JPS58132896A - Conpound sensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 instruments.

However, this requires separate installation space for each, and each type of equipment is also separate, so #
There was a problem in that it required a large amount of space for measurement.

Historically, in speed measurement, the moving speed of the steel plate was measured using the rotational speed of the rolling rolls, but if the rolling rolls slipped, an error would occur between the actual speed and the measured speed. However, there was a problem in that the reliability of measurement i+ti was low.

This invention has been made in view of the above, and includes a sensor head in which a plurality of light emitting and light receiving fibers are bundled together on a measured object, and this sensor head is connected to a speed detection circuit and a distance detection circuit. connected to a signal processing system with
By measuring the moving speed of the object and the distance between the object and the sensor head from the frequency and peak amplitude value of the fundamental wave component in the random signal of the scattered light reflected by the object,
The present invention provides a composite sensor that performs two types of measurements with a single measuring instrument, allowing accurate measurements to be made in a small space.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

As shown in FIGS. 1 and 2, ] is a composite sensor that measures the moving speed and waviness of a steel plate 2 during the rolling process, and the end portions of a plurality of light emitting fibers 3 and light receiving fibers 4 are A bundled sensor head 5 is connected to a signal processing system 6.

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

A light source 8 is provided at the other end of the fiber cable 3B of the light projecting fiber 3, and the light from the 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 0 at the other end of the fiber cable 4B, and is irradiated by the light-emitting fiber 3 and 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 2 that measures the speed V of the steel plate 2, and a distance that measures the distance between the steel plate 2 and the sensor bend 5. It is composed of a detection circuit 13.

The photodiode 11 is connected to the ride guide fiber 1.
0 end, the speed detection circuit 7217 is connected to the photodiode 11 and bypass filter 14° counter 15. Speed meters 16 are connected in series, and 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
From 1, peak holder 17, strength measuring device 18, distance meter 19
are connected in series in order to measure the peak amplitude value of the fundamental wave component of the random signal, that is, the intensity and the distance α to measure the waviness of the steel plate 2.

Next, the measurement operation will be explained. First, the light emitted from the light source 8 is guided by the light emitting fiber 3 and irradiated through the sensor head 5 onto the plate 2 that moves 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, in the sensor head 5, since the light emitting and light receiving fiber rows 3A and 4B are arranged alternately, the sensor head 5 acts as a spatial filter and can obtain 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 light-receiving fiber 4 and the lens 9, guided to the light guide fiber 10, and supplied to the photodiode 11, where it is converted into a random signal. This random signal becomes an alternating signal of a fundamental wave component having a frequency proportional to the steel plate speed V in the bypass filter 14, and this frequency is measured by the counter 15 and the steel plate speed V is displayed on the speedometer 16.

On the other hand, in the random signal, the peak of the fundamental wave component for each cycle is detected by the peak holder 17, and the amplitude value of this peak is then detected by the steel plate 2 and the sensor head.
The strength proportional to the distance d between the two is measured by the strength measuring device 18 and displayed on the distance meter 19, and the waviness of the steel plate 2 is measured.

It should be noted that the lens 9 and light guide fiber 10 in this embodiment are not necessarily provided, and the scattered light may be directly supplied to the photodiode from the light receiving fiber 4.

Further, the arrangement structure of each fiber 3, 4 of the sensor head 5 is not limited to that of the embodiment, but each fiber 3, 4 is
Intersect the light emitting fiber array and the light receiving fiber array arranged in multiple rows in various directions! From the viewpoint of sensitivity, it is preferable to arrange it at j.

Furthermore, 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, a sensor head in which a plurality of light emitting and light receiving fibers are bundled is attached to an object to be measured.
This sensor head is connected to a signal processing system having a speed detection circuit and a distance detection circuit, and the movement of the object is determined based on the frequency and peak amplitude value of the fundamental wave component in the random signal of the scattered light reflected by the object. By measuring the speed and the distance between the object and the sensor head, two types of measurements can be performed simultaneously with one measuring device, so the installation space can be reduced compared to conventional methods. Moreover, since the number of parts can be reduced, the overall space can be reduced.

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

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

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an enlarged perspective view of a sensor portion of a composite sensor, and FIG. 2 is a schematic diagram of the overall configuration of the composite sensor. 1: Composite sensor, 2: Steel plate 3: Light emitting fiber, 4: Light receiving fiber, 3A/4A: Fiber row, 313-413: Fiber cable, 5: Sensor head, 6: Signal processing system, 7: Outer cover , 8: Light source, 9:
Lens, ]0nilight guide fiber, 12: Speed detection circuit, 13: Distance detection circuit, 14: Bypass filter, 15: Counter, ]6: Speedometer, 17
;Peak holder, ]8: Intensity measuring device, 19; Distance meter. Patent applicant Shimadzu Corporation Representative Patent attorney Shigenobu Nakamura

Claims (1)

[Claims] (]) A sensor head formed by bundling the ends of a plurality of light-emitting fibers and light-receiving fibers is provided facing the object to be measured, and this sensor head connects the light-receiving fibers together. The signal processing system is connected to a signal processing system via the object, and this signal processing system includes a speed detection circuit of the object and a distance detection circuit between the sensor head and the object, and detects a random signal of scattered light reflected by the object. The speed detection circuit measures the moving speed of the 111 object based on the frequency of the A water wave component of this random signal, while the distance detection circuit measures the distance between +tiJ object and the sensor head based on the peak amplitude value of the fundamental wave component. A composite sensor that measures the distance between. (2) +ftf The sensor head is configured by configuring a plurality of light emitting fibers and light receiving fibers into a plurality of fiber rows, and these light emitting fiber rows and light receiving fiber rows are arranged alternately. A composite sensor according to claim 1, characterized in that: