研究目的
To design a fast high-density robotized fiber positioner system for massive spectroscopic surveys that is compact, robust, and can be coordinated for high spatial density, with high absolute accuracy to remove the need for a metrology system and reduce reconfiguration time.
研究成果
The proposed design allows the positioners to accomplish their task for astrophysical surveys, particularly for the MOONS instrument. The positioners achieve the required precision without an external metrology system, minimizing reconfiguration time. However, further testing is needed for operational temperature, humidity, max Z error, lifetime, and certain tilt errors.
研究不足
The operational temperature, humidity, max Z error, lifetime, and certain tilt errors (ground–alpha and beta–ferrule) still need further testing. The assumptions about the beta–ferrule tilt error need verification. A consistent assembly process for mass production also requires development.
1：Experimental Design and Method Selection:
The design includes a SCARA-like planar kinematics for fiber positioning, with two rotational degrees of freedom for movement in X and Y directions. The design is based on the requirements of the MOONS instrument but is adaptable to other projects.
2：Sample Selection and Data Sources:
Ten prototypes were built and tested to evaluate the performance of the design.
3：List of Experimental Equipment and Materials:
The prototypes used 8 mm brushless motors with backlash-free reduction gears (preloaded double spur gear train) with a ratio of 650:1. A custom-designed test bench was used for performance measurement.
4：A custom-designed test bench was used for performance measurement.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The performance was measured in terms of positioning precision and tilt using a backlit multimode fiber and a camera for XY position measurement, and an optical bench for simultaneous measurement of position and tilt.
5：Data Analysis Methods:
The calibration parameters and non-linearity were used to generate motor commands for a grid of test targets. The rms of the absolute error was calculated for each positioner.
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