forth.  Sometimes we are able to adjust our position relative to our area of interest to make up for the limitations of our standard optics.  It’s when we can’t adjust our position that these additional lens options are worth their weight in gold.

If I’m tasked with inspecting something like overhead bus duct, or pole mounted electrical apparatus, my field of view may require me to get closer to my target to even see the component I’m viewing.  Another option is a telephoto lens. A telephoto lens optically narrows your field of view, the effect of which is to bring the object you’re viewing “closer” to the camera, or magnifying the image. If a significant portion of your inspection targets are at a great distance from where you’re able to stand and view them, then a telephoto lens is likely worth having.

Telephoto Lens

 

On the other side of the coin are instances when our target or area of interest is too close to our position during the inspection and we can’t view the full scene as desired.  This can happen in electrical rooms, mechanical areas, and in building inspections. These are excellent opportunities to employ a wide angle lens.  The wide angle lens does the opposite of a telephoto; it optically widens your field of view, effectively pushing your target “away” from you, or reducing the image.

Wide Angle Lens

In short, what makes optional lenses right for you is the applicability to your type of inspection.  If you can easily move closer or farther away, the need for an extra lens is not great. But if you need to magnify or reduce the size of the target you are viewing, optional lenses will help you get the best thermogram possible.

 

Think Thermally, 
www.thesnellgroup.com
The Snell Group, a Fluke Thermal Imaging Blog content partner
 

The “Auto” Range Feature: Best Friend or Worst Enemy?

One of the most widely used features added to cameras in recent years is the “auto” button or “auto range” setting.  In “auto mode,” or with the touch of the “auto button,” your imager will automatically adjust the level and span setting to account for the warmest and coolest items in the field of view at that time.  Some cameras have a button that is a one-time adjustment, and others have a setting that continuously re-adjusts as the camera pans around and items in the field of view change.

It is a very useful feature for sure, particularly when your inspection location changes from one ambient extreme to another.  Remember, the auto feature adjusts the level and span settings to account for the warmest and coolest objects (and everything in between) in the field of view of the camera at that time.  If there are extreme temperature variances in the field of view when auto is selected, and at the same time somewhere between those extremes is a thermal anomaly, the auto feature may very well mask it.  See Figures One and Two below.

 

Figure Two

Figure One

Figure One

 

 

 

 

 

 

 

These two images are actually the same.  In Figure One, the “auto” range was selected.  As you can see, the contrast in Figure One is much wider due to the temperature of the thermal foreground of the field of view, which is the very cold morning sky.  The warmest surface in each image is clearly the two noted anomalies. Had the thermographer relied solely on the auto feature when taking the above image, the switch anomalies may very well have been missed.

The auto range function must be used with care.  In the back of your mind,  need to have the thought that the image you see may not be at the optimum level and span settings to detect every possible problem.  Manual optimization is still often quite necessary in order to detect lower grade anomalies.

Awareness of the limitations of this feature is the key to success in its use.  Use it with care, and it can be your best friend.  Use it frivolously and it could turn into your worst enemy.

Think Thermally, 
www.thesnellgroup.com
The Snell Group, a Fluke Thermal Imaging Blog content partner
 

Roof Moisture Inspections

Roof moisture inspections are one of those applications of infrared thermography that many in the industry have heard of, but not so many have attempted.  It’s kind of a niche application, really.  In my decade or so of experience in this industry, I’ve only had the opportunity to be involved in a handful of these types of inspections.  Each one was unique, and each presented its own set of challenges.

The ASTM C1153, Standard Practice for Location of Wet Insulation in Roofing Systems Using Infrared Imaging is the guiding document for these types of inspections.  It lists the conditions that have to be met in order for an attempt at a roof moisture inspection to be successful.  Roof moisture inspections are really as much an art as they are a science.  The standards suggest beginning your inspection an hour or two after sunset, after a sunny day.  How long precisely it takes for a pattern to emerge is dependent upon many factors.  Roof construction, weather conditions, camera resolution, lots of things.  There’s no hard, fast rule.  If there’s ballast on the roof, that impacts both what you see as well as how soon you see it.  Also, the patterns often can be obscure, so it takes an experienced eye to pick out some of the lower magnitude anomalies.

What does the newly minted thermographer do then?  It’s a good idea to spend some time perfecting the inspection process.  If you can, try to tag along with a more experienced thermographer on your first few roof inspections.  That’s a good idea with any of the applications really.  Try to keep in mind that  mastering an art takes time and give yourself plenty of opportunity to practice.

 

Think Thermally, 
www.thesnellgroup.com
The Snell Group, a Fluke Thermal Imaging Blog content partner

 

Color Palette Choices

Recently, I had a Level I student ask me a question I’d never heard before.   He asked why there were so many palette choices on his infrared camera.  Often I’m asked which palette works best, or which my personal preference is.  I’d never had anyone ask me why there are so many  choices.  He went on to say that he had trouble picking which one to use.  That’s actually kind of a nice problem to have!

By and large, which palette you apply to your images, either while inspecting or when generating a report, is a matter of personal choice.  Your inspection program might dictate such things, but often they don’t, so the thermographer is given free rein to pick as they like.  As sweet a deal as this is, there are some points to consider when exercising this freedom.

  • Most importantly, what might your customer want?  The “WOW” factor of a multicolor palette goes a long way with some folks, while others like to keep it simple.
  •  Another point, how intuitive are the colors you choose?  Your report loses impact when the end user has to try and decipher which color or shade corresponds with which range of apparent temperatures.
  • Are you delivering the data accurately? Beyond impressing your customer with brilliant images, your chief goal is to deliver useful data.  Sometimes the color palette matters in that regard.
Image 3

Infrared Camera Color Palette Choices

Image 4

Infrared Camera Color Palette Choices

 

 

 

 

 

 

 

 

Infrared Camera Color Palette Choices

Infrared Camera Color Palette Choices

Infrared Camera Color Palette Choices

Infrared Camera Color Palette Choices

 

 

 

 

 

 

 

 

Whichever you choose, make sure you explain to your customer which colors denote which ranges of temperature to reduce confusion.  Freedom of choice is a wonderful thing in the thermal world, just makes sure you use it wisely.

Thinking Thermally,
The Snell Group, a Fluke Thermal Imaging Blog content partner

Thermal Imaging joins the CNX™ Wireless System

Did you know that Fluke infrared cameras can now wirelessly connect to 5 other Fluke test and measurement tools and take multiple measurements simultaneously?

The Fluke Thermal Imaging CNX™ Wireless System includes the following infrared cameras: Ti100, Ti105, Ti110, Ti125, TiR105, TiR110 and TiR125.

Allow us to send you a free Fluke Thermal Imaging CNX™ Wireless System poster and you’ll see how easy it is to:

• Connect multiple instruments wirelessly
• Measure incoming current
• Troubleshoot systems
• Determine current unbalance
• Measure current load

Get your poster here