Out-of-Band Measurement of LED-based Solar Blind UV Filters

Solar-blind UV detectors based on wide band gap semiconductors

Solid-state photon detectors based on semiconductors other than silicon are not yet considered mature technology but their current development opens new possibilities, also for space observations. Such devices are especially attractive for ultraviolet radiation detection, as semiconductor materials with band gaps larger than that of silicon can be produced and used as “visible-blind” or “solar-...

Ground Based Measurements of Solar UV Index in Tabriz

Introduction: Ultraviolet index (UVI) is a dimensionless scale, which describes the maximum intensity and biologic effects of UV during a specific time, on surface of the earth. The UVI is  an  international  standard measurement of  the  strength  of sunburn  producing ultraviolet radiation at a particular place and time. This index is an easy and understandable concept for pr...

Tunable Wideband Graphene based Filters in THz Band

In this paper, a procedure for analyzing and designing of tunable wideband band-pass and band-stop graphene based filters in the terahertz band is proposed. These planar wideband plasmonic filters are unique in their kind. With this procedure, it is possible to design filters with the desired functional characteristics in the form of the similar quarter-wavelength resonance stubs. The discontin...

Direct Measurement of Wafer Temperature in White/UV LED Manufacture

ACS CCDs UV and narrow- band filters red leak check

We present results of the observations of the star 15 Mon, obtained with the aim of checking the impact of red leaks in the UV (and U-band) and two narrow-band filters on ACS CCDs. The red leak in the F220W, F250W and F330W filters appears to be smaller than measured in pre-flight tests. We derive updated passbands for the three filters and we present the updated correction table for different ...