Standard Optical Pick-up
The Optical Pick-Up unit is designed to be temporarily fitted for aircraft testing purposes.
Description
The Optical Pick-Up unit is used to produce a speed reference signal from a rotating component for timing and indexing purposes. OPUs 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 OPUs 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 infrared 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 a 25x25 mm target 75 to 200 mm for reflective paint with a 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 | Red lamp in the presence of the target |
| EMC | RTCA/DO-160G |
Electrical specification | |
| Connector | MIL-DTL-26482 (Example mating connector: 62GB-51T08-04S) |
| Electrical Interface | One TTL-compatible output. (Max sink/source current 10mA) |
| 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 48 mm (excluding mating connector) x 25 mm |
| Weight | 83 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 | 007923 |
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