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Rulers![]()
MFT1 Magnetic Measuring Tape BHMA1 Mounting Bracket for Beam Height Rulers BHM3 6" (155 mm) Magnetic Beam Height Measuring Tool ![]() Please Wait Thorlabs offers two solutions for hands-free measuring on an optical table or breadboard. First, our MFT1 Magnetic Measuring Tape lays flat on any magnetic surface to provide a reference for the position of components. Second, our BHM3 and BHM4 Magnetic Beam Height Rulers feature holes at 25 mm and 1" intervals to allow a laser beam to pass through. The rulers are laser engraved with both imperial and metric scales and are held onto any magnetic surface by two magnets in their bases. A Mounting Bracket is also available that allows two beam height rulers (Item # BHM3 and BHM4) to be attached at a 90° angle. This allows for alignment of a laser beam horizontally in addition to measuring its height off the table.
![]() ![]() Click to Enlarge MFT1 Measuring Tape Covering One Row of Holes on an Optical Table
This vinyl magnetic measuring tape provides a convenient solution for determining approximate distances hands free on an optical table or breadboard. With a magnetic back that extends over the full length and width of the ruler, this measuring tape lays flat on any magnetic surface and features both imperial and metric scales, with numeric marks every 1" and 1 cm and tick marks every 1/8" and 1 mm. Only 0.03" (0.8 mm) thick, the ruler maintains a low-profile on the table. If a shorter length is desired, the ruler can be cut into segments. Please note that vinyl can stretch; consequently, this measuring tape should be used as an alignment aid and not as a precision measurement tool. ![]() ![]() Click to Enlarge Each ruler has holes next to the major ticks of the metric and imperial scales to allow a laser beam to pass through. ![]() Click to Enlarge Light from a HeNe Laser Passing Through a Hole in a BHM3 Ruler
Our BHM3 and BHM4 Magnetic Rulers measure beam heights up to 6" (155 mm) or 12" (305 mm), respectively. The front of the screen is laser engraved with 1.0 mm and 1/16" graduations for beam height measurement. A series of twelve or twenty four Ø2.0 mm (Ø0.08") holes (on the BHM3 and BHM4 respectively) are positioned next to the engraved numbers at 25.0 mm and 1.00" intervals to allow a laser beam to pass through the ruler. The base of each ruler is fitted with either one or two neodymium magnets that hold the ruler to magnetic work surfaces and provide flexibility of movement when compared to an option that is bolted to the table. The BHM3 has one of these magnets, while the BHM4 has a pair. Both rulers are constructed from bead-blasted aluminum to remove any sharp edges and then anodized to create a homogeneously diffusive surface. The compact size allows the tool to fit into small gaps between components, enabling easy integration into a setup. We also offer the BHMA1 bracket below for attaching two beam height rulers, allowing for the alignment of a laser beam horizontally in addition to measuring its height off the table. Please note: Due to the presence of magnets, this ruler should not be used in the vicinity of pacemakers, credit cards, or other devices affected by magnetic fields.
![]() ![]() Click to Enlarge BHM3 Ruler Mounted at 90° on a BHM4 Ruler Using the BHMA1 Bracket ![]() Click to Enlarge VRC4 IR Detector Card on a BHM3 Ruler
Thorlabs' BHMA1 Mounting Bracket allows two beam height rulers to be attached at a 90° angle. This capability allows for alignment of a laser beam horizontally in addition to measuring its height off the table. As shown in the image to the right, the bracket can also be used to attach Laser Viewing Cards to a ruler, allowing for the viewing of UV, NIR, or MIR beams. ![]() Click for Details BHMA1 Mechanical Drawing Constructed from durable black Delrin, this bracket contains a built-in spirit level (bubble level) for consistent leveling of the mounted part. When the bubble is centered between the two graduations the bracket is level. When the center of the bubble is under one of the graduations then the bracket is rotated by 31 arcminutes. Laser engraved 1.0 mm spaced graduations are also included on three sides of the bracket. These markings can be used to indicate how far the mounted part has been translated horizontally or to repeatably add a ruler or viewing card into the setup. A through slot in the top of the bracket, shown in the drawing to the left, is shaped to fit over the top of the BHM3 and BHM4 rulers. Once fitted the bracket is free to translate vertically across the ruler. From here a second ruler or a viewing card is placed in the space between the first ruler and the front of the bracket. Everything is held in place by applying pressure using the thumbscrew on the front of the bracket. Please Note: These brackets are created from Delrin and are not rated for laser safety. *Delrin® is a registered trademark of DuPont Polymers, Inc. | |||||||||||||||||||||||||
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