Patent ID: 11879823
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 0:
1. A filter substrate for filtering and optical characterization of microparticles, comprising a wafer with a thickness of at least 100 μm and a transmission degree of at least 10% for radiation in the wavelength range of 2,500 nm to 15,000 nm, the surface of the front-side and/or the surface of the rear-side of the wafer being provided, completely or in regions, with an antireflection layer which prevents an optical reflection of radiation in the wavelength range of 200 nm to 10,000 nm, and the wafer having, at least in regions, filter holes with a diameter of 1 μm to 5 mm.