Multi-channel Forj And Harsh Operating Environment Common Problems with Fiber Optic Rotary Joint

Date: 2018-11-02 19:20:38

      The multichannel forj is highly complex than conventional FORJ or for that a conventional slip ring as there is an increased number of the component which is added to the multichannel FORJ. Now, the one side of the coin, it seems as the sophistication of the device might enhance the performance level, which is true to a large extent. But on the other side, the addition of a new component makes the whole mechanism complex. The additional level of complexity is the cause of failure, which initially is hard to figure out, but the effect of the complex system shows on the performance of the device.


      The multichannel FORJ does not introduce a problem in terms of general complexity. There is another facet to it as well which is related to design and alignment of the component. In most of the average single FORJ channel, the design cue is quite simple, which in turn makes the design alignment of the component quite simple. But in the case of multichannel FORJ, the design cue is quite complex as discussed earlier, which makes the alignment of components a tough task. If there is any misalignment of the components, then the efficiency factor of the device goes for a toss. The signal loss almost becomes innate and the type of signals that are lost during transmission include PDL, PMD, and WDL.

Problem of crosstalk

      The problem of crosstalk is also a byproduct of using the multichannel FORJ. The slip ring manufacturer and the technicians have come up with the statement that the crosstalk phenomenon occurs when there is a signal interference in the adjoining channels. This leads to an increase in the S/N ratio or commonly referred to as the sound to noise ratio. The level of crosstalk can be calculated using the equation S/N = 10^(S/10). In the given equation S refers to the signal strength in dB and the S/N ratio, which as earlier mentioned, is the sound to noise ratio measured in decibels. According to the set standards, a Crosstalk of 60 decibels refers to the fact that the noise level is one part to the base of one million.


Problems posed by the harsh environment

      As in the case of modern slip rings which includes advanced slip ring technology to deal with the harsh environment. Same is the case FORJ, but with just a few crucial changes. In case of a modern slip rings the conditions are not as harsh when compared to a FORJ. Like the turbine based slip rings, the FORJ also is used in fields which test its metal in harsh condition. Some of them include mines, ships, and oil rigs.


      To deal with such harsh condition the FORJ unit includes protection seals. The quality standards comply with rating conferred upon them by the international protection system. The system encapsulated two-digit ratings in which the first digit refers to the protection against a solid object and the second one refers to the protection from liquid elements.

Reference Parts# of Slip Rings as below:
MB120 series IndustrialBus Slip Rings
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MMC118 series Miniature Slip Rings
MT1256F series Through Bore Slip Ring
MT3899 series Rotating Slip Ring | Electrical Rotating Connector
MFO600A series Fiber Optic Rotary Joints(optional+Electrical Slip Rings)

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