JPS5923375B2 - Fluid property determination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for determining the condition of treated water in water treatment using activated sludge, electro-processing fluid treatment, etc., and also for determining the properties of fluids such as exhaust gas.

When over-aeration is carried out in a biological treatment tank, the activated sludge becomes finer and the pH decreases due to nitrogen oxidation (all 3 pages), and phenomena such as settling sludge being thrown up occur, which is a side effect of normal operation.

Furthermore, when filamentous fungi multiply, the activated sludge does not settle and a bulking phenomenon occurs. To prevent this kind of abnormality, increase the amount of aeration when applying chemicals. When there is very little activated sludge,
Or, generally when the load becomes high, a BOD source with a reduced amount of air is turned on. In such biological treatment, it is necessary to constantly monitor and control the condition, activity state, etc. of the organisms. For this purpose, we have provided the following fluid property determination device. That is, there is a pipe through which the fluid of the object such as treated water or gas flows, a detection part is provided in a part of the pipe, a laser irradiation device is provided on one side, and a detector is provided on the other side, and the detection signal of the detector is provided. The device is equipped with a device that determines the However, by continuously flowing the fluid of the subject for a long period of time, the wall surface of the pipe forming the flow path is contaminated with sludge and the like, which reduces the accuracy of detection and discrimination.

The present invention improves this point by including a control device for increasing and controlling the irradiation laser as the laser irradiation device, and purifying the detection portion wall surface of the pipe by irradiating the increased laser beam to the wall surface of the detection portion of the pipe when it becomes contaminated. be. The present invention will be explained below with reference to an embodiment of the drawings. 1 is a pipe for sampling and distributing treated water from a treatment tank using activated sludge, etc.; 2 is a detection section with a narrowed pipe diameter; and 2 is a member having translucency. It is made up of.

3 is a laser irradiation device, which emits sand and output laser beams 4 from an oscillator such as a solid-state laser or gas laser to a detection unit 2.
irradiate.

Reference numeral 5 denotes a lens that focuses the beam so that the beam is focused approximately at the center of the detection pipe 2.

Reference numeral 6 denotes a driving motor ' which controls the movement of the lens in the direction of the beam axis to control the focal position, and T is a control circuit which applies a movement signal to the motor 6.

8 is a detector for detecting reflected, scattered, or transmitted light; 9 is an amplifier for the detection signal; 10 is a discrimination circuit; and 11 is an output display circuit.

In the above-described apparatus, the water of the subject is made to flow through the pipe 1 by a pump (not shown).

Water flows through a detection section 2 made of a translucent material, and is irradiated with a laser by an irradiation device 3. The lens 5 irradiates the laser beam so as to focus it on the central portion of the detection section 2 . The irradiated light hits the microorganisms in the water and is reflected, scattered, and transmitted. These reflected and scattered lights and transmitted lights show different values depending on the amount and type of microorganisms, and the transmitted light is different depending on the amount and type of microorganisms. Then, the reflected and scattered light can be collected and detected by the lens, and the reflected and scattered light outside the optical axis can be cut out and only the transmitted light can be detected, and the detector 8 performs photoelectric conversion and outputs an electrical signal. do. After the signal is amplified by an amplifier 9, it is discriminated by a discrimination circuit 10. Discrimination is done by determining the level of reflected and scattered light, the level of transmitted light, comparing and determining the scattered light and transmitted light, and also by comparing graphs using X, Y recorders, etc., to determine the organisms in the water and the activated sludge state. . Furthermore, more detailed discrimination can be made by detecting the angular distribution of the scattered light while changing the detection angle and moving the discrimination blade 1. While such detection/judgment continues, underwater microorganisms, sludge, etc. adhere to the inner wall surface of the detection section 2, and the amount of adhesion gradually increases.

Although the detection part 2 is made of light-transmitting material, the attached proboscis obstructs the irradiated laser beam, and this wall surface causes reflection and scattering, making it difficult to accurately detect and discriminate the underwater microorganisms, etc. to disturb. Therefore, when the above-mentioned adhered substances come to influence the detection by continuing detection and discrimination while flowing the sample fluid through the pipe 1, or when the above-mentioned adhered substances are caused to flow at a constant flow rate, the amount of adhered substances increases proportionally over time. Since the wall surface contamination can be determined in terms of time, the wall surface is cleaned to remove deposits at predetermined time intervals of a. During this purification, a signal is applied from the control circuit 7 to the motor 6 to move the lens 5 in the direction of the arrow. That is, during detection so far, the focus of the light has been adjusted to be at the center of the detection section 2, but during purification, the lens 5 is moved back and forth to bring the focus to the inner wall surface of the detection section 2. Figure 2 is an enlarged detailed assembly diagram. When the lens 5 is advanced a required distance toward the detection section 2, the laser beam is focused on the wall in front of the detection section 2, and when it is moved backward, the laser beam is focused on the inner wall in front. can be focused.

The energy of this focused portion increases rapidly and is heated to a high temperature, thereby decomposing and vaporizing the deposits on the wall and purifying it. Therefore, by moving the lens 5 by reciprocating a predetermined distance of the motor 6, the focal point of the laser can be purified while moving between the front wall and the near wall. Of course, by deflecting the laser irradiation axis, the purifying effect can be exerted over a large area of the wall surface of the detection section. In addition, in the illustrated embodiment, the control circuit 7 simultaneously moves the focal point during purification.
The power of the laser irradiation device 3 is multiplied by a signal from the laser irradiation device, and switching control is performed so that the intensity of the output beam is increased, thereby increasing the purification effect.

Of course, if the inner diameter of the detection section 2 is small, it is sufficient to simply control the output of the irradiation device 3 to increase or decrease without controlling the movement of the focal point of the laser beam. After cleaning the wall surface of the detecting section as described above, the lens 5 is returned to the predetermined position and the focal point is positioned at the center of the detecting section 2, so that fluid detection and discrimination can be performed.

At this time, the drive motor is stopped, and stable laser irradiation allows accurate detection and discrimination. And detection part 2
If it becomes contaminated, the motor 6 is driven again to perform a purifying action, but the contamination state is determined by the decrease in the detection signal from the detector 8, and when the level has decreased to a certain level, the cleaning time is determined and the control circuit 7 is activated. and the detection signal exceeds a certain level by purification. If the control circuit 7 is stopped when the temperature is reached, the purification work can be performed automatically (by automatic control). As described above, in the present invention, since the property of the fluid is determined by laser irradiation and detection while cleaning the detection part wall surface, highly accurate detection and determination can be performed.

Since the purification work utilizes an irradiation laser without providing any special equipment, the purification performance is high and the structure of the apparatus is simplified. Furthermore, the present invention can also be applied to property determination in the treatment process of electrical machining fluid, exhaust gas determination, and the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a partially enlarged view thereof. 1 is a pipe, 2 is a detection unit, 3 is a laser irradiation device, 4 is a laser beam, 5 is a lens, 6 is a motor, 7 is a control circuit, 8 is a detector, 9 is an amplifier, 10 is a discrimination circuit, 11 is a display circuit.

Claims (1)

[Claims] 1. A pipe through which a fluid of a subject flows, a detection section is provided in a part of the pipe, a laser irradiation device is provided on one side, and a detector is provided on the other side, and a detection signal of the detector is provided. The apparatus is equipped with a control device for controlling the increase in the irradiation laser as the laser irradiation device, and in the event of contamination, the wall surface of the detection part of the pipe is irradiated with the laser in a controlled increase to purify it. A fluid property determination device characterized by: 2. The fluid property determination device according to claim 1, further comprising a control device that controls the increase of the laser irradiation device onto the wall surface of the detection section by controlling the movement of a condensing lens. 3. The fluid property determination device according to claim 1, further comprising a control device for increasing the laser irradiation output of the laser irradiation device by switching and increasing the laser oscillation output.