EHEV3-USBUV
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1. E a i E Lo ana qji 7 cre ff E F amp F E x I fe Fig 4b Microscope in its stand using 0 5 mm scale fand 0 221 Spacer 12 mm Maximun If Fig 4c Microscope in stand on spacers See Fig 5 spacers 0 221 maximum hight Fig 5 Microscope stand on plastic Fig 6 illustrates the two choices of LED lighting white wt and 375 nm ultraviolet uv Note the LED bright light spot reflection in the left center of Fig 6a This imbalance may seem as a flaw in the design While it obviously is a flaw it may also be used to advantage if the subject is rotated 90 degrees counter clock wise to have the bright spot at the top of the photo which is what we as humans are used to This is often referred to as Rembrandt lighting I have used it as emphasis lighting for certain subjects SS wes woe eg Twi E DNT UEFA TANE l i h Uy eT Ea nue 4 2E iS i POIS PEAR JAA J i This time is 3 0 pomt text i hi i line is 339 XH Ths i jS py mtt Ghis line is 4 This line is 4 0 poit This line is 4 5 p Fig 6a Photo of a photo paper printed test text white Fig 6b Photo of a photo paper printed test text uv Page 3 of 11 pws f a euE Br ERa Also note that the left corners are dark Note that the uv version of the same photo Fig 6b is more uniformly lit but with a brighter spot in the center The subject is violet inkjet text on photo paper to emphasize this lighting and as you w2. does not have the uv feature It also offers variable level lighting The modifications suggested here would also apply to it The convenience and small space required for small subject photography requiring a magnification range of 10x to 30x in a 1600 x 1200 pixel image makes this USB microscope an useful tool for a technical writer Google the Images for glass diode to see how Fig 16 compares to what is on the Internet In that perspective Fig 16 is very impressive indeed Richard J Nelson February 13 2011 Comments welcome at rjnelsoncf cox net Page 11 of 11
3. focusing range of the microscope and its viewable specimen size See Fig 4 Using the microscope in the stand is really convenient and it doesn t involve buying modifying or Page 2 of 11 building an additional stand to hold the microscope in the conventional manner The range of subject sizes is limited and the range of magnification is limited but every microscope has limitations One of the applications I have is magnified images macrophotography of small electronics parts Another application is calculator displays and printer outputs The third application I have is fluorescent crystals minerals The focusing of the microscope extended the added distance of 0 27 inches of the stand How far will it focus See Fig 5 The spacers shown in Fig 5 are from a Home Depot window blind cutting station and are 0 22 high This represents the focus limit for my particular microscope Examining flat subjects such as coins paper money screens cloth and printer outputs is especially convenient because the microscope only takes five square inches of an always crowded desk top space It is very convenient to just pick up the microscope and set it on the subject and take a photo See Fig 6 See as TL i it Wig a KAN Ig j i 1 Si i rhe y j aak ki Ter ae ra aed Cae p lt P oT Ta Ls y r r a fist UP S ue 1 he ae ri 4 g et f 2 E Ea p J oe 4 ae ied i N ae amp A 3 B eh t y ERT ia d wi ie iene Eo i
4. microscope to sit on the specimen and still be stable in the holder This would be the same magnification I will call it HI Mag 1 4 20 Thumb Screw as intended for skin use a The smaller 3 8 disc allows the specimen to be raised into the nose of the microscope for maximum 3 4 inch Flat Working 3 8 inch magnification I found this to be Stage Area Stage about 8 turns or 0 40 I call this A aaia o a Extra Hi mag See Fig 7 Fig 7 Modified plastic holder and wood base with two adjustable stages The 3 8 stages are B White Photo paper D White card stock A Black paper C Bare screw head E 0 05 orange grid Another possible stand improvement is to drill and tap a hole in the side of the holder Properly located 3 16 from the top it would eliminate the need for a spacer as shown in Fig 5 I used a 1 4 20 screw because I had one in my junk box You will need a No 7 drill for this thread Using the base I more accurately determined the minimum maximum magnification range I used the specimen measurements shown in Fig 8 to accurately measure the range The physical specimen size is Page 4 of 11 103 mils 2 6 mm See Fig 8a i iP gb Fig Sa Test specimen dimension Fig 8b Low specimen magnification Fig 8c Ex Hi specimen magnification Viewing Fig 8b and 8c at 2x using Paint Shop Pro on my 37 5 cm wide LCD monitor I measured the and n
5. Examining the Able Eye USB Uv Microscope EHEV3 USBUV Richard Nelsou Introduction As a regular attendee of the annual early January Consumer Electronics Show in Las Vegas I have learned to always ask 1f a particular exhibitor has a show special If I am interested in a product especially a new one I will often take advantage of the show special and I have done this for over 40 consecutive Shows The shows used to be held twice a year One of the show specials of CES 2011 1s shown in Fig 1 Below is a reproduction of the technical specifications from the User s Manual on the small CD included with the product TECHNICAL SPECIFICATIONS EHEV3 USBUV DSP Digital Image Monarch Processor Sensor high quality CMOS sensor 2M pixels Resolution 1600x1200 Colors true color 24bit RGB Interface USB2 0 Frame rate 30 frames sec CIF and VGA UV excitation wavelength 375nm Magnification 50x Size 32mm in diameter 92mm in length 10 USB cable length 1 8 meters 11 Image freeze just rap space bar 12 Timing snap 10 seconds 13 Weight 127 grams O ON ODOR ON gt I added 13 Note item 8 which specifies the magnification as 50x This will be examined later Also see related article on this website titled Microscope Magnification Fig 1 LED white and uv light skin USB Microscope Description of Uv Microscope I bought this as my 4 or 5 USB microscope in the last fiv
6. am told are due to excessive exposure to sunlight I don t see these on areas of skin not normally exposed to sunlight The nose shows more spots than other areas of the face Is this because it is more normal to sunlight I wonder what is the age of a person when these show up Fig 19 Human eye lid with dead cells on eyelash Fig 20a Facial nose skin in white light Fig 20b Facial nose skin in uv light Supplied Software Page 10 of 11 As Fig 1 shows a small sized CD is included This CD has the manuals for 14 models and the instructions for copying the two files you need to use the USB microscope Note that I said copying NOT installing I just copied the ehe exe and msvcr100 dll files to the desktop and everything works as intended I have used the software on my laptop using Vista and my desktop using Windows 7 I have also used the same software on other competitors USB microscopes I will not review the software here Itis adequate and simple Observations and Conclusions The Able Eye EHEV3 USBUV USB Uv Microscope was designed for personal skin care use to better see sores ingrown hairs blemishes and skin especially sun damage using white and 375 nm ultraviolet light It is designed to be used hand held with two control buttons to change the lighting and take a photo at a fixed magnification A white plastic stand internally shaped to match the tapered nose is modified to convert it into a more conven
7. as shown in fig 8a as follows Fig 8b 100 42 mm Fig 8c 224 46 mm 66599 1 outside edges of Under these conditions the ratio 1s 224 46 100 42 2 2 The respective magnifications of the images as seen on my screen are Fig 8b 38 6x and Fig 8c 86x Itis more reasonable accurate to use the 1x numbers or half of these for the true magnification Fig 8b 19 3x and Fig 8c 43x Of course this is only based on the screen size See article titled Microscope Magnification The revised focus range numbers are 0 40 for the 3 8 stage 0 27 for the base thickness and 0 22 for the highest useable spacers see Fig 5 0 89 or 22 6 mm That is about 7 8 s of an inch Keep in mind that these numbers are for a product sampling of one and that other products will vary slightly From a practical perspective you want the adjustment ring to be able to go slightly past the focus and you back up to confirm the best focus Magnification Basically the uv microscope as used in the stand and on a wood base Fig 7 has four magnifications EH The highest magnification is the closest position to the camera This would be on the 3 8 stage and this is a limit to the physical size that may be viewed The specimen may not extend outside the 3 8 circle This is suitable for small electrical parts ants small bugs amp beetles and specimens that may be cut to fit on the 3 8 diameter stage I call this e
8. ave had in my e Junk box for over 30 years a a oy I have only included a few photos of the dozens of components that I have examined with this USB Fig 16b Highest magnification showing die and contact microscope Fig 17a Precision micro sized snap action switch Fig 17b Close up of contacts of switch in Fig 18a The examples of the images shown here have covered just a few subjects Even with the lighting provided by the microscope it is possible to take some very effective photographs Ease and convenience is what makes this USB microscope so attractive but what about the intended body use of the uv microscope Fig 18 shows hair Is someone going gray Is that lint I see in Fig 18b WOW Fig 18b is under uv Page 9 of 11 light This is chest hair and the lint is probably from the cotton T shirt Soap increases the fluorescence b gt ga Fig 18a Human hair as seen by the USB uv microscope Fig 18b Same as Fig 18a using uv light I started looking around my body for a few examples of F images to illustrate how the uv microscope was intended to be used Figs 19 and 20 will provide a hint of what you may see with the intended use of this microscope You may also photograph areas that you normally don t see such as your teeth in your ears or your scalp Fig 20 is a good example of sun skin damage The uv light shows red spots not visible in white light that I
9. e blue uv LEDs The third press turns all LEDs off The video camera is always on The bottom button is a shutter switch that takes the photo The white plastic stand that comes in the very fancy box is intended to hold the microscope when not in use Its internal shape matches the tapered nose I have very little interest in the skin application and I had more conventional technical applications in mind for this model when I bought it One of the objectives I have in writing this article is to stimulate ideas for applying low cost USB microscopes so the first applications problem Fig 2 LEDs inside the camera with cover removed was to think of a way to use the uv hand held USB microscope in a more conventional way not handheld After a bit of thinking I had an idea Why not drill a 3 4 hole in the bottom of the stand and place the microscope stand on top of the subject being examined The microscope will be raised by 0 27 This turned out to be very practical and convenient See Fig 3 I chose the hole size to be as large as possible and still insure that there would be adequate tapered nose contact with the bottom of the stand to provide holding friction when turning the microscope against the forces of the significantly stiff cable The focusing range of the microscope easily covered the increased 0 27 distance The first tests I made were to determine the Fig 3 3 4 hole drilled in the stand
10. e years and I wanted to see how they have recently improved There are many different styles and designs in the market place ranging from less than 50 to hundreds of dollars What piqued my interest in this model they had many on display at CES was its alternate light source of white wt and ultraviolet uv light It was the last day of the four day show and it was the only one they had left See Fig 2 on the next page The nose cover was removed to take the photo Note that there are six blue LED s and only three white The white ones are further from the subject a person s arm or face Page 1 of 11 and they appear to be much brighter so this makes sense Lighting is always a critical issue with any microscope This model is being marketed as a medical device for personal health You are supposed to press the nose of the microscope against the skin to see various skin conditions such as sores ingrown hairs blemishes and skin damage especially from the sun The microscope has a knurled ring as shown in Fig 1 just above the white stand which is used to focus the image The intended use is to be hand held Hand holding a microscope is normally difficult but in this particular application it works well because it 1s pressed against the skin which allows you to hold it steady There are two buttons The top button controls the lighting The first press turns on the white LEDs The second press turns off the white and turns on th
11. ewer knows uv is used to better see biological specimens and gt materials that fluoresce I will show both white and Fig 9 Table salt viewed at maximum magnification uv versions for most of the photos that follow Another easy class of items to look at and photograph is flat items such as coins and currency Fig 10 shows a US dime The interesting point of the uv image in this example is to show the lint that wasn t noticed when viewed using white light I have not taken the time to blow off the subjects for these images Fig 10a US dime magnified to see the two letters JS Fig 10b Same as 10a except using uv light Note lint The man demonstrating the microscopes at CES used Chinese currency to show how fluorescent inks are used to reduce counterfeiting Because the color was so bright I needed one for myself so a 5 Yuan note became part of the deal Another USB microscope was used to take an over view photo for context Fig 11 shows the area of the note of interest This USB microscope is also examined in another article found on this website The dramatic difference of what is seen in uv light compared to white light may be seen in Fig 13 Note that the big digit 5 in black in the upper half of the photo is not even visible in white light Also note that Page 6 of 11 a large area is highlighted in yellow also not seen in _ EC Ze i e Ra a white light Fig 13 was taken with the l
12. ill see in other sample photos you would hardly notice these effects We only see this because we are varying the specimen distance which is assumed fixed for this skin design Magnification Range of 2 2 1 Before I show you various image examples I will suggest an idea to further extend the magnification focus range of this microscope Fig 4 suggests a magnification range of 12 mm 7 5 mm or 1 6 to one How far into the microscope may a specimen be and still be in focus Inserting the specimen increases the magnification To do this I made an adjustable stage by buying a small bag of 34 long flat head 10 32 machine screws Press the nut into the wood to secure it in a 9 32 hole drilled through the wood base Secure a disc to the head with super glue by soldering etc Make one disc slightly less than the 3 4 inch diameter hole in the base and the other slightly smaller than the 0 475 inch diameter hole in the nose a 3 8 diameter works very well In fact the machine screw head is just slightly less than 3 8 and you may simply glue or use double sided tape a piece of a business card to the top and just cut around the head You could make three or four of these one with black paper and another with white paper Use a coated material I also made one with a fine grid and one with glossy photo paper The height of the machine screw stage may be adjusted as needed The larger disc makes up for the 0 27 base thickness which allows the
13. ow magni A EP EA eyo Cey fication stand on the spacer You may also detect EI Se aC ne blue fluorescence on the note in Fig 13b Small blue specs are scattered around on both sides Mi i A S he L We iit Nt Fluorescence is exhibited by many minerals I wanted to see how a few small particles would ff photograph under uv light The result 1s shown in Fig 14 The details of how the surfaces are shaped o may be discerned better by comparing the two images Obviously a sample that had a mix of fluorescent materials would stand out very well Fig 11 Portion of 5 Yuan Chinese note showing a big 5 Another unknown mineral sample is shown in Fig 15 I found this in my back yard which is in the Desert Sonoran It florescence s a different color red orange The example uv images show green blue yellow and red orange Of course you may use a uv flashlight with your normal microscope but being able to instantly switch between white and uv 1s especially convenient for comparing identical images ce Fig 12a 5 Yuan note showing space above the five Fig 12b Same view as Fig 12a in uv light Fig 15 shows a 6 35 mm diameter toroid transformer Is the insulation damaged in the center from inserting a mounting bolt Fig 15a is with the 3 8 stage low Fig 15b is with the stage at its highest useable position and Fig 15c is the uv lighting view Note the lint Why doesn t the fuzz sh
14. own at the top of the toroid in Fig 16a not fluoresce like the other three pieces of lint Fig 17 shows a glass diode Whenever a metal lead must pass through glass usually quartz the metal has to be as close as possible to the thermal expansion of the glass in order to avoid cracking and leaking The red areas around the ends of the leads is a special material that 1s applied to the leads during manufacture to aid in equaling the thermal expansion characteristics of the metal glass joint See photos on page 9 Page 7 of 11 Fig 13b Uranium glass particles in uv light Fig 14a Mineral sample found to have fluorescence Fig 14b Mineral sample found to have fluorescence Fig 15a Toroid transformer with 3 8 stage fully down Fig 15b Toroid transformer with 3 8 stage fully up Page 8 of 11 The Fig 16b photo was taken from the opposite side of the diode This better shows the spring contact of this germanium point contact diode The magnification and depth of field of this USB Fig 15c Toroid with uv lighting Fig 16a Glass diode Note spring type contact gt eee Microscope works well for examining small elec Par MEET o N tronic components like this a beet I worked for a company Hi TEK that developed the world s smallest microswitch In addition to it only being 0 300 inches wide it had a very long life These were test samples that I h
15. tional microscope The range of magnification was measured as 2 2 The nearly one full turn focusing ring allows the uv microscope to focus from 0 40 10 2 mm into the nose hole and 0 20 inches 5 0 mm from it A simple wood base was made to take advantage of this focusing range as shown in Fig 7 The microscope image on the LCD screen serves as a background Two adjustable stages are used as shown in Fig 7 to get the maximum range of magnification Adding the thumb screw eliminates the need for spacers as described in the text and shown in Fig 5 Several categories of subjects are photographed as examples ranging from printed text table salt a US dime currency minerals a toroid transformer glass diode snap action switch hair eye lid skin syringe needle ink and SMT resistor Fig 21 Examples of highest magnifica Surface Mount Resistor 0 0993 inches 2 52 mm long tion of typical technical specimens for a technical writer The quality is accept able and the USB uv microscope makes taking these easy and convenient Fig 21a Syringe needle good for size Fig 21b Black ink on photo paper Fig 21c Common SMT resistor Empty magnification is a common claim for most low end USB microscope suppliers The technology is improving and the future is clear Have you really seen your specimens if you haven t photographed them A similar model the EHE USB500 is rated at ten times the magnification 500x and it
16. xtra high EH magnification HI The microscope may be used without the stand handheld for normal magnification There is no limit on the specimen size I call this high HI magnification MD The next magnification is on the 3 4 stage and this also places a limit to the specimen size that may be viewed The same limitations for extra high magnification in the stand also apply except that the physical size limit is twice that of extra high magnification I call this medium MD magnification LO The lowest magnification is that obtained with the subject furthest from the camera and still be in focus This is when the microscope is raised up on a spacer of 0 22 as shown in Fig 5 or held up with the added thumb screw I will call this low LO magnification As I mentioned above the range of the low to high magnification is about 2 2 1 Page 5 of 11 Now that we have a good idea of the working and modified mechanics of the USB uv skin microscope let s look at a few example photos Example Photos Oe ee OR ES At the left is a classic low power microscope 3 A specimen example Fig 9 shows common table Pepe salt have also included a size scale as indicated It is a 30 Ga Syringe needle The outside diameter is 12 0 mils or 0 305 mm You may measure your printed or viewed image and calculate the effective digital magnification 4 Most of the uv microscope images shown so far use white light As any CSI TV vi
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