JPH0516080B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite sensor that simultaneously measures the velocity and waviness of an object to be measured, such as a steel plate or paper.

Conventionally, for example, during the rolling process of a steel plate, the moving speed and waviness of the steel plate have been measured, and the speed measurement and waviness measurement have been performed using separate measuring instruments.

However, this requires a separate mounting space for each, and moreover, each type of equipment is also separate, so there is a problem in that a large space is required for measurement.

Furthermore, in speed measurement, the moving speed of the steel plate is measured by the rotational speed of the rolling roll.
In this case, if the rolling roll slips, an error will occur between the actual speed and the measured speed.
There was a problem that the reliability of the measured values was low.

This invention was made in view of these points,
The composite sensor of the present invention has a sensor head 5 which is provided facing the object to be measured 2 and is formed by bundling the ends of a plurality of light emitting fibers 3 and light receiving fibers 4.
, a photodetector 11 that receives light from the light-receiving fiber 4, a fundamental wave detection circuit 14, and frequency measurement circuits 15 and 16, and an object speed detection circuit 12 to which the output of the photodetector 11 is input. It has a distance detection circuit 13 which is composed of a peak detection circuit 17 and a peak value measurement circuit 18, and into which the output of the photodetector 11 is input, and which detects the moving speed of the object to be measured and the distance between the object to be measured and the sensor head. By measuring distance simultaneously, two types of measurements can be performed with one measuring device, thereby providing a composite sensor that can perform accurate measurements in a small space.

This description will be explained in detail below based on the embodiments shown in the drawings.

As shown in FIGS. 1 and 2, reference numeral 1 denotes a composite sensor that measures the moving speed and waviness of the steel plate 2 during the rolling process, and includes a plurality of light emitting fibers 3.
A sensor head 5 formed by bundling the ends of a light-receiving fiber 4 and a sensor head 5 is connected to a signal processing system 6.

The sensor head 5 is provided adjacent to the steel plate 2 at a certain distance α, and with its end face facing the steel plate 2. Further, the light emitting fibers 3 and 4 in the sensor head 5 are arranged regularly in the vertical and horizontal directions and are bound together in a rectangular shape by the outer sheath 7. Moreover, several fibers are each arranged in a row to form a plurality of fibers. The light emitting fiber row 3A and the light receiving fiber row 4A are arranged on the steel plate 2.
are arranged alternately in the direction of travel.

The light emitting fiber 3 is a fiber cable 3B.
A light source 8 is provided at the other end, and the light from this light source 8 is guided to the sensor head 5 and irradiated onto the steel plate 2. On the other hand, the light receiving fiber 4 is connected to the signal processing system 6 via a lens 9 and a light guide fiber 10 at the other end of the fiber cable 4B, and is irradiated by the light emitting fiber 3 and is connected to the steel plate 2. The reflected scattered light is received and sent to a signal processing system 6.

The signal processing system 6 includes a photodiode 11 that converts the scattered light into an electrical random signal, a speed detection circuit 12 that measures the speed V of the steel plate 2, and a distance detection circuit that measures the distance between the steel plate 2 and the sensor head 5. It is composed of 13.

The photodiode 11 is connected to the end of the ride guide fiber 10, and the speed detection circuit 12 is constructed by connecting the photodiode 11, a high-pass filter 14, a counter 15, and a speedometer 16 in series. This speed detection circuit 12 detects the frequency of the fundamental wave component of the signal received by the photodiode 11 via the light-receiving fiber 4 as the steel plate 2, which is a moving object, moves.
Focusing on the fact that it is proportional to the speed of the steel plate 2, the speed V of the steel plate 2 is measured from the frequency of the fundamental wave component of the random signal from the photodiode 11.

On the other hand, the distance detection circuit 13 includes a peak holder 17 and an intensity speed regulator 1 from the photodiode 11.
8. Distance meters 19 are connected in series in order. This distance detection circuit 13 focuses on the fact that the peak value of the fundamental wave of the signal received by the photodiode 11 is proportional to the distance between the steel plate 2, which is a moving object, and the end face of the light receiving fiber. The waviness of the steel plate 2 is measured by measuring the distance α from the peak amplitude value of the component, that is, the strength.

Next, the measurement operation will be explained. First, light emitted from the light source 8 is guided to the light projecting fiber 3 and is irradiated from the sensor head 5 onto the steel plate 2 moving during the rolling process.

This irradiated light is reflected by the steel plate 2, becomes scattered light, and enters the light receiving fiber 4. At this time, since the light emitting and light receiving fiber rows 3A and 4B are arranged alternately in the sensor head 5,
This sensor head 5 functions as a spatial filter and can provide a highly sensitive light receiving output. In other words, the movement of the steel plate 2 can be obtained as a sharp output.

Subsequently, the scattered light is amplified by the lens 9 from the light receiving fiber 4 and sent to the light guide fiber 10.
The signal is guided to the photodiode 11 and converted into a random signal. This random signal becomes an alternating signal of a fundamental wave component having a frequency proportional to the speed V of the steel plate in the high-pass filter 14, and this frequency is measured by the counter 15 and the speed V of the steel plate is measured.
is displayed on the speedometer 16.

On the other hand, in the random signal, the peak of the fundamental wave component is detected every cycle in the peak holder 17, and the amplitude value of this peak, that is, the intensity proportional to the distance α between the steel plate 2 and the sensor head 5 is measured by the intensity measuring device. 18 and displayed on the distance meter 19 to measure the waviness of the steel plate 2.

Note that the lens 9 and light guide fiber 10 in this embodiment are not necessarily provided.
The scattered light is transferred from the light receiving fiber 4 to the photodiode 1.
1 may be supplied directly.

Furthermore, although the arrangement structure of the fibers 3 and 4 of the sensor head 5 is not limited to that of the embodiment, a light emitting fiber row and a light receiving fiber row in which two or more fibers 3 and 4 are arranged in a row are used. In terms of sensitivity, it is preferable to alternately arrange them in various directions.

Further, although the above embodiment has been described with respect to the steel plate 2 undergoing a rolling process, it goes without saying that the present invention can be applied to objects to be measured such as steel plates and paper undergoing various processes.

As described above, according to the present invention, there is provided a sensor head that is provided facing an object to be measured and is formed by bundling the ends of a plurality of light emitting fibers and light receiving fibers, and a sensor head that is configured to combine the ends of a plurality of light emitting fibers and light receiving fibers, and to The photodetector consists of a photodetector, a fundamental wave detection circuit, and a frequency measurement circuit, and an object speed detection circuit into which the output of the photodetector is input, a peak detection circuit, and a peak value measurement circuit. It has a distance detection circuit that receives the output of Since it can be done at the same time, the installation space can be made smaller than before, and the number of parts can also be reduced.
The entire space can be small.

Furthermore, since the speed of an object is detected directly from the object, there is no error with the measured value, and highly reliable measurement can be performed.

Furthermore, since the sensor parts such as the sensor head all utilize light, the range of measurement applications can be expanded.

[Brief explanation of drawings]

The drawings show one embodiment of the invention,
Figure 1 is an enlarged perspective view of the sensor part of the composite sensor.
FIG. 2 is an overall schematic configuration diagram of the composite sensor. 1: Composite sensor, 2: Steel plate, 3: Light emitting fiber, 4: Light receiving fiber, 3A, 4A: Fiber row, 3B, 4B: Fiber cable, 5: Sensor head, 6: Signal processing system, 7: Outer cover , 8: light source,
9: Lens, 10: Light guide fiber, 1
2: Speed detection circuit, 13: Distance detection circuit, 14:
High pass filter, 15: Counter, 16: Speed meter, 17: Peak holder, 18: Intensity measuring device, 1
9: Distance meter.

Claims (1)

[Scope of Claims] 1. A sensor head that is provided facing the object to be measured and is formed by bundling the ends of a plurality of light emitting fibers and light receiving fibers, and a light detection device that receives light from the light receiving fibers. It consists of an object speed detection circuit, a peak detection circuit, and a peak value measurement circuit to which the output of the photodetector is input, and the output of the photodetector is What is claimed is: 1. A composite sensor comprising a distance detection circuit that receives an input, and simultaneously measures the moving speed of an object to be measured and the distance between the object to be measured and a sensor head. 2. The sensor head is characterized in that a plurality of light emitting fibers and a plurality of light receiving fibers are each arranged in a plurality of fiber rows, and the light emitting fiber rows and light receiving fiber rows are arranged alternately. A composite sensor according to claim 1.