NZ621958B2 - Antenna installations - Google Patents

Antenna installations Download PDF

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Publication number
NZ621958B2
NZ621958B2 NZ621958A NZ62195812A NZ621958B2 NZ 621958 B2 NZ621958 B2 NZ 621958B2 NZ 621958 A NZ621958 A NZ 621958A NZ 62195812 A NZ62195812 A NZ 62195812A NZ 621958 B2 NZ621958 B2 NZ 621958B2
Authority
NZ
New Zealand
Prior art keywords
flow
sensor
enclosure
flow path
dew point
Prior art date
Application number
NZ621958A
Other versions
NZ621958A (en
Inventor
Stephen Charles Powell
Original Assignee
Bae Systems Plc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB1115271.7A external-priority patent/GB2494197B/en
Application filed by Bae Systems Plc filed Critical Bae Systems Plc
Publication of NZ621958A publication Critical patent/NZ621958A/en
Publication of NZ621958B2 publication Critical patent/NZ621958B2/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
    • G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/20—Status alarms responsive to moisture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/02—Arrangements for de-icing; Arrangements for drying-out ; Arrangements for cooling; Arrangements for preventing corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/34—Adaptation for use in or on ships, submarines, buoys or torpedoes

Abstract

antenna installation including an antenna array (10) located in an enclosure (12) which is supplied with dry air supplied directly or indirectly from a dry air source (16), a sensor arrangement located after the enclosure including a dew point sensor (22) disposed in a flow path away from the enclosure, adapted to detect the dew point of atmosphere passing along the flow path, and an air flow sensor (24) adapted to monitor flow along the flow path and to generate an alarm if the airflow falls below a predetermined threshold. losure, adapted to detect the dew point of atmosphere passing along the flow path, and an air flow sensor (24) adapted to monitor flow along the flow path and to generate an alarm if the airflow falls below a predetermined threshold.

Description

ANTENNA INSTALLATIONS This invention relates to antenna installations and, in particular but not exclusively, to antenna installations including one or more antenna arrays, each located in an enclosure each provided with a controlled environment. In typical such installations on board a ship, a dry air panel provides dry air to the enclosures. The dry air panel is designed to ensure that the temperature and humidity of the air or the atmosphere within the environment lie within specific ranges to ensure effective operation of the antenna array in use. The term dry air is used broadly to mean air whose humidity is controlled to be below a predetermined limit. It is known to provide a system where the atmosphere within the sealed environment is sampled and passed to a dew point sensor which determines the dew point of the atmosphere and generates an alarm if the dew point passes a given threshold. Although such a system is effective, we have found that there is a potential problem if for any reason the dew point sensor is not supplied with an air sample because under these conditions the dew point sensor may give an erroneous signal and mask the fact that the atmosphere within the enclosures has deteriorated beyond the operating requirements.
In one aspect, this invention provides an antenna installation including an antenna array located in an enclosure which is supplied with dry air supplied directly or indirectly from a dry air source, a sensor arrangement located after said enclosure including a dew point sensor disposed in a flow path away from said enclosure, adapted to detect the dew point of atmosphere passing along said flow path, and an air flow sensor adapted to monitor flow along said flow path and to generate an alarm if said air flow falls below a predetermined threshold.
Preferably said air flow sensor provides a flow/no flow output signal. 6216343_3.doc Preferably said air flow sensor is located in the flow path downstream of said dew point sensor.
In one arrangement, the antenna installation may include a series of antenna arrays each in a respective enclosure, with a first one of said enclosures in the series receiving dry air from said dry air source, with connecting flow passages provided between adjacent enclosures, and the dew point sensor and the air flow sensor being disposed in a flow path away from a final enclosure in the series.
There is also described herein an antenna installation including an antenna array located in an enclosure which is supplied with conditioned atmosphere supplied directly or indirectly from a dry air source, a sensor arrangement including a dew point sensor disposed in a flow path away from said enclosure, adapted to detect the dew point of atmosphere passing along said flow path, and an air flow sensor adapted to monitor flow along said flow path and to generate an alarm if said air flow falls below a predetermined threshold.
Whilst the invention has been described above, it extends to any inventive combination or sub-combination of novel features disclosed above or set out in the following description, drawing or claims.
The invention may be performed in various ways and, by way of example only, an embodiment thereof will now be described, reference being made to the accompanying drawing which is a schematic diagram of an antenna installation including a remote sensor in accordance with this invention.
Referring to the drawing, a ship-borne antenna installation is illustrated comprising four planar array antenna assemblies 10 mounted in respective enclosures 12. The planar array antenna assemblies 10 are supplied with transmission signals and control signals from a signal data processor 8. 6216343_3.doc Adjacent enclosures are linked by flow connections 14 which allow air flow between the enclosures. Dry air supplied from a dry air panel 16 to a first enclosure 12 and then passes successively through the flow connections 14 to the last enclosure in the series. From the last enclosure the air 12 passes along a dry air return 18, eventually to vent to atmosphere. Before venting, the air passes to a sensor sampling system 20, comprising a dew point sensor 22 and downstream thereof an air flow sensor 24. The dew point sensor 22 and the air flow sensor 24 provide signals to a remote control unit 26. The dew point sensor 22 is selected to signal an alarm to said remote control unit 26 if the dew point temperature falls below a preset value in the range of from -100ºC to +20ºC which is displayed on a dew point alarm 28. Likewise, the air flow sensor 24 signals an alarm if the air flow rate is nil or drops below a preset threshold, with the alarm being displayed on an air flow alarm 30. 6216343_3.doc

Claims (5)

1. An antenna installation including an antenna array located in an enclosure which is supplied with dry air supplied directly or indirectly from a dry air source, a sensor arrangement located after said enclosure including a dew 5 point sensor disposed in a flow path away from said enclosure, adapted to detect the dew point of atmosphere passing along said flow path, and an air flow sensor adapted to monitor flow along said flow path and to generate an alarm if said air flow falls below a predetermined threshold.
2. An installation according to Claim 1, wherein said air flow sensor 10 provides a two state flow/no flow output signal.
3. An installation according to Claim 1 or Claim 2, wherein said air flow sensor is located in the flow path downstream of said dew point sensor.
4. An installation according to any one of the preceding Claims, wherein the antenna installation includes a series of antenna arrays each in a 15 respective enclosure, with a first one of said enclosures in the series receiving dry air from said dry air source, with connecting flow passages provided between adjacent enclosures, and the dew point sensor and the air flow sensor being disposed in a flow path away from a final enclosure in the series.
5. An antenna installation being substantially as hereinbefore 20 described with reference to the accompanying drawing. 6216343_3.doc
NZ621958A 2011-09-05 2012-09-05 Antenna installations NZ621958B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB1115271.7 2011-09-05
GB1115271.7A GB2494197B (en) 2011-09-05 2011-09-05 Antenna Installations
PCT/GB2012/052175 WO2013034901A1 (en) 2011-09-05 2012-09-05 Antenna installations

Publications (2)

Publication Number Publication Date
NZ621958A NZ621958A (en) 2015-12-24
NZ621958B2 true NZ621958B2 (en) 2016-03-30

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