1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/ARP5623 AEROSPACE RECOMMENDED PRACTICE ARP5623 Issued 2013-02 Mobile Digital Infr
5、ared Pavement Surface, Ambient Air and Dew Point Temperature Sensor System RATIONALE This SAE Aerospace Recommend Practice is intended to provide airport operators a basic understanding and set of requirements for a vehicle mounted electronic system to provide the end user with real-time readings of
6、 surface, air, and dew point temperatures of airfield pavement areas including runways, taxiways, ramps, bridges, vehicular roadways, parking garages, and parking lots. TABLE OF CONTENTS 1. SCOPE 2 2. APPLICABLE DOCUMENTS 2 2.1 SAE Publications . 2 2.2 FAA Publications . 2 3. TECHNICAL REQUIREMENTS
7、2 3.1 General Description 2 3.2 Temperature Sensors . 2 3.3 Digital Display Unit 3 4. VEHICLE MOUNTED SENSORS . 3 4.1 Performance 3 4.2 Design . 4 4.3 Radio Frequency Hardening . 4 4.4 Infrared Pavement Temperature Sensor Requirements . 4 4.5 Infrared Sensor Specifications 4 4.6 Ambient Air Temperat
8、ure Sensor Requirements 5 4.7 Ambient Air Temperature Sensor Specifications 5 4.8 Dew Point Temperature Sensor Requirements (Optional) . 5 4.9 Dew Point Temperature Sensor Specifications 5 4.10 Digital Display Unit 5 4.10.1 Performance 5 4.10.2 Design . 6 4.11 Infrared Pavement Surface Sensor Calibr
9、ation and Preventative Maintenance 7 5. SYSTEM MANUAL . 7 6. PRODUCT SUPPORT 7 7. ACCEPTANCE 7 8. NOTES 8 SAE ARP5623 Page 2 of 8 1. SCOPE This SAE Aerospace Recommended Practice (ARP) covers the requirements for a combined Mobile Digital Infrared Pavement Surface, Ambient Air, and Dew Point Tempera
10、ture Sensing System (referred to as the system). The system monitors real-time surface, air and dew point temperatures of airfield pavement areas to ensure safe winter ground operations of aircraft and other vehicles. The vehicle mounted electronic system provides the operator with real-time reading
11、s of surface, air and dew point temperatures of airfield pavement areas including runways, taxiways, ramps, bridges, vehicular roadways, parking garages and parking lots. The electronic system shall be available with or without the dew point sensing option. This electronic system can be utilized as
12、a stand alone system at small airports, or may be used to augment airport operations that currently have a Stationary Runway Weather Information System (reference ARP5533). Because the electronic system is mobile, it can be utilized to measure pavement temperatures at locations where an in-pavement
13、sensor or weather station is not located. 2. APPLICABLE DOCUMENTS The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purch
14、ase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1 SAE Publications Available f
15、rom SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. ARP5533 Stationary Runway Weather Information Systems (In-Pavement) 2.2 FAA Publications Available from Federal Aviation Administration, 800
16、 Independence Avenue, SW, Washington, DC 20591, Tel: 866-835-5322, www.faa.gov. Latest Edition - AC 150/5200-30C: “Airport Winter Safety and Operations” 3. TECHNICAL REQUIREMENTS 3.1 General Description The full electronic system shall consist of the following components (not all components are requ
17、ired for a basic system) (see Figure 1). 3.2 Temperature Sensors The electronic system shall include a mobile infrared pavement surface temperature sensor, an ambient air temperature sensor, and (an optional) dew point temperature sensor. The sensors are typically mounted on airfield operations or m
18、aintenance vehicles (such as patrol vehicles, anti-icing trucks, friction testers, plows, multifunction vehicles, etc.). These types of vehicles drive on airfield pavements where the system data is extremely useful in making important winter maintenance and operations decisions. These decisions incl
19、ude determining the type and application of anti-icing chemicals, and the correct snow removal techniques to utilize to maintain acceptable pavement surface friction readings. The optional dew point sensor enables the operator to predict when atmospheric and pavement conditions are favorable for for
20、mation of frost or black ice on the surface of the pavement. SAE ARP5623 Page 3 of 8 FIGURE 1 - SYSTEM COMPONENTS 3.3 Digital Display Unit The digital display unit is required to display real-time measured temperature parameters to the operator on a high intensity LED screen, (see 4.10.2). The digit
21、al display is also used by the operator of the vehicle to control the system features, and to calibrate the system for accuracy. The digital display unit is mounted in the cab of the vehicle in direct sight of the driver. 4. VEHICLE MOUNTED SENSORS 4.1 Performance The mobile infrared pavement surfac
22、e temperature sensor shall sense and electronically transmit pavement surface temperature to the digital display unit for dissemination of the real-time data to the vehicle operator. Additionally, the ambient air temperature sensor shall sense and electronically transmit air temperature to the digit
23、al display unit. Optionally, a dew point sensor shall sense and electronically transmit dew point temperature to the digital display unit. SAE ARP5623 Page 4 of 8 4.2 Design Sensors shall be solid state in design without relays, tubes or other electromechanical devices. The infrared pavement sensor
24、shall have the capability to be field calibrated by the user to maintain accuracy. The ambient air temperature and dew point temperature sensors shall be factory calibrated and no adjustment or calibration shall be required by airport users. The system shall be supplied with removable/repairable com
25、ponents and sensors for ease of troubleshooting and repair to extend the life of the electronic system. The system design should not be an all-in one design and shall not be considered throw away technology (i.e., when a malfunction occurs, the system is discarded and replaced with an entire new sys
26、tem instead of repairing system components). 4.3 Radio Frequency Hardening The entire system including the three sensors, digital display and interconnection cables shall be manufactured with shielding and filter circuitry to be resistant to radio frequency interference. This type of design is known
27、 as “radio frequency hardening”. Radio signals are prevalent on an all airfields, and operations patrol vehicles can contain multiple radio transmitting sources. Therefore, radio frequency hardening is particularly important to shield the system electronics from radio frequency induced noise and int
28、erference which could otherwise degrade the system operation and accuracy. 4.4 Infrared Pavement Temperature Sensor Requirements The mobile infrared pavement temperature sensor shall be constructed only with an optically polished germanium crystal lens which the pavement infrared radiation is measur
29、ed through. This type of lens greatly increases system accuracy by passing the infrared signal through with no attenuation, and it also filters out unwanted wavelengths of light. Lenses fabricated of glass or plastic will not pass infrared without attenuating the signal and negatively impacting the
30、pavement temperature reading accuracy, making them unsuitable as a material for lens construction. The mobile infrared pavement temperature sensor shall be constructed with a tapered, injection molded cone, protective housing. The housing shields the sensor lens from contamination by vehicle tire-sp
31、ray and other contaminants. CAUTION: Any solid matter contamination which collects on the sensor lens will be measured the same as the pavement surface, thus decreasing measured pavement accuracy significantly. The cone housing shall be removable for the user to periodically clean the lens with a no
32、n-abrasive lens cleaner. The mobile infrared pavement temperature sensor shall have the capability of being installed remotely from the digital display with a cable of up to 100 feet long. This enables the installer to custom mount the sensor on a wide variety of snow removal vehicle types to measur
33、e pavement temperature with the greatest accuracy to overcome contaminant problems with the lens. It also provides flexibility to mount the sensor at a wide variety of locations on the vehicle under-body. 4.5 Infrared Sensor Specifications The purpose of this system is to measure and detect in real-
34、time the presence of an imminent freezing pavement condition. Therefore, the accuracy and repeatability of the infrared sensor portion of the system is extremely important. The infrared probe shall be designed to contain a temperature compensation circuit to increase the surface temperature reading
35、accuracy in all types of climates. For example, without such compensation, a host vehicle driven out of a warm garage into colder temperatures could take up to an hour to stabilize for accurate readings. The mobile infrared pavement surface sensor shall have sufficient durability to function over a
36、range of air temperatures from -40 to 160 F (-40 to 71.1 C). Accuracy of the sensor shall be 0.5 F (0.28 C) at 32 F (0 C) in operating ambient from 0 to 120 F (17.8 to 48.9 C). Accuracy of the sensor out of the normal stated range shall be 3.0 F (1.0 C). The system shall have an operating relative h
37、umidity range of 0 to 100%. The infrared sensor shall be capable of attaining a measured repeatability of 0.1% of full scale. Field calibration shall have an adjustable range of 5.0 F (2.8 C) at 32 F (0 C). SAE ARP5623 Page 5 of 8 4.6 Ambient Air Temperature Sensor Requirements The ambient air tempe
38、rature sensor shall have the capability of being installed on the host vehicle, remotely from the digital display, with a cable of up to 100 feet long. This allows for mounting of air temperature sensor at locations such as the vehicle front grill, away from heat sources on the vehicle, such as engi
39、ne heat, exhaust and direct sunlight. This enables the installer to custom mount the sensor on a wide variety of vehicle types to measure air temperature with the greatest accuracy. CAUTION: The air temperature sensor must always be mounted where good airflow occurs when the vehicle is in motion. It
40、 must never be mounted in a location where direct sunlight can shine on it. 4.7 Ambient Air Temperature Sensor Specifications The ambient air temperature sensor shall have sufficient durability to function over a range of air temperatures from -40 to 160 F (-40 to 71.1 C). Accuracy of the air temper
41、ature sensor shall be 0.5 F (28 C) at 32 F (0 C) in operating ambient from 0 to 120 F (17.8 to 48.9 C). Accuracy of the sensor out of the normal stated range shall be 3.0 F (1.0 C). The system shall have an operating relative humidity range of 0 to 100%. 4.8 Dew Point Temperature Sensor Requirements
42、 (Optional) When the system includes the optional dew point sensor, both the dew point sensor and the air temperature sensor are mounted inside a white reflective plastic housing. The housing has an air intake to provide air flow to the both sensors, and shields them from sunlight and other sources
43、of heat, while the vehicle is in motion. The housing should be mounted to face forward so the air intake points in the direction of vehicle travel. The dew point sensor shall have the capability of being installed on the host vehicle, remotely from the digital display, with a cable of up to 100 feet
44、 long. This enables the installer to custom mount the housing on a wide variety of vehicle types to measure dew point and air temperature with the greatest accuracy. The dew point housing must always be mounted where good airflow occurs when the vehicle is in motion. Suggested mounting locations inc
45、lude the vehicle hood, plow mirror, or on top of the truck cab housing. The dew point sensor shall be supplied factory calibrated and shall not require any calibration or setup to take accurate readings. The housing air intake must always be kept clear of snow/ice or other debris which could cause t
46、he unit to react too slowly to take accurate readings. The dew point housing includes a replaceable filter, which should be checked once a year and replaced if dirty. Exposure to extreme amounts of chemicals or dust could cause the filter to clog and the unit performance to degrade until replaced. 4
47、.9 Dew Point Temperature Sensor Specifications The dew point sensor shall have sufficient durability to function over a range of air temperatures from -40 to 160 F (-40 to +71.1 C). Accuracy of the dew point sensor shall be 3.0 F (1.0 C) at 32 F (0 C) at relative humidity values of greater than 70%.
48、 Accuracy of the sensor out of the normal stated range shall be 3.0 F (1.0 C). The system shall have an operating relative humidity range of 0 to 100%. 4.10 Digital Display Unit 4.10.1 Performance The system shall be supplied with an integrated high intensity LED display to allow the driver of the h
49、ost vehicle to view the system data, turn on/off alarms, control and calibrate the system via menu access. The display shall be mounted in the cab of the vehicle in direct sight of the operator. SAE ARP5623 Page 6 of 8 4.10.2 Design The digital display housing shall contain a high intensity LED read-out for display of real-time system information. The LED read-out shall be easily discernable by the
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