The Assisted Fiber-optic & Electric Rotary Joint is electrically driven as it senses and follows the tethered animal’s rotations. It detects the torsion of the optical cable during the animal movements and releases it with a very high sensitivity.
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The Assisted Fiber-optic & Electric Rotary Joint is electrically driven as it senses and follows the tethered animal’s rotations. It detects the torsion of the optical cable during the animal movements and releases it with a very high sensitivity. A good electrical signal transmission requires frictional contacts that brake the rotation of the rotary joint. The assistance of this rotary joint helps to counter the resistive force and offers a good transmission of the signal during experiment with freely moving small animals like mice. It comes with 12 electrical contacts and one optical channel with FC receptacles on both ends.
If the experiment requires a really stable output (e.g. miniaturized fluorescence microscopy), we recommend the use of the Pigtailed Assisted Fiber-optic & Electric Rotary Joints (AHRJ-OE_PT_AH_12_HDMI and AHRJ-OE_PT_AH_12_USB-C, see the Miniaturized Fluorescence Microscopy section). These rotary joints have pigtailed input (1 m) and output (0.2 m) fiber-optic patch cords of 200 µm diameter, NA 0.48 with a light weight metal jacket.
The Assisted Fiber-optic & Electric Rotary Joints can be designed with two types of lenses: achromatized doublet (AD) and aspheric 0.53 NA (AH). The achromatized doublets AD allow a near-equal focal distance for wavelengths between 450 nm and 650 nm, minimizing chromatic aberration. Our AD models are designed for use with a 200 µm core, 0.22 NA optical fiber. The 0.53 NA aspheric AH is optimized for reduced optical aberration. It is designed for use at a wavelength of 470 nm.
Contact us to discuss the possibility of custom wavelengths and NA.
• The holder for the Assisted Fiber-optic & Electric Rotary Joint is included (Holder_ARJ).
• The output fiber-optic patch cords are also included.
• An optional adapter kit can be provided to allow a Harwin-connectorized rotary joint to be used with an Omnetics-connectorized systems (ADAPTER_HO12).
|Input NA||0.22 or 0.5|
|Output NA||0.22 or 0.5|
|Harwin Electrical Connector||Male Datamate L-Tek, 2 mm pitch, 2 rows of 12|
|HDMI Electrical Connector||Female Blackrock 2 Pinout, Microscope Pinout|
|Number of contacts||12|
|Contact resistance||Less than 500 mOhm|
|Resistance variation during rotation (constant rotation)||Less than 100 mOhm at 5 VDC|
|Maximum current (typical)||2 A per contact|
|Start up torque||Less than 20 µN·m|
|Rotation speed||Up to 300 rpm|
|Outer Diameter||56 mm|
|Note||Tested with 200 µm core NA 0.22 fiber-optic patch cords|
The simplest form of the patch cord is a piece of fiber with buffer coating and two ferrules on its ends. So far, the most popular fiber in optogenetics research is a fiber with a 200 µm core diameter and NA 0.22. Ideal for laser. #.#: Fiber length (m)
The simplest form of the patch cord is a piece of fiber with buffer coating and two ferrules on its ends. Ideal for LED. #.#: Fiber length (m)
This adapter kit allows a Harwin-connectorized rotary joint (12 channels) to be used with an Omnetics-connectorized systems (12 channels).