Device and method for measuring gas pressure by using ultrasonic wave

The invention provides a device for measuring gas pressure by using ultrasonic wave. The device comprises a sonic apparatus, a wire, a controlling and processing device and a display, wherein the sonic apparatus comprises a shell, a closing cover, an upper coal clamping plate, a lower coal clamping plate, a sonic emitter, a standard test coal pillar and a sonic receiver; one end of the shell is closed, and the other end of the shell is open; the opening is sealed by using the sealing cover; the standard test coal pillar is placed in the middle of the shell; one end of the standard test coal pillar is clamped by using the lower coal clamping plate, and the other end of the standard test coal pillar is clamped by using the upper coal clamping plate; the lower coal clamping plate is provided with the sonic emitter; one end of the sonic emitter is in contact with the standard test coal pillar, and the other end of the sonic emitter is connected with the controlling and processing device through the wire; the upper coal clamping plate is provided with the sonic receiver; one end of the sonic receiver is in contact with the standard test coal pillar, and the other end of the sonic receiver is connected with the controlling and processing device through the wire. The device provided by the invention has the advantages of accuracy in measurement, convenience in operation, time saving effect, labor saving effect and the like. The invention also provides a method for measuring the gas pressure by using the device.