JPS6081794A - Method of detecting discharge at microwave applying time - 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 discharge detection method for quickly detecting a discharge phenomenon in a waveform.

When transmitting ``1 microphone wave'' with 1 % output using a 9-wave tube and using it for industrial purposes such as heating, damage in the air 1-1
+F11 The presence of evaporated matter from hot objects or substances such as carbon may sometimes absorb microphone waves, resulting in intense heat generation, which in turn can lead to gas discharges. Straw, the discharge phenomenon is due to the ionization effect of gas,
1. This is an ionization phenomenon of gas, which is accompanied by the generation of a plasma flame, which generates J and C discharges. Not only is it absorbed and the material to be treated cannot be heated,
The plasma flame will damage the wave tube or heater. In addition, once the discharge state has occurred, the microphone [
It will last unless the J-wave is blocked or covered, or the plasma flame is cooled. Therefore, it is necessary to detect the occurrence of discharge at ii'i +5 and to avoid erasing .

This invention is based on 4. Y: It was developed to solve the problem of rice, and provides the lj method that can quickly and reliably detect the occurrence of electric discharge.

However, this emission is caused by a sharp change in the reflected wave intensity generated within the transmitter based on the discharge Φ by detecting the inverse wave of the microwave from the microphone [1 wave application part]. is compared with m ttt m determined under the normal microwave reflection state, and the increase time of the foul wave suspension is ll! [! There is a system that detects a discharge phenomenon when there is a problem with the system.

Hereinafter, this embodiment of the bookmark will be explained with reference to the drawings.

In FIG. 1, a microwave oscillator 1 applies one wave from a microphone to a seven-wave heating furnace (not shown) through a waveguide 2. Waveguide! 2 consists of an incident wave detector 4 that detects the incident wave applied to the microwave/III thermal furnace, and a reflected wave detector 5 that detects the reflected wave that is reflected back from the microwave heating furnace. A directional coupler 3 is provided. The incident wave detector 4 and the reflected wave detector 51.1 are connected to the power 1-niku 6. This power [The Niku 6 is equipped with a display meter 7°8 that displays each intensity of the incident wave and reflected wave.In order to perform appropriate heating operations, normally the input θ and j waves are Intensity 1. According to α (the intensity of the foul wave is the minimum), sea urchin, mari [] Immerse in the wave oil heating matching machine J3 and the waveguide method 11, set the matching amount r, pa,
Matching is performed so that the maximum usable wave can be obtained.1 Furthermore, the power detector 6 is connected to a reflected wave level transmission detector 5), and detection by the reflected wave detector 5 (g has been denounced.

When electric discharge occurs in the microwave heating furnace, the intensity of the reflected wave increases within a short R period. In other words, under normal conditions, the reflected wave level changes gradually, as shown in (Δ), but when a discharge occurs, the reflected wave intensity suddenly changes as shown in (B). change to cover. In step 1, the level gradient is checked in advance under the condition of this time change, and when the discharge occurs (
Set a reference value for the rise time of the reflected wave as appropriate, using a time longer than the rise time of the reflected wave that is input to the reflected wave. Compare the changes in rise time.

The reflected wave level signal detector is connected to the microphone [1-wave oscillator 1, and the time change of the strong wave F of the foul wave, 1, that is, the level gradient B M n', 1 Ift , J, (')
If you are a person! Iku ``L wave 5 and shaker 1 no! 1.';''J(! Imuji.

The lgnet control circuit 1'1 is operated through the high J soil relay 10:0 I! The oscillation of the microphone 1-1 wave is stopped during (, -=constant 0,).

Such an operation can be carried out by, for example, a device such as shown in FIG. 33. In the figure, the reflected wave power detected by the C1 direction bamboo coupler 3 is input to the display section of the power meter 6 and shown on the display meter 8. , - force is amplified by Jj to the amplifier 9o of the detector 9 to the reflected wave level at the rimbling period fυ;
is applied to the discharge detector 5] (processing 8 1°1, that is, the first sampling room 1△ of STETSUNO '92t' is 2 at the strip 94 which has been delayed for a predetermined time with the screen f9:3). times[
1 limp ring 1m L Differential with B 1i (+V
To make a request, measure the reference value Vc of the normal counterwave in advance with the strip 98 (and compare these with the strip 96'C).
If V is small, it is determined in step 99-C that a discharge has occurred. In addition, differential! tI V CL Figure 2 (13)
tn Δ and Jj, reflected wave intensity LA at mouth 3
and L [3 and FJ claim! i! 'Pfi6 Vc+
,B/+21￥I(Δn's jj, (△ and j,',j l
'ldo lj tB IJ le anti nJ Reveal the wave intensity In. 1 h3 in the microwave melting furnace! Electricity is light! 1! When J, the above differential 4fiV increases rapidly'jLyJ'ull'
1iUVc work, judgment of discharge occurrence is <'U (expansion')
(1) This 1' signal is sent to the high-voltage relay 10 at a time approaching state and stop the discharge tl-r:Set++ / Boden is 1';'
IL! 1 drink (white is >14.tll lIJ,
This is detected by the stripe 9゛IC“.
C The high voltage relay 10 is moved after a predetermined period of time (μC
Turn the control circuit 11 to A and turn off the microwave oven opening 1 again by 1tfl.

As explained above, the rise of the microwave anti-sword wave due to the discharge generated in the 11-wave application section.
The occurrence of electrical discharge can be detected by comparing the rising time of the anti-Q wave during normal operation. The key is to detect it quickly and reliably.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing -IA of both i+ff to which this invention is applied, and Fig. 2 (Δ), (1,'3) 4.1('
(Reflected wave level 1 when normal and when reflected waves occur)
Figures 1 and 3 are circuit diagrams of the discharge detector.

Claims (1)

[Claims] 1. Use a microphone to detect the reflected wave of the microwave from the 1-wave application part, and detect the rapid change in the reflected wave intensity that occurs within a short period of time based on the discharge current. Compared to base 11'L 1ift, increase in anti-sword wave suspension +1 &
9 for discharging when λ0 is smaller than 1-2 units fit Ill'i! How to detect discharge when microwave is applied is characterized by r2<.