A compound sensor that is capable of being used with robotics is provided such that the compound sensor includes a distance measurement unit and a pressure measurement unit. Further, a contact detection unit, which is dedicated to performing a detection when a measurement target contacts with a surface of the sensor is included.

A compound sensor that is capable of being used with robotics is provided such that the compound sensor includes a distance measurement unit and a pressure measurement unit. Further, a contact detection unit, which is dedicated to performing a detection when a measurement target contacts with a surface of the sensor is included.

The present invention discloses a ultrasonic method for indirectly measuring a pressure of a cavity of an injection molding machine, comprising: emitting ultrasonic wave to each pull rod along an axial direction of the pull rod respectively at the same time, detecting an ultrasonic wave echo time difference of each pull rod, and obtaining an average pressure inside a cavity of the injection molding machine. By the detection method and detection device of the present invention, the pressure inside the cavity may be detected in a certain state, the pressure inside the cavity in the injection molding process may be detected in real time, and the detection process is simple and the accuracy is high.

The present invention discloses a ultrasonic method for indirectly measuring a pressure of a cavity of an injection molding machine, comprising: emitting ultrasonic wave to each pull rod along an axial direction of the pull rod respectively at the same time, detecting an ultrasonic wave echo time difference of each pull rod, and obtaining an average pressure inside a cavity of the injection molding machine. By the detection method and detection device of the present invention, the pressure inside the cavity may be detected in a certain state, the pressure inside the cavity in the injection molding process may be detected in real time, and the detection process is simple and the accuracy is high.

The present invention provides an arteriovenous pressure measurement device which allows noninvasive and accurate measurement of arteriovenous pressure, and also provides an arteriovenous pressure measurement method using the measurement device. The noninvasive arteriovenous pressure measurement device comprises a probe (20) for radiating ultrasound toward a blood vessel in the skin, a pressing part (10) for pressing the skin in a state of being placed between the skin and the probe (20), and a pressure sensor (33) for detecting a pressing force applied to the skin at the pressing part (10), the pressing part (10) having water (36) permeable to the ultrasound and a balloon (31) accommodating the water (36), the flexible container (31) being made of a flexible material permeable to the ultrasound, and an outer surface of the balloon (31) presses the skin.

The present invention provides an arteriovenous pressure measurement device which allows noninvasive and accurate measurement of arteriovenous pressure, and also provides an arteriovenous pressure measurement method using the measurement device. The noninvasive arteriovenous pressure measurement device comprises a probe (20) for radiating ultrasound toward a blood vessel in the skin, a pressing part (10) for pressing the skin in a state of being placed between the skin and the probe (20), and a pressure sensor (33) for detecting a pressing force applied to the skin at the pressing part (10), the pressing part (10) having water (36) permeable to the ultrasound and a balloon (31) accommodating the water (36), the flexible container (31) being made of a flexible material permeable to the ultrasound, and an outer surface of the balloon (31) presses the skin.

An active mechanical waveguide including an ultrasonically-transmissive material and a plurality of reflection points defined along a length of the waveguide may be driven at multiple resonant frequencies to sense environmental conditions, e.g., using tracking of a phase derivative. In addition, frequency-dependent reflectors may be incorporated into an active mechanical waveguide, and a drive frequency may be selected to render the frequency-dependent reflectors substantially transparent.

An active mechanical waveguide including an ultrasonically-transmissive material and a plurality of reflection points defined along a length of the waveguide may be driven at multiple resonant frequencies to sense environmental conditions, e.g., using tracking of a phase derivative. In addition, frequency-dependent reflectors may be incorporated into an active mechanical waveguide, and a drive frequency may be selected to render the frequency-dependent reflectors substantially transparent.

An environmental condition may be measured with a sensor (10) including a wire (20) having an ultrasonic signal transmission characteristic that varies in response to the environmental condition by sensing ultrasonic energy propagated through the wire using multiple types of propagation, and separating an effect of temperature on the wire from an effect of strain on the wire using the sensed ultrasonic energy propagated through the wire using the multiple types of propagation. A positive feedback loop may be used to excite the wire such that strain in the wire is based upon a sensed resonant frequency, while a square wave with a controlled duty cycle may be used to excite the wire at multiple excitation frequencies. A phase matched cone (200, 210) may be used to couple ultrasonic energy between a waveguide wire (202, 212) and a transducer (204, 214).

An environmental condition may be measured with a sensor (10) including a wire (20) having an ultrasonic signal transmission characteristic that varies in response to the environmental condition by sensing ultrasonic energy propagated through the wire using multiple types of propagation, and separating an effect of temperature on the wire from an effect of strain on the wire using the sensed ultrasonic energy propagated through the wire using the multiple types of propagation. A positive feedback loop may be used to excite the wire such that strain in the wire is based upon a sensed resonant frequency, while a square wave with a controlled duty cycle may be used to excite the wire at multiple excitation frequencies. A phase matched cone (200, 210) may be used to couple ultrasonic energy between a waveguide wire (202, 212) and a transducer (204, 214).