Description

The equipment supplied comprises an arrangement of energy sources, measuring instruments, aperture plates, filter plates and target plates, which are mounted on a linear track, in different combinations to suit the particular laboratory teaching exercise chosen.

• The track consists of a rigid aluminium frame with twin horizontal rails which incorporates sliding carriages to enable the positions of the instrumentation, filters and plates to be varied

• The heat source consists of a flat copper plate 100mm diameter, which is heated from the rear by an insulated electric heating element operating at low voltage for increased operator safety

• Heater can be voltage or PID controlled allowing for the temperature set-point to be achieved rapidly and maintained within 0.1°C

• The front of the plate is coated with a heat-resistant matte black paint which provides a consistent emissivity close to unity

• The surface temperature of the plate is measured by a thermocouple, which is attached to the front of the plate

• Radiation from the heated plate is measured using a heat radiation detector (radiometer), which can be positioned along the graduated track on the carriage

• Two cork-coated metal plates are supplied that enable a vertical slot aperture of adjustable width to be created between the source and detector to demonstrate area factors

• The position of the carriages relative to the energy source can be measured using a graduated scale attached to the side of the track

• Metal plates with different surface finishes are supplied to demonstrate the effect of emissivity on radiation emitted and received. Two black plates, one grey plate and one polished plate, supplied together with a track-mounted carrier which positions the plates in front of the heat source. Each plate incorporates a thermocouple to indicate the surface temperature of the plate

• Plastic filter plates of varying optical density (absorptivity) are supplied to demonstrate the laws of absorption

• The light source consists of a lamp in a housing with a glass diffuser and operates at low voltage for increased operator safety. The source may be rotated through 180° where the angle is measured using an integral scale. The power supplied to the lamp can be varied and measured using the armBUS software

• The radiation from the light source is measured using a light meter which can be positioned along the graduated track on the carriage. Filter plates of varying opacity and thickness are supplied to demonstrate the laws of absorption.

Demonstration Capabilities

• Inverse-square law using the heat source and radiometer or light source and light meter

• Stefan-Boltzmann law using the heat source and radiometer

• Determination of the View Factor

• Emissivity using the heat source, metal plates and radiometer

• The Inverse Square Law for Light

• Kirchhoff’s circuit laws using the heat source, metal plates and radiometer

• Area factors using the heat source, aperture and radiometer

• Lambert’s Cosine Law using the light source (rotated) and light meter

• Lambert’s law of absorption using the light source filter plates and light meter