High Performance Optical Pick-up
The High-Performance OPU has been specifically designed for permanent installation on board aircraft and has proven performance and reliability as part of many HUMS installations.
Description
The HP OPU complies with EMC and environmental requirements of Mil-Std 810E, Def Stan 59 41, BS.3G.100, and RTCA DO160C. It also meets the interface requirements of the Rotorcraft Industry Technology Association (RITA).
It is used to produce a speed reference signal from a rotating component for timing and indexing purposes. OPU’s have an operating range of up to 2 meters and can be used to simplify installation when the use of an MPU is not practical or safe. Helitune OPU’s have been specifically designed for aircraft installations and are ideally suited for use on helicopter tail rotors and high-speed transmission shafts.
The Optical Pick-Up unit works by transmitting a beam of infra red light, which is reflected back to the unit by the passing of a target of reflective tape or paint attached to the rotating component. An electrical pulse is produced each time the target comes into view and the red LED indicator illuminates the OPU body. This signal is used to generate a speed output and a timing reference for balance data, vibration signatures, and tracking information.
Product Specification
| Sensing Speed Range | 3 to 50,000 rpm (subject to min. target passing period of 50µs) |
| Sensing Distance | 20 to 1000 mm for reflective tape with 25x25 mm target 75 to 200 mm for reflective paint with 25x25 mm target |
| Timing Resolution | 0.25º (<6000 rpm), 7µs (<6000 rpm) @ 120 mm with reflective paint |
| MTBF | 38,000 hours |
| Operating Temperature Range | -40º C to +70º C |
| Indicators | Green lamp in presence of power, |
| EMC | Def-Stan 59-41 |
Electrical Specification | |
| Connector | MIL C 38999 Series III |
| Electrical Interface | One TTL compatible output. One AS5392 (formally RITA) compatible switch output |
| Power Supply | +10 to +30V DC, at 100mA max. Reverse polarity protection |
| Isolation | 10M ohm @ 100V (case to electronics) |
Physical Specification | |
| Size | 56mm (Including stud) x 53 mm (excluding mating connector) x 25 mm |
| Weight | 85 grams, including 2 locking nuts |
| Fixing | 16 mm long stud concentric with the sensing elements with 5/8 UNF thread |
| Sealing | DIN 40 050 ip65 |
| Helitune Part Number | 386020 |
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