# 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 emissivity of rough surfaces without contact. Gonioreflectometric measurements were conducted for several surface materials. Every HDF5-File contains the thermal images for a 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 Plancks Law. The rotation stage for the integrating sphere moves continuously with 10° per second, and the MWIR camera takes 10 HDR thermal image every second with the fastest possible frame rate to ensure the correctness of the angle.

# 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 and digital values. They are calibrated for a temperature band from 0 to 800 °C.

Each file is divided in 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