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The ranges of average surface roughness value, Ra was 2.93–3.01 µm with a mean value of 2.98 µm and this is far lower than when no particle was used as ...

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For convenient connection to the drivers listed below and on the LED Drivers tab, the LED ring light has a connection cable with an M8 connector; see the Pin Diagram tab for the M8 connector pin information. This LED ring light also features an EEPROM chip which stores information about the LED (e.g., current limit, forward voltage). When controlled by a Thorlabs UPLED, DC40, or DC2200 LED driver, this data can be used to implement smart safety features.

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The diagram to the right shows the male connector of the LEDRW40 Ring Light. It is a standard M8 x 1 sensor circular connector. Pins 1 and 2 are the connection to the LED. Pin 3 and 4 are used for the internal EEPROM. If using an LED driver that was not purchased from Thorlabs, be careful that the appropriate connections are made to Pin 1 and Pin 2 and that you do not attempt to drive the LED through the EEPROM pins.

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Nov 18, 2020 — Arm: Supports the microscope head and attaches it to the base. Nosepiece: Holds the objective lenses & attaches them to the microscope head.

Internally RMS Threaded; Four-Position SM1-Compatible Objective Lens Turret; Post Mountable and Cage Compatible Mounts for Single Objectives.

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White Light LEDsThis illuminator is a daylight white LED ring featuring a broad spectrum that spans several hundred nanometers; see the table to the right for a typical output spectrum. It has a correlated color temperature 5500 K, which indicates that the color appearance is similar to a black body radiator at the same temperature. In general, warm white LEDs offer a spectrum similar to a tungsten source, while cold white LEDs have a stronger blue component to the spectrum; daylight white LEDs provide a more even illumination spectrum over the visible range than warm white or cold white LEDs. To discuss LED ring lights with other correlated color temperatures or nominal wavelengths, please contact Tech Support.

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Constructed from anodized aluminum, this LED ring light housing features four 4-40 tapped holes that are compatible with our Ø6 mm ER cage rods, allowing for integration with 30 mm cage systems. The housing also features three setscrews on the sides for interfacing with various camera lenses and high-magnification zoom lens systems (as seen in the photo in the bottom right), which can be secured using a 5/64" (2.0 mm) hex key or balldriver. An M60 x 1.0 external thread at the head of the ring light gives the option of attaching various elements such as custom filters or diffusers.

Thorlabs' LED Ring Light Source consists of 40 individual broadband, daylight white LEDs in a ring-shaped array with a Ø0.99" (Ø25.1 mm) clear aperture. By angling the LEDs, this ring light illuminates areas from 50 mm to 300 mm along the emission axis that can then be viewed through the clear aperture, making it ideal for machine vision applications.

Driver OptionsThorlabs offers four drivers compatible with this LED ring light: LEDD1B, DC40, UPLED, and DC2200. See the LED Drivers tab for compatibility information and a list of specifications. The UPLED, DC40, and DC2200 drivers are capable of reading the current limit from the EEPROM chip of the connected LED ring light and automatically adjusting the maximum current setting to protect the LEDs. The DC40 LED driver can provide drive currents with up to a 5 kHz modulation when supplied with an external modulation signal. While the DC2200 driver is capable of modulating frequencies up to 250 kHz, the LED ring light must not be modulated at or above 9 kHz.

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Some example lasersThe diagram below shows how power and color affect hazard distances. For comparison purposes, all lasers have a 1 milliradian divergence, although in the real world, the divergence generally increases as the power increases. Here are a few interesting things to notice:Comparing the top two bars, we see how color affects a visual interference distance. The 1 mW red pointer has a glare distance of 255 feet, compared to the same power green laser, which can cause glare at 490 feet.Similarly, the bottom two bars show that the green laser has much longer visual interference distances than the blue laser -- even though they both are the same power and thus have the same NOHD distance.Comparing the 5 mW green pointer to the 500 mW green pointer, we see how power affects hazard distances. The 500 mW laser is 100 times more powerful, but the glare distance is only 10 times greater. Although the numbers are not shown on this chart, the same effect happens to the NOHD. The 500 mW laser’s NOHD is only 10 times the NOHD of the 5 mW laser, despite being 100 times more powerful.Click diagram for larger view

Color indicates the relative hazard: Red = potential injury, green = unlikely injury. Beyond the Nominal Ocular Hazard Distance, the chance of injury is “vanishingly small” according to safety experts.

The diagrams above depict the NOHD being reduced by half, but this reduction also applies to skin and fire hazard distances, and to the visual interference distances (flashblindness, glare and distraction). Doubling a laser’s divergence will reduce all of these hazard distances by half.Usually, the more powerful a laser, the larger the typical divergence of the laser. Divergence can be improved (made tighter) using a lens or better engineering of the laser itself.How laser power affects hazard distancesIf a laser’s power is increased, the hazard distances are longer by the square root of the power increase. Going from a 5 mW to a 500 mW laser is a 100 times power increase -- but the hazard distances only become 10 times as long. (The square root of 100 is 10.)

This tab includes all LEDs sold by Thorlabs. Click on More [+] to view all available wavelengths for each type of LED pictured below.

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Thorlabs also offers a range of unmounted, mounted, collimated, and fiber-coupled LEDs that are designed for a variety of applications, including microscopy, illumination, and measurements. For questions on choosing an appropriate LED and to discuss mounting requirements, please contact Tech Support.

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To fully support the max optical power of the LED you intend to drive, ensure that the max voltage and max current of the driver are equal to or greater than those of the LED.

However, note that in general, the higher the laser power, the higher the divergence. Because the beam is spreading out faster, the power density (irradiance) drops. This helps make the beam safer and thus the NOHD shorter, compared to a situation where the divergence doesn’t increase as laser power increases.Both of these effects are a bit of good news for pilots and others concerned about increasing laser powers. As consumers obtain more powerful lasers, the hazard distances (NOHD, visual interference) increase less than one might expect. A laser 100 times as powerful is not 100 times as dangerous; it is “only” 10 times as dangerous, assuming the divergence is the same. And since divergence usually increases with power, the beam may be even less hazardous due to the increased spreading.How wavelength affects hazard distancesFor visible lasers, the wavelength (color) does not affect the eye hazard (NOHD), skin hazard or fire hazard distances. But wavelength does affect the three visual interference distances: Flashblindness, glare and distraction.The human eye is most sensitive to green light of 555 nanometers. This color would appear brightest, and most distracting to pilots, compared to other colors from an otherwise equivalent laser (e.g., having the same power and divergence).Most consumer lasers emit green light at 532 nanometers. This appears to the eye only 88% as bright as 555 nm light. Because it is so common, we will use 532 green as the baseline for “brightest available laser” in the following calculations:Compared with 532 nm light, the common red wavelength 635 nm appears only 27% as bright. This has a square root effect on the visual interference distances. A 532 green laser appears 4 times as bright as a 635 red laser -- but the green visual interference distances are only 2 times the red distances. (The square root of 4 is 2.)Compared with 532 nm light, the common blue wavelength 445 nm appears only 3.5% as bright. Again, there is a square root effect on the distances. A 532 green laser appears 29 times as bright as a 445 blue laser -- but the green visual interference distances are only 5.4 times longer than the blue distances. (The square root of 29 is 5.4.)The diagrams below show how the beam color affects a visual interference distance. Note that since all three lasers have the same power and divergence, the NOHD for these would be equal -- it is only the visual interference distances that will change based on the wavelength.

Jan 23, 2014 — 2 Answers 2 ... Diffraction effects depend on the wavelength of the light. ... The reason that diffraction effects are able to split white light ...