What are Beam Splitters? - beam splitters

 2024-08-28 02:17:50

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Modulation transfer function

Multi-Zone Ring Lights are designed for compact 3D photometric stereo applications. Compact and powerful, the low-angle mini ring lights work best for dark-field ring applications and radial illumination lighting configurations. Multi-Zone Ring Lights are sold in kits with the 4ZMD Four Channel LED Driver, which permits control of up to four separate lights or light zones, either independently or simultaneously, in any combination and at any intensity level. The 4ZMD strobes the lights independently for photometric and multi-light applications. When connected to SVL’s new programmable LED Light Manager (LLM), each channel of the Multi-Zone Ring lights can be set to continuous on, off, or any intensity level in between, as well as OverDrive™ strobe mode.

MTFlens

PLEASE NOTE: MTF Charts are fairly complex so if you’ve some this far to read what it is, I’d urge you to continue to my in-depth article that explains how to read an MTF chart. This glossary entry here is intended only to give you a brief overview.

AL Area Light DADL75 Dual-Axis RGB LED Light DDL-100 Dome Light DDL-150 Dome Light DDL-250 Dome Light DFL-300-600 Dark Field Light DFL-460 Dark Field Curved Light DFLB-460 Dark Field Curved Backlight DLP Diffused Ring Light Panel DLPW Diffused Ring Light Panel Washdown L300 Linear Connect-a-Light LB300 Linear Backlight Connect-a-Light LC300 Linear Light LCHP Line Scan LE Linear Lights LHF300 Fluorescent Replacement LHP Line Scan LLPX LED Light Panel Backlight LLPX-H LED Light Panel LM45 Mini Linear Light LM75 Mini Linear Light LW300 Linear Connect-a-Light Washdown LX150 Direct Connect Bar-Linear Light LX300 Direct Connect Bar-Linear Light LXB150 Direct Connect Bar-Linear Backlight LXB300 Direct Connect Bar-Linear Backight MOBL Maximum Output Backlight ODL300 OverDrive Linear Connect-a-Light ODLB300 OverDrive Linear Backlight Connect-a-Light ODLHF300 OverDrive Fluorescent Replacement ODLW300 OverDrive Linear Connect-a-Light Washdown ODMOBL OverDrive Strobe Maximum Output Backlight ODR130 OverDrive EZ Mount Ring Light ODR130-16 OverDrive EZ Mount Ring Light ODR80 OverDrive EZ Mount Ring Light ODRD130 OverDrive Diffused EZ Mount Ring Light ODRD80 OverDrive Diffused EZ Mount Ring Light ODRL200 Large Ring Light ODRL300 Large Ring Light ODS75 OverDrive Brick Light ODSW75 OverDrive Brick Light Washdown ODSX30 OverDrive Prox Light ODSXA30 OverDrive Adjustable Prox Light ODSXF30 OverDrive Fiber Prox Light ODSXP30 OverDrive Projector Lights ODSXW30 OverDrive Prox Light Washdown R130 EZ Mount Ring Light R80 EZ Mount Ring Light RC130 EZ Mount Ring Light RCC130 EZ Mount Ring Light RD130 Diffused EZ Mount Ring Light RD80 Diffused EZ Mount Ring Light RL200 Large Ring Light RL300 Large Ring Light RM75 Mini Ring Light S75 Brick Light SB75 Brick Light SC75 Brick Light SOBL Standard Output Backlight SOBLW Standard Output Backlight Washdown SW75 Brick Light Washdown SX30 Prox Light SX30-RMH Fiber Prox Light SXA30 Adjustable Prox Light SXA30 datasheet SXF30 Fiber Prox Light SXP30 Projector Lights SXW30 Prox Light Washdown XR256 High Speed

MTF stands for Modulation Transfer Function and an MTF chart is a chart that plots the optical performance of a lens across the the image, from the centre to the corner.

The x-axis of an MTF chart is measured in millimetres and it represents the distance from the centre of the lens. 0 is the centre and for full frame 35mm sensors, the far side is 21.6mm.

LensMTFdatabase

Mtf graphexplained

Lighting applications today require light sources to reach full intensity in a shorter time to keep up with faster image acquisition by high-speed cameras. To meet this demand, Smart Vision Lights has developed a driver capable of delivering full power to a light in 500 nanoseconds or less. The NanoDrive™ is designed to allow tens of amps to reach the LEDs of the light within nanoseconds, resulting in a light reaching its full LED power/ light intensity within that time frame. This patent-pending technology is featured in most new Multi-Drive and Overdrive products developed by Smart Vision Lights starting in 2019. Multi-Drive™ lights use a constant current driver that allows for continuous operation or OverDrive™ strobe mode. High-speed inspection requires fast image acquisition or a short image exposure. Image acquisition requires lighting to be strobed at a rapid rate, providing enough light to “freeze” an image properly with little to no pixel blur. Lights built using NanoDrive™ technology are able to rapidly reach full intensity in nanoseconds when strobing, allowing for a very short image acquisition time and helping to minimize or remove ambient lighting.

MTFformula

Smart Vision Lights has been a leading designer and manufacturer of high-brightness LED lights for industrial applications since 2007 and has been growing and innovating since day one.

mtf: image quality

The LED Ligth Manager (LLM) can drive multiple lights of virtually any type or up to four individual zones or channels within an integrated photometric or multispectral ring light solution. Each program can contain up to six sequences with up to four lights set to continuous on, off, any intensity level in between, and even OverDrive™ strobe mode. To program the four zones of a single LED illumination system such as a ring light or four separate LED light sources, simply connect the LLM to a computer via Ethernet cable and use the browser-based interface to program the light through a series of drop-down menus. The intuitive user interface makes it possible for technicians of any level to set image sequences and program intensities for each light. The LLM system and light kit bundles initially will target 3D photometric stereo and 2D multi-light applications. When used in conjunction with specialized photometric stereo software from Sensopart, the lighting system can solve previously intractable tasks, such as finding a defect in the surface of a part. By capturing successive images of a stationary object as it is illuminated by a sequence of lights, photometric image processing software can determine the 3D surface orientation of every pixel across the object’s surface. The same technique can generate 2D images of multiple regions of interest using separate lights and/or cameras. LLM is also appropriate for multispectral imaging solutions where the LED wavelengths — and not broad-spectrum white lights with optical filters in front of the sensor — are the spectral band selection mechanisms. Using the color of illuminating light as the spectral band selection mechanism can greatly reduce the cost of multispectral imaging solutions, while increasing budgets for imaging applications.

The y-axis shows a lens’ performance in recreating a set of test charts that show repeating line patterns, called line pairs. Although the scale is in decimals, it’s actually referring to a percentage score of how well the lens was able to reproduce the image of these line pairs. At a minimum, two sets of line pairs are tested, one which is set to 10 lines/mm and one which is set to 30 lines/mm. The former test for contrast performance, while the latter tests resolution. Both results are plotted on the chart as different lines and some charts, like Canon’s, also show these results for the lens when it is wide open and also when it is at f/8 (the ‘sweet spot’). On top of this, the line pairs are tested in two orientations called sagittal and meridional, because a lens’ ability to reproduce fine detail and contrast does actually vary depending on the orientation relative to a diagonal line from the centre of the image to the corner.

Various lines on the chart depict the lens’ performance in both contrast and resolution, and it’s the combination of these two things that give us what we might call perceived sharpness. A lens only looks sharp when there is a good balance of both contrast AND resolution, even though most people don’t typically think so much about the contrast side of things.

The Multi-Drive™ controller combines two drives into one with Constant ON operation and OverDrive high-pulse operation. The Multi-Drive™ controller allows the user to run the product in Constant ON operation or pulse/strobe the light at the maximum allowed intensity by simply setting the product parameters. OverDrive operation is five times or more the power vs. constant operation. The built-in Multi-Driver™ also protects the LEDs from premature degradation and failure caused by excessive heat by regulating the current delivered to the LEDs and limiting the duty cycle of the light. Multi-Drive™ offers the best of both worlds. Constant operation can be used with the option of HIGH output strobe/pulse operation. Other advantages of Multi-Drive™ include faster imaging and capture/freeze motion on high-speed lines.

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