Application of FORJ Technology in Photoelectric Tracking Equipment

July 2, 2020
Latest company news about Application of FORJ Technology in Photoelectric Tracking Equipment

In the design of the photoelectric tracking equipment, to realize the connection between the fiber that rotates with the tracker and the fiber that fixed in the non-rotating vertical axis, The fiber optic rotary joint (FORJ) technology has been applied, which makes the optical signal be transmitted correctly under the fiber rotating status. The normal method that applying the double-channel FORJ has been introduced, based on which, a method applying single-channel FORJ and double-direction optical module has been carried out to improve the transmission quality and simplify the design structure. The insertion loss of the applied FORJ is less than 2dB and the maximum rotary speed can be up to 1000rpm. Meanwhile the design of the optic channel realizes the double-direction signal transmission with rotating movement in single route fiber. The real work shows that the signal of the equipment can be transmitted correctly.

To improve the transmission quality of the digital singal and increase the bandwidth of viedeo signal, the optical fiber is used in photoelectric tracking equipment, so that there is an optical signal transmitted between the fixed base and the free torated platform. The FORJ technology is applied here. FORJ technology is an advanced fiber optic rotary coupling techniquies used in optical fiber communication recently, mainly implemented through a variety of fiber optic rotary connector. The FORJ is also known as the "optic smooth ring" or "fiber-optic ring", in which the optical singal can be transmitted to the fixed optical device on the other end from the plan of arbitrary rotation on one end, and this can maintain continuous optical signal transmission in the state where the fiber torate along th rotation axis.
According to the correlative information, the classfication of fiber optic rotary joint has reached dozens. In this paper, the FORJ applied in the equipment is a singal-channel fiber optic rotary joint with the use of self-focusing lens, and its structure is shown in Fig. 1.
A passive signle-channel FORJ with self-focus lens can realize the couple between fiber optic and self-focus lens directly, and reduce the collimation alignment difficulty. The auto light collimate characteristics of the self-focus lens reduces the loss of the optical signal.