选型：
BA3-Si-USB: 3-blades, Si detector 5mm circular
BA7-Si-USB: 7-blades, Si detector 9mm square
BA3-UV-USB: 3-blades, UV-Si detector 5mm circular
BA7-UV-USB: 7-blades, UV-Si detector 9mm circular
BA3-IR3-USB: 3-blades, InGaAs detector 3mm circular
BA3-IR3E-USB: 3-blades,InGaAs Enhanced 3mm circular
BA7-IR3-USB: 7-blades, InGaAs detector 3mm circular
BA7-IR3E-USB: 7-blades, InGaAs Enhanced 3mm circular
BA3-IR5-USB: 3-blades, InGaAs detector 5mm circular
BA7-IR5-USB: 7-blades, InGaAs detector 5mm circular
可选附件：
SAM3-B Beam Sampler: with mounting adapter Sampling reduction factor 0.0016 average
BA-Fiber: A fiber adapter with an FC connector
BA-Mount: A mount enabling head rotation about the optical axis
