Introduction: The terahertz ray corresponds to a frequency range between the infrared and the microwave of the electromagnetic spectrum and can penetrate almost all kinds of materials without causing damage. Therefore, the terahertz camera has a wide rang…

Introduction: The terahertz ray corresponds to a frequency range between the infrared and the microwave of the electromagnetic spectrum and can penetrate almost all kinds of materials without causing damage. Therefore, the terahertz camera has a wide rang…