Abstract: A brake system to couple between brakes and actuators provides a modular format that allows a plurality of braking modules to be coupled together at interfaces and coupled to other modules to handle a variety of different braking scenarios. Each braking module includes a housing forming a manifold for the delivery of fluid to the interfaces of the modules for exchange between the modules. The braking modules include a hydraulic valve coupled with a pressurized fluid source for delivering fluid to implement a braking function. The modules also include an electro-hydraulic valve configured for receiving electrical input signals and configured for delivering fluid from the pressurized fluid source to the hydraulic valve at an actuation pressure that is proportional to the system pressure based on the levels of the received electrical input signals.

Abstract: A brake system to couple between brakes and actuators provides a modular format that allows a plurality of braking modules to be coupled together at interfaces and coupled to other modules to handle a variety of different braking scenarios. Each braking module includes a housing forming a manifold for the delivery of fluid to the interfaces of the modules for exchange between the modules. The braking modules include a hydraulic valve coupled with a pressurized fluid source for delivering fluid to implement a braking function. The modules also include an electro-hydraulic valve configured for receiving electrical input signals and configured for delivering fluid from the pressurized fluid source to the hydraulic valve at an actuation pressure that is proportional to the system pressure based on the levels of the received electrical input signals.

Abstract: A tuneable fibre grating transmission filter (10) comprising an optical fibre (12) including a grating section (14) in which a fibre Bragg grating (16) having one or more phase-shifts within its periodic refractive index variation, is provided, and tuning means, in the form of mechanical tuning apparatus (18), to which the grating section (14) is coupled. The tuning apparatus (18) is operable to apply a variable axial strain to the grating section (14) to thereby tune the wavelength of the grating (16). The fibre (12) may be optically coupled to a second fibre, including a second grating section in which a broadband transmission filter inn the form of chirped fibre Bragg grating is provided. The chirped grating has a spectral profile including a pass band of substantially the same bandwidth and covering substantially the same wavelengths as the stop bands and the pass band of the phase-shifted grating (16).