JPH0493722A - Apparatus for detecting and measuring moving substance - Google Patents

Abstract

PURPOSE:To make it possible to measure the flow of powder and granular material and the like flowing through a pipe and the like accurately at the outer part without hindering a flow path by imparting a function which quantitatively measures the flow rate of a moving substance to the signal processing circuit of a measuring part. CONSTITUTION:A microwave detecting device A is attached to the outside of a pipe C wherein powder and granular material flows. The microwave which is generated in a microwave generator 2 is sent into the inside of the pipe C from a microwave transceiver 1. The microwave is reflected from the substance flowing in the pipe c and received with the transceiver 1. The signal is sent into a microwave receiving circuit 3 and received. The received signal is mixed in a mixer 4 and further transmitted into a signal processing and measuring device B. In the device B, at first, the amplified 5 signal is transmitted to a signal processing and measuring circuit 6. When the other conditions are made constant and the flow rate is increased, the received voltage is also increased. The change in this voltage is measured in the measuring circuit 6. The measured value of the flow rate is outputted from a measure d value output circuit 7. The change in frequency due to a Doppler effect is measured 6, and the measured value of the flow speed is outputted from the output circuit 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a convenient device that uses microwaves to accurately measure the flow of powder or granules flowing through a pipe or the like from the outside without obstructing the flow path.

In the past, there have been various types of flow detectors in pipes, such as the previous generation, movable plate type, propeller type, and capacitance type, all of which have had low stability and reliability, and have been difficult to maintain when used.

The present invention was developed as a result of research into a method that can measure the flow without any contact, with the aim of solving the conventional problems.The present invention is highly reliable, highly usable, and economically superior for moving objects. This is a measuring device.

First, the configuration and operation of a moving object detection and measurement device according to the present invention will be explained with reference to FIG.

A micro-skin detection device A attached to a conduit C that transports an object sends out microwaves toward the object moving in the conduit C, receives the reflected waves, and transmits the signal to a signal processing measurement device B. tell.

This signal is modulated as shown in FIG. 3 and contains information such as the amount, speed, material, size, etc. of the moving object.

The signal processing and measuring device B measures and outputs the amount, speed, material, size, moisture, adhesion inside the pipe, etc. of a moving object using a circuit that is adjusted according to the measurement purpose.

Next, a more detailed explanation will be given with reference to FIG. 2, a block diagram of a moving object detection and measurement apparatus according to the present invention.

As shown in Fig. 1, a microwave detection device A is attached to the outside of a pipe C through which powder and granules flow.
is sent inward.

On the other hand, the microwave is reflected by an object flowing in the pipe C, is received again by the microwave transmitter/receiver 1, and is sent to the microwave receiving circuit 3 and received.

The signals thus received are mixed by the mixer 4 and transmitted to the signal processing and measuring device B.

In the signal processing circuit device ff1B, first, the signal amplified by the amplifier circuit 5 is transmitted to the signal processing measurement circuit 6.

In the signal processing measurement circuit 6, the measurement is performed by adjusting the signal processing circuit according to each application, but first, the case of flow rate measurement will be explained.

In the modulated wave shown in FIG. 3, if the flow rate is increased while keeping other conditions constant, the received voltage will also increase.

This change in voltage is measured by the signal processing measurement circuit 6, and the measurement output circuit 7 outputs a measured value of the flow rate.

Next, the case of flow velocity measurement will be explained.

As shown in the modulated wave of FIG. 3, the change in frequency due to the Doppler effect is measured by the signal processing and measuring circuit 6, and the measurement output circuit 7 outputs a measured value of the flow velocity.

The Doppler effect is a phenomenon in which when an observer and a source of a sound wave or electromagnetic wave are in relative motion, the frequency of vibrations emitted by the source and the frequency received by the observer are different.

When a moving object approaches or departs (-ν) at a speed ν on a straight line connecting the signal transducer and the moving object, the frequency f of the signal reflected from the object and received is, where fo is The transmission frequency, ■ is the speed of the signal.

The Doppler shift frequency fd is the frequency of the relative difference between f and fo, and is expressed as follows. Therefore, if fo is constant, the velocity ν of the object can be determined by measuring fd.

Other uses include measuring the material, size, moisture content, and adhesion inside pipes of moving objects.

Next, these measurements will be explained.

In Figure 3, if the material is changed while keeping other conditions constant,
The voltage varies depending on the characteristics of each.

Furthermore, if the particle size is increased while holding other conditions constant, the voltage will also increase.

Also, if the moisture content of an object increases, keeping other conditions constant, the voltage will also increase.

Also, holding other conditions constant, as the amount of adhesion inside the tube increases, the voltage decreases.

All of these measurements can be detected as changes in voltage, and by providing appropriate characteristics to each in the signal processing and measuring circuit 6, the device functions as a measuring device suitable for the purpose.

FIG. 4 shows an example of the measurement results.

Furthermore, if the device is equipped with a plurality of processing circuits, each of which is adjusted for a different purpose, as the signal processing and measuring circuit 6, a single detection device can measure a plurality of different phenomena at the same time, allowing for versatile monitoring and control. becomes.

As described above, the present invention does not obstruct the pipe line, is stable for a long time because there are no moving parts, is resistant to dirt, can perform various measurements with one detector, is easy to maintain, and is economical. We are confident that the use of the present invention will enable more advanced analysis and control in pneumatic conveyance equipment for powder and granular materials, and will be of great help to the future development of industry. be.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a moving object detection and measurement device according to the present invention. FIG. 2 is a block diagram of a moving object detection and measurement device according to the present invention. FIG. 3 shows a received waveform modulated by the speed and amount of a moving object. Figure 4 shows data when the signal processing circuit is changed according to the application (A-B-C in Figure 4 represent differences in materials.) <Explanation of symbols> ■ Microwave transceiver - Microwave generator 3, microwave receiving circuit mixer amplifier circuit signal processing measurement circuit measurement output circuit microwave detection device signal processing measurement device conduit signal processing measurement circuit 6 and measurement output circuit 7 or more. Patent Applicant No. 27 Representative Director Katsumi Nakano

Claims (7)

[Claims] (1) A microwave generator, a transmitter/receiver for transmitting and receiving the microwave into space, and a receiver for receiving the transmitted microwave and its reflected components. Consists of a mixer that obtains the output of the product/sum of received microwaves, a signal amplification circuit, a signal processing circuit for calculations, averaging, smoothing, etc., a signal output circuit, and a power supply circuit. A configuration in which a microwave detection and measurement section is attached to the outside of the pipe wall of a pipe through which a moving object flows, characterized in that the signal processing circuit of the measurement section is given a function to quantitatively measure the flow rate of the moving object. A moving object detection measurement device. (2) A moving object detection and measurement device configured as described in item (1) above, characterized in that the signal processing circuit of the measurement section is provided with a function of quantitatively measuring the flow velocity of the moving object. (3) A moving object detection and measurement device configured as described in item (1) above, characterized in that the signal processing circuit of the measurement section is provided with a function of quantitatively measuring differences in the materials of the moving object. . (4) A moving object detection and measurement device configured as described in item (1) above, characterized in that the signal processing circuit of the measurement section is provided with a function of quantitatively measuring the dimensions and shape of the moving object. . (5) In the configuration described in item (1) above, the signal processing circuit of the measurement unit is provided with a function of quantitatively measuring the content of liquid such as moisture contained in a moving object. Moving object detection measurement device. (6) In the configuration described in item (1) above, the movement is characterized in that the signal processing circuit of the measurement unit is provided with a function of quantitatively measuring the amount of the moving object attached to the inner wall of the pipe. Object detection measurement device. (7) In the configuration described in item (1) above, the signal processing circuit of the measuring section is configured to perform two of the functions described in items (1) to (6) above (flow velocity and other functions). (paragraph 1)
1. A moving object detection and measurement device having a function of generating separate output signals.