Teaching aid and method for demonstrating blackbody radiation Lambert law

Abstract

The invention belongs to the field of heat transfer theory teaching aid equipment, and discloses a teaching aid and a method for demonstrating a blackbody radiation Lambert law in order to solve the problem that in traditional classroom teaching, teachers are difficult to tell and clearly know the Lambert law to students only through traditional teaching means, and the students cannot skillfully master the connotation and application of the Lambert law. The teaching aid comprises a bottom plate, a transparent hemisphere, a semitransparent hemisphere and a light source and is used for demonstrating the concepts of hemisphere space, effective radiation area and Lambert law to students during classroom teaching, and the students observe the light source from different positions of the transparent hemisphere when the light source is turned off during teaching aid demonstration so as to understand the concept of the effective radiation area; when the light source is turned on, the student an observe the brightness distribution of visible light on the semitransparent hemisphere so as to understand the distribution rule of radiation energy on the hemisphere space and further master the content of the Lambert law. The device is simple in structure and convenient to operate, and can effectively help students to understand the blackbody radiation Lambert law.

Description

technical field [0001] The invention belongs to the field of heat transfer teaching aids, in particular to a teaching aid and method for demonstrating Lambert's law of black body radiation. Background technique [0002] Black body radiation theory is compulsory knowledge for energy and power engineering, building environment and energy application engineering, safety engineering and other science and engineering majors in colleges and universities [Tao Wenquan, "Heat Transfer" (fifth edition), Higher Education Press , 2019]. Lambert's law is one of the three laws of blackbody radiation theory. This law describes the distribution of blackbody radiation energy in the space direction. Its content is: the energy radiated by a blackbody per unit area is not uniform in different directions in space. , according to the spatial latitude angle θ It changes with the cosine law, that is, the radiated energy is the largest in the normal direction and zero in the tangential direction, ...

AI Technical Summary

Problems solved by technology

In traditional classroom teaching, it is difficult for teachers to explain Lambert’s law clearly to students only through traditional teaching methods such as multimedia and blackboard writing. However, students’ understanding of the law often stays in the literal meaning, and they cannot master the connotation and meaning of the law proficiently. application

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