Concept
Pacific Ocean Neutrino Experiment Calibration Module
| URI | http://vocab.nerc.ac.uk/collection/L22/current/TOOL2225/1/ | ||
|---|---|---|---|
| Within Vocab | SeaVoX Device Catalogue | ||
| Alternative Labels | P-ONE_P-CAL | ||
| Definition | A pair of glass hemispheres containing photomultiplier tubes as well as optical and acoustic calibration systems that acts as a hybrid module for detection and calibration within the Pacific Ocean Neutrino Experiment (P-ONE) large-volume neutrino telescope. Multiple Calibration Modules (P-CALs) will be deployed on instrumented mooring strings as integrated calibration instruments but also to avoid blind spots along the detector string. Data provided by P-CALs are used to measure the real-time relative positions of modules within the moorings, help to monitor the efficiency of the modules, and provide information on the optical properties of the seawater. Each 17 inch borosilicate glass hemisphere contains 4 photomultiplier tubes (PMTs) and a plastic shroud that acts as a mounting platform for calibration components and shields the PMTs from diffuse light flashes . A diffusing PTFE sphere allows the creation of isotropic flashes and is used for optical calibration. Five high-power nanosecond light pulsers positioned below the diffuser provide a choice of wavelength and pulse properties of the flash. The PTFE diffuser is optically coupled to the glass of the hemisphere using a fill of optical gel to minimise unwanted refractions at the glass interface. Ten beamed sub-nanosecond light flashers are also integrated into each module to measure time synchronisation between instruments, light scattering, and spectral dispersion. The acoustic positioning system uses piezo-based acoustic receivers acoustically coupled to the glass hemispheres to detect signals from acoustic transceivers distributed on the seafloor. This allows precise monitoring of the mooring string and module positions. A photodiode and silicon photomultiplier are present in each module for self-monitoring of module efficiency and flash timing. The module also hosts a CMOS camera to monitor sedimentation and biofouling levels on the instrument and to monitor bioluminescence events. Each module has several temperature, pressure, humidity, acceleration, and magnetic field sensors for continuous system monitoring. | ||
| Date | 2025-10-09T09:47:39 | ||
| Identifier | SDN:L22::TOOL2225 | ||
| Note | accepted | ||
| Is Version Of | TOOL2225 | ||
| version | 1 | ||
| Broader | L05:399 |
Cherenkov detectors | |
| Related | L35:MAN0357 |
Pacific Ocean Neutrino Experiment | |
B75:ORG02131 |
Technical University of Munich, Department of Physics | ||
Alternate Formats
Other formats for this page:
RDF/XML Turtle JSON-LDAlternate Profiles
Other views of this page:
Alternate Profiles ?Different Media Types (HTML, text, RDF, JSON etc.) and different information model views, profiles, are available for this resource.
NVS html view ? Default NVS html view.
