Abstract: To provide a clamp-on type ultrasonic flow sensor capable of preventing deterioration in measurement accuracy of a flow rate due to deformation of a pipe. Elastic couplants CP1 and CP2 formed to surround the outer circumferential surface of a pipe are fixed while being pressed on the pipe P by fixing inner surfaces FS of two clamp members 131 and 132. An ultrasonic wave is propagated through the elastic couplants CP1 and CP2 and fluid in the pipe between a first ultrasonic element 101 and a second ultrasonic element 102. A cross section of the fixing inner surfaces FS of the clamp members 131 and 132 has a shape of a regular even-numbered polygonal shape centering on the axis of the pipe.

Abstract: To provide a clamp-on type ultrasonic flow sensor capable of highly accurately measuring a flow rate. First and second head cables CA1 and CA2 are connected between a head section 10 and an intermediate section 20. A relay cable CA3 is connected between the intermediate section 20 and a main body section 30. Ultrasonic elements are housed in casings 11c and 12c of the head section 10. A driving circuit for driving the ultrasonic elements and a signal processing section configured to perform signal processing on ultrasonic signals output from the ultrasonic elements are housed in a casing 20c of the intermediate section 20. In the intermediate section 20, a switching circuit configured to switch a connection state of the two ultrasonic elements of the head section 10 and the signal processing section is provided.

Abstract: To provide a clamp-on type ultrasonic flow sensor capable of highly accurately measuring a flow rate. First and second head cables CA1 and CA2 are connected between a head section 10 and an intermediate section 20. A relay cable CA3 is connected between the intermediate section 20 and a main body section 30. Ultrasonic elements are housed in casings 11c and 12c of the head section 10. A driving circuit for driving the ultrasonic elements and a signal processing section configured to perform signal processing on ultrasonic signals output from the ultrasonic elements are housed in a casing 20c of the intermediate section 20. In the intermediate section 20, a switching circuit configured to switch a connection state of the two ultrasonic elements of the head section 10 and the signal processing section is provided.

Abstract: To provide a clamp-on type ultrasonic flow sensor capable of preventing deterioration in measurement accuracy of a flow rate due to deformation of a pipe. Elastic couplants CP1 and CP2 formed to surround the outer circumferential surface of a pipe are fixed while being pressed on the pipe P by fixing inner surfaces FS of two clamp members 131 and 132. An ultrasonic wave is propagated through the elastic couplants CP1 and CP2 and fluid in the pipe between a first ultrasonic element 101 and a second ultrasonic element 102. A cross section of the fixing inner surfaces FS of the clamp members 131 and 132 has a shape of a regular even-numbered polygonal shape centering on the axis of the pipe.

Abstract: There is provided a photoelectric switch capable of accurately detecting even such a workpiece where a tint changes within the same workpiece, while preventing erroneous detection. The photoelectric switch includes: a light projecting unit; a light receiving unit; a coincidence degree calculating unit for comparing the acquired color information with a reference color to calculate a coincidence degree of both of the color information. When the color information is newly acquired, a detection signal generating unit compares, with a detection determination threshold, the highest coincidence degree of coincidence degrees calculated by respectively comparing the color information newly acquired, with the two or more reference colors, to perform workpiece determination.

Abstract: There is provided a photoelectric switch capable of reducing a size of a whole device while suppressing light amount irregularity and color irregularity of detected light. The photoelectric switch includes: a surface mount LED, configured to generate a light containing a plurality of color components with different hues; an optical shield disposed between the surface mount LED and a light projecting lens to shield the light around an optical opening passing the light from the surface mount LED to the light projecting lens; a light receiving element configured to selectively receive the light to generate a plurality of light reception signals; a controller configured to control a light projecting amount of the surface mount LED based on the light reception signal.

Abstract: There is provided a photoelectric switch capable of reducing a size of a whole device while suppressing light amount irregularity and color irregularity of detected light. The photoelectric switch includes: a surface mount LED, configured to generate a light containing a plurality of color components with different hues; an optical shield disposed between the surface mount LED and a light projecting lens to shield the light around an optical opening passing the light from the surface mount LED to the light projecting lens; a light receiving element configured to selectively receive the light to generate a plurality of light reception signals; a controller configured to control a light projecting amount of the surface mount LED based on the light reception signal.

Abstract: There is provided a photoelectric switch capable of accurately detecting even such a workpiece where a tint changes within the same workpiece, while preventing erroneous detection. The photoelectric switch includes: a light projecting unit; a light receiving unit; a coincidence degree calculating unit for comparing the acquired color information with a reference color to calculate a coincidence degree of both of the color information. When the color information is newly acquired, a detection signal generating unit compares, with a detection determination threshold, the highest coincidence degree of coincidence degrees calculated by respectively comparing the color information newly acquired, with the two or more reference colors, to perform workpiece determination.

Abstract: A concave curved surface 95 is formed on a light inputting surface 93 of a light emitting lens 43, and a convex curved surface 96 is formed on a light emitting surface 94. Only laser light close to an optic axis A is inputted to the concave curved surface 95, and a spread angle is enlarged, and thereby, it is possible to make intensity distribution more uniform, and to reduce an error on the occasion of comparing a received light amount of reflected light with a threshold value, and therefore, even if a light receiving surface is small, it is possible to detect an object with high accuracy.

Abstract: A projection head of a photoelectric sensor includes a first monitoring light receiving device for receiving a part of a light that the light projecting device emits, and a projected light quantity controlling device for executing a control such that a first monitor signal obtained by the first monitoring light receiving device is kept constant to maintain a quantity of projected light of the light projecting device at a predetermined value. Also, a controlling portion of a controller senses an abnormality of the projection head based on a monitor signal obtained from the first monitoring light receiving device to be monitored via the head cable, and suppress a light projected from the light projecting device. The separate type photoelectric switch, in which the projection head is separated from the controller, is constructed such that the abnormality of the projection head can be monitored on the controller side.

Abstract: A concave curved surface 95 is formed on a light inputting surface 93 of a light emitting lens 43, and a convex curved surface 96 is formed on a light emitting surface 94. Only laser light close to an optic axis A is inputted to the concave curved surface 95, and a spread angle is enlarged, and thereby, it is possible to make intensity distribution more uniform, and to reduce an error on the occasion of comparing a received light amount of reflected light with a threshold value, and therefore, even if a light receiving surface is small, it is possible to detect an object with high accuracy.

Abstract: A projection head of a photoelectric sensor includes a first monitoring light receiving device for receiving a part of a light that the light projecting device emits, and a projected light quantity controlling device for executing a control such that a first monitor signal obtained by the first monitoring light receiving device is kept constant to maintain a quantity of projected light of the light projecting device at a predetermined value. Also, a controlling portion of a controller senses an abnormality of the projection head based on a monitor signal obtained from the first monitoring light receiving device to be monitored via the head cable, and suppress a light projected from the light projecting device. The separate type photoelectric switch, in which the projection head is separated from the controller, is constructed such that the abnormality of the projection head can be monitored on the controller side.

Abstract: Light emitted from light-projecting elements constituted by LEDs (light-emitting diodes) or the like is transmitted to a light-projecting optical system of a sensor head portion through an optical fiber cable and projected from the light-projecting optical system onto an object. The light projected onto the object is reflected on the object. The reflected light is made incident on a light-receiving optical system. The light incident on the light-receiving optical system is led to a light-receiving element. The light-receiving element detects the incident light and generates a light-receiving signal based on the quantity of the detected light. The light-receiving signal generated by the light-receiving element is transmitted to a signal processing control portion of a main body portion through a light-receiving circuit and an electric wire cable.

Abstract: Light emitted from light-projecting elements constituted by LEDs (light-emitting diodes) or the like is transmitted to a light-projecting optical system of a sensor head portion through an optical fiber cable and projected from the light-projecting optical system onto an object. The light projected onto the object is reflected on the object. The reflected light is made incident on a light-receiving optical system. The light incident on the light-receiving optical system is led to a light-receiving element. The light-receiving element detects the incident light and generates a light-receiving signal based on the quantity of the detected light. The light-receiving signal generated by the light-receiving element is transmitted to a signal processing control portion of a main body portion through a light-receiving circuit and an electric wire cable.