The metrology cameras for Subaru PFS and FMOS

TL;DR

This paper discusses the design and role of metrology cameras in the Subaru telescope's PFS and FMOS systems, crucial for precise fiber positioning in large-scale spectrographs.

Contribution

It introduces the design specifications and dual functionality of the metrology cameras for both PFS and FMOS instruments on Subaru.

Findings

Metrology camera achieves <5 μm fiber position accuracy.

Supports over 2400 fibers in a 1.4-degree field.

Enhances fiber positioning precision for spectroscopic observations.

Abstract

The Prime Focus Spectrograph (PFS) is a new multi-fiber spectrograph on Subaru telescope. PFS will cover around 1.4 degree diameter field with ~2400 fibers. To ensure precise positioning of the fibers, a metrology camera is designed to provide the fiber position information within 5 {\mu}m error. The final positioning accuracy of PFS is targeted to be better than 10 {\mu}m. The metrology camera will locate at the Cassegrain focus of Subaru telescope to cover the whole focal plane. The PFS metrology camera will also serve for the existing multi-fiber infrared spectrograph FMOS.