Stefan Boltzmann law Measuring the Radiant Intensity of a Black Body as a Function of Temperature

The Stefan-Boltzmann Law Experiment is designed to verify the relationship between the thermal radiation emitted by a black body and its absolute temperature. The apparatus uses a cylindrical electric furnace with a black body cavity that can be heated over a controlled temperature range. The emitted radiation is measured using a Moll's thermopile, while the temperature is monitored using a precision thermocouple. Software-based data acquisition enables accurate measurement and analysis of the experimental results to verify Stefan-Boltzmann's Law. Manufactured by Atico Export India.

Principle

A black body emits thermal radiation whose intensity depends on its absolute temperature. As the temperature of the black body increases, the emitted radiant power increases rapidly according to the Stefan-Boltzmann Law. In this experiment, a black body cavity is heated to different temperatures, and the emitted radiation is measured using a thermopile. The measured radiation intensity is compared with the corresponding temperature to verify the relationship between thermal radiation and absolute temperature.

Objectives

• Verify Stefan-Boltzmann's Law experimentally.
• Study black body thermal radiation.
• Measure radiant power as a function of temperature.
• Analyze the relationship between emitted radiation and absolute temperature.
• Understand the principles of thermal radiation.

System Components

Electric Oven :

• Supply Voltage: 230 V
• Quantity: 1

Black Body Accessory :

• Quantity: 1

Safety Connecting Box :

• With Earth
• Quantity: 1

Support for Electric Oven :

• Quantity: 1

Data Acquisition Interface :

• Quantity: 1

Data Analysis Software :

• Quantity: 1

Type K Temperature Probe :

• Diameter: 1.5 mm
• Quantity: 1

µV Sensor :

• Quantity: 1

Moll's Thermopile :

• Quantity: 1

Optical Bench :

• Standardized Profile
• Length: 1 m
• Quantity: 1

Optics Rider :

• Quantity: 2

Optics Rider :

• Quantity: 2

Cantilever Arm :

• Quantity: 1

Universal Clamp :

• Capacity: 0 to 80 mm
• Quantity: 1

Connecting Leads :

• Current Rating: 19 A
• Length: 100 cm
• Red/Blue Pair
• Quantity: 1

Immersion Pump :

• Quantity: 1

Low Voltage Power Supply :

• Output: 3 / 6 / 9 / 12 V
• Quantity: 1

Silicone Tubing :

• Diameter: 7 mm
• Length: 1 m
• Quantity: 1

Wide-Mouthed Can :

• Capacity: 10 L
• Quantity: 1

Black Body Radiation Source :

• Cylindrical brass black body provides uniform thermal radiation.

Controlled Heating :

• Electric oven heats the black body over a temperature range of 300 K to 750 K.

Accurate Temperature Measurement :

• Type K thermocouple provides precise temperature monitoring.

High-Sensitivity Radiation Detector :

• Moll's thermopile measures emitted thermal radiation accurately.

Software-Based Data Acquisition :

• Supports real-time measurement and analysis using data acquisition software.

Water-Cooled Shield :

• Minimizes unwanted thermal radiation from surrounding components.

Educational Design :

• Ideal for studying thermal radiation, black body emission, and heat transfer.