Abstract: A terahertz spectrum test device and system includes a femtosecond fiber laser configured to generate a pump light and a probe light. The pump light excites a terahertz transmitter to generate terahertz waves which are transmitted to a sample suspension device to irradiate a suspended to-be-tested sample, and the probe light is directly transmitted to a terahertz detector. The terahertz detector receives the terahertz waves transmitted from the sample suspension device, and then transmits the terahertz waves and the probe light together to a signal processing circuit to obtain a corresponding terahertz time-domain spectrum. By adoption of the terahertz spectrum test device and system, the to-be-tested sample need not be fixed with a clamp or other instruments, so that terahertz waves will not irradiate to the instrument used for fixing the to-be-tested sample during a terahertz spectrum test, which may otherwise affect the test result.

Abstract: A terahertz spectrum test device and system includes a femtosecond fiber laser configured to generate a pump light and a probe light. The pump light excites a terahertz transmitter to generate terahertz waves which are transmitted to a sample suspension device to irradiate a suspended to-be-tested sample, and the probe light is directly transmitted to a terahertz detector. The terahertz detector receives the terahertz waves transmitted from the sample suspension device, and then transmits the terahertz waves and the probe light together to a signal processing circuit to obtain a corresponding terahertz time-domain spectrum. By adoption of the terahertz spectrum test device and system, the to-be-tested sample need not be fixed with a clamp or other instruments, so that terahertz waves will not irradiate to the instrument used for fixing the to-be-tested sample during a terahertz spectrum test, which may otherwise affect the test result.

Abstract: An air duct includes a base and a latching portion extending from the base. The base includes a resilient portion and two blocking plates. The latching portion is configured to receive a fan. The resilient portion is elastic deformable to fasten the base to the fan. The latching portion defines a ventilation hole for air flowing through in a first direction. The two blocking plates are configured to prevent the air from flowing back to the ventilation hole in a second direction opposite to the first direction. A cooling module with the air duct and an electronic device with the air duct are further disclosed.

Abstract: An electronic device enclosure includes a side plate and a strengthening plate. The side plate includes a main body, a first mounting flange extending from a first edge of the main body, and a second mounting flange extending from a second edge of the main body. The first mounting flange defines a first clipping hole, and the second mounting flange defines a second clipping hole. The strengthening plate includes a first securing flange and a second securing flange. The first securing flange includes a first clamping portion. The second securing flange includes a second clamping portion. The strengthening plate is moveable in a first direction that is substantially perpendicular to the main body, to engage the first clamping in the first clipping hole; and the strengthening plate is rotatable about an axis, to engage the second clamping portion in the second clipping hole.

Abstract: Embodiments of the present application disclose a waveguide conversion device. The waveguide conversion device includes: a multi-layer circuit board; and a waveguide cavity and a metal reflection cavity, located at two lateral sides of the multi-layer circuit board. The waveguide cavity and the metal reflection cavity are embedded in the multi-layer circuit board. The multi-layer circuit board is disposed with a micro strip line or a strip line and a match patch connected to the micro strip line or the strip line. The match patch is located in the waveguide cavity.