eMOR-2 - Extended MOR Transmissometer

Application

The eMOR-2 is typically specified for assessment of RVR in applications in airside operational areas such as beside a runway. The eMOR-2 Extended MOR Tranmsimsometer measures visibility using the atmospheric extinction coefficient, which is the sum of the scattering coefficient and the absorption coefficient. The MTECH Transmissometer sensor is the latest in Tranmissometer technology utilizing data from is co-located forward scatter sensor to extend its readings of MOR out to 80,000 Meters.

Deployment Configuration

Transmissometers are mounted in groups of 1, 2, 3 or 4 along the runway, depending on the category of operations on that runway.

Frangible Mounting

The eMOR-2 features an ICAO certified dual frangible aluminium lattice mast, which is bolted to the foundation baseplate. The lattice structure offers superior safety features over other designs utilizing dual concentric steel poles. The optical units mount at the top of the inner support, with the main electronics box mounted on the side of the mast for easy access. The window conditioning fan unit attached to the outer mast provides a heated air curtain for the optical unit windows. This actively maintains the transmissometer window in a clean dry condition.

Light Source

The Transmissometer light source is an ultra high intensity LED light source with light output having broad spectral characteristics similar to white light. The scan is performed every 10 seconds. The LED MTBF is specified for 4 years under continuous low visibility conditions and longer where high visibility conditions prevail over long periods.

Pulsed Light Sensor

The optoelectronics assembly is mounted inside a weather proof sensor enclosure, with a glass front window and integral hood. The sensor is a high stability silicon photodiode, with a linear response over 7 orders of magnitude of light level and the sensor characteristic is compensated by a correction filter, to ensure that the reading conforms closely to the CIE Photopic response centred on 555 Nm. The sensor electronics has integral ambient light compensation, and any errors are minimised by advanced hum, noise and offset cancellation techniques

Advanced control logic

The source acts as master sensor and manages the link to the server. Local operator controls are provided to facilitate ease of setup and maintenance. By the use of these controls four levels of access are available:

Built In Test

All “Built in Test” functions are available at the server by means of the comprehensive Transmissometer Control Message Set. The monitored variables include: Enclosure Temperature, Sensor Temperatures, LED Voltage, Sensor Background level, Background Luminance, Power supply voltage and over 20 reported systems status conditions.

Lightning Protection

World’s best practice lightning protection modules are used in the transmissometer. These modules are mounted on DIN rails for easy replacement. World’s best practice lightning protection modules are used in the transmissometer. These LRU modules are mounted on DIN rails for easy removal or replacement.

Installation

The sensor package includes a complete foundation kit for siting the equipment. The foundation assemblies have been engineered to compliment the frangible design of the sensor mast and also allow ease of installation by qualified personnel. A special foundation kit is provided as an option for sites subject to frost or unstable soils

Alignment

In stable ground, alignment needs only to be made when the system is first installed. Alignment is automated through the sensor software. Replacement optical modules are keyed into the mast mount and tight manufacturing boresight alignment tolerances ensure that alignment need not be repeated when spare optical modules are installed.

Maintenance Requirements

The MTECH eMOR-2 has several unique features that minimize the maintenance effort required for successful deployment of MTECH transmissometer sensors. A typical schedule for maintenance is an inspection every three months to ensure correct operating of the device. The eMOR-2’s air blower reduces overall maintenance requirements by keeping window condition in a very clean state. Whilst other manufacturers “compensate” for particulate matter on their optics, the MTECH eMOR-2 “eliminates”. All modules are LRU and keyed to allow “plug in” replacement for error free maintenance.

Standardization

The eMOR-2 conforms to all relevant ICAO and WMO guidelines in relation to the operation of RVR systems including:ICAO DOC: 9328 AN/908: MANUAL OF RUNWAY VISUAL RANGE OBSERVING AND REPOR TING PRACTICE.

Construction

The transmissometer is fabricated from high quality aluminium and stainless steel. This ensures long lasting performance in even the toughest of marine environments.

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