JPS63228045A - Transparency meter - Google Patents

Abstract

PURPOSE:To eliminate variance due to the difference of a measuring person and to take an accurate measurement by measuring underwater transparency by utilizing a couple of glass fibers. CONSTITUTION:The front end surfaces of a couple of glass fibers 4 and 5 are arranged at a sensor part 2 opposite each other at a specific interval, a light emission part 6 is connected to the rear end of the fiber 4, and a photodetection part 7 is connected to the rear end of the fiber 5; and the tip sides of the fiber 4 and 5 are dipped in water to be measured. Further, a signal processing part 3 processes the output signal of the photodetection part 7 to obtain a signal corresponding to the transparency. Then light emitted by the light emission part 6 of the sensor part 2 is projected into the water to be measured from the tip of the fiber 4 and the light passing through the water to be measured enters the fiber 5 from its tip and is further photodetected 7. Therefore, when the quantity of the light emitted by the light emission part 6 is made constant, the photodetection part 7 photodetects light whose quantity corresponds to the transparency of the water to be measured. The output signal of the photodetection part 7 is processed by the processing part 3 to obtain the signal corresponding to the transparency, thus performing accurate measurement.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a see-through meter for measuring the see-through of water stored in water and sewage septic tanks, sewage treatment plants, and the like.

[Prior art and its problems]

Conventionally, the transparency of water stored in a water septic tank or the like has been measured using a transparency measuring tube (80) shown in FIG. This measuring tube (80) is formed of a long and thin glass tube with a length of about 40 cII+ that can accommodate water, and has a scale on the side.
81) is also displayed as a cross-shaped mark (82) on the bottom surface. In use, after filling the measuring tube (80) with the required amount of water, discard the water little by little,
The measurer visually observes the measuring tube (80) and marks (82).
The residual amount when it started to be visible was read on the scale (81), and the visibility was measured based on this.

However, such a conventional see-through measurement tube (80) has the disadvantage that the measured values vary greatly depending on the person performing the measurement, making accurate measurement difficult and requiring labor and time.

[Means for solving problems]

The purpose of the present invention is to provide a novel perspective device that solves the problems existing in the prior art described above, and this invention is achieved by the perspective device [1] shown below.

That is, in the transparency key [1] according to the present invention, the tip surfaces of a pair of glass fibers (4) and (5) are opposed to each other with a predetermined interval, and a light emitting part (6) is provided at the rear end of one of the glass fibers (4). )
At the same time, the light receiving part (7) is connected to the rear end of the other glass fiber (5), and the glass fiber (4), (
5) a sensor part (2) whose tip side is immersed in the water to be measured, and a light receiving part (7) in this sensor part (2).
It is characterized by comprising a signal processing section (3) that processes the output signal of and obtains a signal corresponding to the degree of transparency. In addition, according to the optimal embodiment, a light-shielding cover (8) is provided at the tip of the glass fibers (4) and (5) in the sensor section (2) to block external light.
), and the signal processing section (3) includes a visibility display section (9) and an alarm generating section (10) that issues an alarm when the visibility becomes below a certain value.

[For production]

Next, the present invention will be explained in detail.

First, the light emitted from the light emitting part (6) of the sensor part (2) is irradiated from the tip of the glass fiber (4) into the water to be measured.
In addition, the light that passed through the water to be measured is connected to a glass fiber (5).
Light enters from the tip of the light receiving section (7) and is further received by the light receiving section (7). Therefore, if the amount of light emitted by the light emitting section (6) is kept constant, the light receiving section (7) will receive the amount of light corresponding to the transparency of the water to be measured. Therefore, the output signal of the light receiving section (7) is processed by the signal processing section (3) to obtain a signal proportional to the degree of visibility, and a desired display or the like can be performed.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings. Fig. 1 is a block circuit diagram of the see-through meter according to the present invention, Fig. 2 is a partially sectional front view showing the probe section of the sensor unit in the see-through meter, and Fig. 3 is A in Fig. 2.
-A sectional view, FIG. 4 is a front external view of the main body unit including the signal processing section in the fluorometer, and FIG. 5 is an explanatory view showing the usage state of the fluorometer.

The see-through device [1] according to the present invention is composed of a sensor unit (20), a main body unit (30), and a power unit (40) as shown in FIG.

The sensor unit (20) includes a probe section (21).

As shown in FIGS. 2 and 3, this probe section (21) includes an elongated pipe section (50) having a pair of supporting plates (51) and (52) facing each other at its lower end.
0) is formed to a length of about 1 m to 2 m, and can be expanded or contracted as necessary. The end surfaces of the glass fibers (4) and (5) are attached to the support plates (51) and (52) so that they face each other. In addition, glass fiber <(
There is a condensing lens (53) in front of the tip surfaces of 4) and (5).
and (54) are provided. The optical path length in the water to be measured is 1c.
It is desirable that the length be around +n (approximately 5 mm to 2 cm); if it is too short, foreign objects in the water will be easily caught, and if it is too long, attenuation will increase and accuracy will decrease. Furthermore, the exposed portions of the glass fibers (4) and (5) from their tips to the pipe portions (50) are gently curved as shown in FIG. On the other hand, the glass fiber (4),
The exposed portion from the tip of (5) is covered with a cylindrical light-shielding cover (8) fixed to the center of the upper end surface (8a) through a pipe portion (50). Note that a hole (56) for draining water is bored in the upper end surface (8a).

On the other hand, the upper end of the pipe section (50) of this probe section (21) is attached to the sensor unit main body (57) as shown in FIG. This sensor unit main body (57) houses the parts of the sensor unit (20) other than the probe part (21), and has a flange part (57a) that is integrated into the main body (57).
) is installed on the lid (61) of the water reservoir (60), etc.

As a result, the tip of the probe part (21) is connected to the water reservoir (60
) to a predetermined depth.

On the other hand, the sensor unit (20) further includes a probe section (20).
A light emitting element (22) such as a light emitting diode connected to the rear end of one of the glass fibers (4) of
) and maintains a constant amount of light (23)
and the other glass fiber (5) of the probe part (21).
A light receiving element such as a phototransistor (2
4), an amplifier circuit (25) that amplifies the output of this light receiving element (24), and a lens (25) for the output of this circuit (25).
53), a logarithmic amplifier circuit (26) that linearizes the non-linear characteristics resulting from the use of (54), and this circuit (26).
) is comprised of a V-I conversion circuit (27) that performs voltage-to-current conversion on the output of the converter (27) to reduce attenuation during power transmission.

With the circuit configuration (20) of the above sensor unit,
A signal whose magnitude is proportional to the visibility is obtained at the output of the V-I conversion circuit (27). Then, this V-I conversion circuit (27
) and the input end of the main unit (30) are connected with a transmission cable (41) of the required length, and the sensor unit 1-
The output signal (Sl) of (20) is sent to the main unit (30).

Note that the length of this transmission cable (41) can be selected from 200 m to 300 m as necessary. Further, the sensor unit (20) is supplied with required driving power from the power unit (40) via the main unit (30).

On the other hand, the main unit (30) is connected to the sensor unit (2).
I that performs current-voltage conversion on the output signal (Sl) of
-■ The conversion circuit (31) compares the output signal (S2) of this circuit (31) with the reference signal (S3) set in advance with the volume (32), and the output signal (S2) is compared with the reference signal (S3). ), that is, when the visibility is below a certain value, a comparator (34) lights up an alarm lamp (33), and this comparator (3
A buffer (35) that obtains a stable external output (for recorders, etc.) from the output voltage of 4) of about 0 to 5 mm, and a digital display that converts the output voltage value of the comparator (34) into a frequency value. V-F conversion circuit to drive (36
) and a digital display (37) into which the output of this circuit (36) is input. In addition, the IV conversion circuit (31)
has a zero adjustment volume (38) and a full adjustment volume (
39). Then, immerse the probe 1l (21) in completely turbid water and adjust the zero adjustment volume (38).
The probe part (21) is then immersed in clear water, and the full adjustment polycomb (39) is varied to perform a full adjustment.

In this way, the main unit (30) can display the degree of visibility using the digital meter (37) and is equipped with various adjustment functions.

The main body unit (30) is housed in a predetermined case or the like, and can be installed, for example, in a control panel for controlling a pump, etc., which is provided apart from the water storage layer (60), as shown in FIG. In addition, the front panel (71) of the main unit (30)
As shown in the figure, a power switch (72), a low alarm lamp (73), a low alarm adjustment knob (74) that changes the volume (32), a low alarm changeover switch (75), and a low alarm switch (75) that changes the volume (38). It includes a zero adjustment knob (76), a full adjustment knob (77) for varying the volume (39), and the digital display (37) for displaying the degree of transparency.

Although the embodiments have been described in detail above, the present invention is not limited to these embodiments.

For example, the sensor unit (20) and the main unit (30)
) is formed separately and connected with a transmission cable (41), but only the probe part (21) is formed separately, and other sensor units (20) i and main unit (3) are connected.
0) may be constructed in one body, preferably in a portable form, or all of them may be constructed in one body. It can also be applied to measuring the visibility of stored water as well as the visibility of gases such as smoke. Furthermore, the probe part (21)
The shape, configuration, etc. of the sensor unit (20) and the main unit 1-(30) may be optionally added with an optional auxiliary circuit such as a temperature compensation circuit.

[Effects of the Invention] As described above, the see-through meter according to the present invention uses a pair of glass fibers to measure the see-through level in water, and thus obtains the following effects.

■Since light is transmitted through the device and the amount of transmitted light is converted into an electrical signal for measurement, there is no variation due to differences in measurement personnel, and accurate measurement values can be obtained.

■Measurements can be made by simply setting up a see-through meter at all times and taking readings as needed, which eliminates the need for much labor and time for the measurer. Further, since continuous measurement is possible, changing characteristics etc. can be easily obtained, and remote measurement is also easy.

■Using glass fiber, it has excellent waterproof properties, and the configuration of the probe section can be significantly simplified, resulting in excellent reliability and low cost.

[Brief explanation of drawings]

Fig. 1: Block circuit diagram of the see-through meter according to the present invention, Fig. 2: Partial cross-sectional front view showing the probe section of the sensor unit in the see-through meter, Fig. 3: Cross section taken along line A-A in Fig. 2. Figure 4: A front external view of the main unit including the signal processing section in the fluorometer, and Figure 5: An explanatory diagram showing the usage state of the fluorometer. In the drawing, [1]: Transparency liver (2): Sensor section (3): Signal processing section (4), (5) Nigelas fiber (6)
Two light emitting parts (A): Light receiving part (8): Light shielding cover (9): Display part (10): Alarm generating part Patent applicant Fukashi Electric Works Co., Ltd. Patent attorney 1) Shigeru Figure 2 Figure 5 Figure 6 April 6, 1988 Patent Application No. 314583 3, Relationship with the case of the person making the amendment Patent applicant 238-3 Yokota, Matsumoto City, Nagano Prefecture Representative of Fukashi Electric Works Co., Ltd. Takeshi Higuchi 4 , Agent Address: 5F, 5th Floor, Fuji Fire Nagano Building, 1393-3 Midoricho, Nagano City, Nagano Prefecture, 380 Prefecture, Date of Amendment Order: March 4, 1985 7. Figure 5: An explanatory diagram showing how the perspective meter is used.'' has been corrected as follows.

Claims (1)

[Scope of Claims] [1] The tip surfaces of a pair of glass fibers are opposed to each other with a predetermined interval, and a light emitting part is connected to the rear end of one glass fiber, and a light receiving part is connected to the rear end of the other glass fiber. and a signal processing section that processes the output signal of the light receiving section in the sensor section and obtains a signal corresponding to the degree of visibility. [2] The fluorometer according to claim 1, characterized in that the tip of the glass fiber in the sensor section is provided with a light-shielding cover that blocks external light. [3] The visibility meter according to claim 1, wherein the signal processing unit includes a display unit that displays visibility. [4] The fluorometer according to claim 1, wherein the signal processing section includes an alarm generation section that issues an alarm when the degree of visibility falls below a certain value.