# Gonioreflectometric measurements for following surface materials in German and English

1. Alu_Eloxiert.zip | Aluminium eloxiert  | Aluminum anodized
2. Aluminium_Geschliffen.zip | Aluminium geschliffen | Sanded alumiminum
3. Aluminium.zip | Unbehandeltes Aluminium | Untreated aluminum
4. Aluminium_Sandgestrahlt.zip | Aluminium sandgestrahlt | Sandblasted aluminum
5. Edelstahl.zip | Edelstahl | Stainless steel
6. Edelstahl_Gebuerstet.zip | Gebürsteter Edelstahl | Brushed steel
7. Kupfer.zip | Kupfer | Copper
8. Messing.zip | Messing | Brass
9. Referenzlack_Glatt.zip | Unbehandelte Aluminiumoberfläche mit Referenzlack lackiert | Untreated aluminum surface with reference coating (called Reference coating (smooth) in the paper)
10. Referenzlack_Rau.zip | Sandgestrahlte Aluminiumoberfläche mit Referenzlack lackiert | Sandblasted aluminum surface with reference coating (called Reference coating (rough) in the paper)
11. Stahl_Verzinkt.zip | Verzinkter Stahl | Galvanized Steel
12. Stahl_Sandgestrahlt.zip | Stahl sandgestrahlt | Sandblasted Steel

# Description

A gonioreflectometer for the mid-wavelength infrared range was built to measure the directed emissivity of rough surfaces without contact. Gonioreflectometric measurements were conducted for several surface materials and conditions. Each HDF5 file contains the thermal images for a single camera angle and incident angles from 1° to 90°, with open and closed chopper. For the camera angle of 15°, the data for incident angles from 3° to 87° degree is usable. Usable is the data from 1° to 87° for Camera angles of 20°, 30°, 40°, 45°, 50°, 60°, 70°, 80°, 85°. The thermal images are available as temperature values in °C, radiance value in W/sr/m^2 and digital values. The radiance values are determined via Planck's law. The rotation stage for the integrating sphere turns continuously with 10° per second, and the MWIR camera takes 10 HDR thermal images every second.

# Data structure

Extract the zip. 
The thermographic images can be found in HDF5 format under */h5/*.h5
The names range from 0 to 9 for camera angles 15, 20, 30, 40, 45, 50, 60, 70, 80, 85.
Each file contains data of an high dynamic range (HDR) thermal image for temperature in °K, radiance in W/sr/m^2 and digital values. They are calibrated for a temperature band from 0 to 800 °C.

Each file is composed of two parts: The first 90 thermal images are with active illuminating of the surface material and the second 90 thermal images are without illumination (active chopper)

# Usage

import h5py
import numpy as np 

hf = h5py.File(r"...\Aluminium\h5\0.h5", mode='r')
hf_radiance = hf['Radiancedata']
hf_open_chopper = hf_radiance[:90]
hf_closed_chopper = hf_radiance[90:]

# Support
email: hoschang.noori@mrt.uni-kassel.de