JPH051807Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a light emitting device and a light receiving device in an optical measuring instrument, and a flocculation sediment measuring device using these devices.

[Conventional technology]

Conventionally, for light-emitting devices or light-receiving devices that have an air layer inside, moisture in the air inside the light-emitting device or light-receiving device condenses on the glass surface due to the temperature difference between the outside and the inside of the light-emitting device or light-receiving device, resulting in accurate measurement. The amount of light emitted or received may be hindered. In order to prevent this phenomenon, dry air is supplied into the light-emitting device or light-receiving device of optical measuring instruments that emit or receive a precise amount of light, or a desiccant is used inside the light-emitting device or the light-receiving device. Built-in and compatible.

Further, as one of the conventional methods for treating water, sewage, industrial wastewater, etc., there is a coagulation-sedimentation method. The coagulation-sedimentation reaction in the coagulation-sedimentation method is evaluated by the diameter of the aggregates produced, the sedimentation rate, and the clarity, or turbidity, of the treated water, and the coagulation-sedimentation device is designed to maintain these indicators at a predetermined level. Ideally, this should be maintained by adjusting the flocculant injection rate, stirring conditions, etc. A method and apparatus for measuring the coagulation-sedimentation reaction in such a coagulation-sedimentation method is disclosed, for example, in JP-A-62-255851. The coagulation-sedimentation measuring device adds a coagulation-sedimentation agent to a suspension in a stirring tank, causes the suspension to coagulate while stirring for a desired period of time, and then stops the stirring to allow the aggregates to settle. It is a device for measuring the state of aggregation, and is provided with a light emitting part and a light receiving part that receives transmitted light and/or scattered light from the light emitting part at a predetermined position below the liquid surface of the stirring tank, and further includes a light receiving part that receives transmitted light and/or scattered light from the light emitting part. A detector that can detect the temporal pattern of the received light signal is connected to the sensor. The flocculation sedimentation measurement device configured in this way can be used to
This measures the sedimentation rate and turbidity of treated water.

[The problem that the idea attempts to solve]

However, in order to prevent moisture in the air inside the light-emitting device or light-receiving device that has an air layer from condensing on the glass surface due to the temperature difference between the outside and the inside, dry air is placed inside the device. The method of supplying air requires equipment to produce and supply dry air, and the method of incorporating a desiccant inside requires filling and replacing the desiccant. Therefore, such light-emitting devices and light-receiving devices are expensive in terms of the devices themselves and their running costs, and they are expensive in terms of the device itself and the running costs, and they are also expensive in terms of the light emitting device of an optical measuring device or the lighting device that needs to irradiate a precise amount of light. It has been undesirable to use it in a light emitter or a light receiver of an optical measuring instrument that requires precise measurement of the amount of light because it may not be possible to obtain highly accurate measurement results. For example, it was similarly undesirable when applied to the above-mentioned coagulation sedimentation measuring device. Therefore, how can the light emitting device and the light receiving device be configured without installing equipment to produce and supply dry air to the light emitting device and the light receiving device, or without having a built-in desiccant inside? The question was whether it would be possible to avoid the negative effects of the temperature difference between the two.

The purpose of this invention is to solve the above problems; there is no need for dry air production and air supply equipment, or no need to insert or replace a desiccant;
To provide a light-emitting device and a light-receiving device that can always emit a predetermined amount of light without causing dew condensation inside due to temperature differences between inside and outside, can accurately measure a predetermined amount of light, and have a simple structure and are easy to handle. At the same time, it is an object of the present invention to provide an extremely preferable coagulation sedimentation measuring device by applying the light emitting device and the light receiving device.

[Means to solve the problem]

In order to solve the above problems and achieve the above objectives, this invention is configured as follows. That is, this invention is characterized in that a light-emitting device is disposed in a sealable box, a light-transmitting plate is attached to the box facing the light-emitting device, and a light-transmitting liquid is sealed in the box. The present invention relates to a light emitting device.

Further, this invention is characterized in that a light-receiving element is disposed inside a sealable box, a light-transmitting plate is attached to the box facing the light-receiving element, and a light-transmitting liquid is sealed in the box. The present invention relates to a light receiving device.

Furthermore, this device adds a flocculant-sedimenting agent to the suspension in the stirring tank, stirs it for a predetermined period of time to flocculate the suspension, and then stops stirring to allow the flocs to settle. A coagulation sedimentation measuring device for measuring the state of aggregation includes a light-emitting device in which a light emitting device is disposed opposite to a light-transmissible plate that forms a part of a box in which a light-transmissible liquid is enclosed, and a light-transmissible liquid is enclosed in the light-emitting device. A light receiving device having a light receiving element arranged opposite to a light transmitting plate forming a part of the box is installed at a predetermined position below the liquid surface of the stirring tank, and a time pattern of a light reception signal is transmitted to the light receiving device. The present invention relates to an apparatus for measuring coagulation and sedimentation of a suspension, which is characterized in that it is connected to a detector that can detect the coagulation and sedimentation of a suspension.

[Effect]

This invention is constructed as described above and operates as follows. That is, in the light-emitting device according to this invention, since the light-emitting device is placed opposite to a light-transmissible plate such as transparent glass that forms part of a box in which a light-transmissible liquid such as a transparent liquid is sealed, there is no risk of condensation. Air with high temperature can be purged from inside the light emitting device, so even if there is a temperature difference with the outside air, there will be no condensation.

In the light-receiving device according to this invention, the light-receiving element is placed opposite to a light-transmissible plate such as transparent glass that forms part of a box filled with a light-transmissible liquid such as a transparent liquid, so there is a risk of condensation. Air can be purged from the inside of the light receiving device, and therefore no condensation occurs even if there is a temperature difference with the outside air.

Since the coagulation sedimentation measuring device according to this invention uses the above-mentioned light emitting device and light receiving device, the measurement results are extremely reliable.

〔Example〕

Hereinafter, embodiments of this invention will be described with reference to the drawings.

First, an embodiment of the light emitting device according to this invention will be described with reference to FIGS. 1 and 2. This light emitting device 1 has a light emitting device 3 such as a lamp as a light source placed inside a box 2 constituting a cylindrical container.
is constructed in a sealed state, and a light-transmissible liquid 7 such as a transparent liquid is sealed inside. A light-transmissible plate 8 made of transparent glass or the like is fixed with an adhesive or the like to a surface forming a part of the box 2 facing the light emitting device 3 disposed inside the box 2. Furthermore, in order to seal the light-transmissible liquid 7 inside the box 2, for example, the light-transmissible liquid 7 is injected through one hole 9 formed in the case 2, and the light-transmissible liquid 7 is injected into the box 2 through the other hole 10. Encapsulation can be achieved by removing the air from the housing 2 and plugging each hole 9, 10 with a stopper 5, 6 while the box 2 is completely filled with the light-transmissible liquid 7 over the entire area. in this way,
By configuring the light emitting device 1, current is sent to the light emitting device 2, such as a lamp, through the power cord 4, and the light emitting device 2 emits light. The light from the light emitter 2 is passed through the light-transmissible liquid 7 in the box 2 and the light-transmissible plate 8 on one side of the box 2 to the box 2.
can be transmitted to the outside. In this light emitting device 1, the light-transmissible liquid 7 is sealed inside the box 2, so even if there is a temperature difference between the inside and outside of the box 2, there is no air inside the box 2. Since there is no layer, no condensation occurs on the light-transmissible plate 8.

Next, an embodiment of the light receiving device according to this invention will be described with reference to FIGS. 3 and 4. This light-receiving device 11 includes a light-receiving element 13 that receives transmitted light, scattered light, etc. from the outside in a box 12 constituting a cylindrical container, and the box 12 is configured in a sealed state. A light-transmissible liquid 17 such as a transparent liquid is sealed inside. A light-transmissible plate 18 such as transparent glass is fixed with an adhesive or the like to a surface forming a part of the box 12 facing the light receiving element 13 disposed inside the box 12. Furthermore, in order to seal the light-transmissible liquid 17 inside the box 12, for example, the light-transmissible liquid 17 is injected through one hole 19 formed in the box 12, and the light-transmissible liquid 17 is injected into the box 12 through the other hole 20. The air is removed from each hole 19, and the light transmittable liquid 17 is completely filled in the entire area of the case 12.
Encapsulation can be achieved by plugging 20 with plugs 15,16. By configuring the light receiving device 11 in this way, light such as transmitted light and scattered light from the light emitter 2 etc. which is a light source is transmitted to the light transmittable plate 18 on one side of the box 12, and then to the box 12. Light-transmissible liquid 1
The light can be received by the light receiving element 13 through the light receiving element 7 . The light receiving signal input to the light receiving element 13 is configured to be sent to a detector or the like via a lead wire 14. In this light-receiving device 11, a light-transmissible liquid 17 is sealed in the case 12, so that
Even if a temperature difference occurs between the inside and outside of the box 12, no dew condensation occurs on the light-transmissible plate 18 of the box 12.

In the above embodiment of the light emitting device 1, a light source such as a tungsten lamp is illustrated as the light emitter 3, but
Of course, not only the tungsten lamp but also a light emitting diode, a laser, a halogen lamp, etc. may be used. In addition, as for the light-transmissible liquid 7 sealed in the case 2, since it was necessary to electrically insulate it in the above embodiment, silicone oil, especially colorless and transparent silicone oil, was used. Not limited to oil, colored or colorless liquids such as alcohol, water, and ink,
That is, it goes without saying that any liquid that can transmit light is sufficient. For example, in the case of colored liquids,
Of course, it is desirable to have a color that does not affect the measurement wavelength.

Furthermore, in the embodiment of the light receiving device 11 described above, a photodiode was used as the light receiving element 13;
Of course, other light receiving elements such as CCD may also be used. Regarding the light-transmissible liquid 17 sealed in the case 12, silicone oil, especially colorless and transparent silicone oil, is used in the above embodiment, but it is not limited to colorless and transparent silicone oil, and may include alcohol, water, ink, etc. Of course, any colored liquid or colorless liquid, such as liquids that can transmit light, may be used. Further, as described above, for example, in the case of a colored liquid, it is of course desirable to use a color that does not affect the measurement wavelength.

Further, in each of the above embodiments, the shapes of the boxes 2 and 12 are cylindrical, but they do not necessarily have to be cylindrical, and can be configured in various shapes, such as rectangular or elliptical. In addition, a light transmittable plate 8,
Although colorless and transparent glass was explained as 18, any other light-transmissive plate such as colored transparent glass, polarized glass, acrylic, etc., can be used as long as it is a plate that transmits light and does not react with the liquid inside. But it's good. Further, as described above, in the case of colored transparent glass, for example, it is of course desirable that the color does not affect the measurement wavelength.

Furthermore, as an embodiment of this invention, the light emitting device 1 and light receiving device 11 according to the invention described above are extremely preferable when applied to, for example, the flocculation sedimentation measuring device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 62-255851. be. Conventionally, the coagulation-sedimentation reaction in the coagulation-sedimentation method, which is one of the methods for treating water, sewage, industrial wastewater, etc., is evaluated by the diameter of the aggregates produced, the sedimentation rate, and the clarity of the treated water, that is, the turbidity. However, the above-mentioned light emitting device 1 and light receiving device 11 can be applied as the light emitting section and the light receiving section in the measuring device for the coagulation precipitation reaction in the coagulation precipitation method.

An example of the above-mentioned coagulation sedimentation measuring device will be outlined with reference to FIG. 5. The entire stirring tank 21 is placed in a dark box 25 to prevent interference from external light. A light emitting device 1 and a light receiving device 11 for transmitted light are installed at a predetermined position facing the stirring tank 21 and below the liquid level H of the stirring tank 21 to form an optical path 27. A light receiving device 26 for scattered light having the same configuration as the light receiving device 11 is installed at a position where it does not block the optical path 27 formed by the light receiving device 11 and the light receiving device 11. Further, a stirrer 22 is installed in the stirring tank 21, and a flocculating and precipitating agent inlet 24 is provided. In the coagulation sedimentation measuring device configured as described above, a coagulation precipitant is added to the suspension in the stirring tank 21 through the coagulation precipitant injection port 24, and the motor 2
The suspension is agitated for a predetermined period of time by an agitator 22 operated by a pump 3 to flocculate the suspension. After that, the agitation is stopped and the aggregates are allowed to settle to measure the aggregation state of the suspension, and the light receiving device 11 for transmitted light and/or the light receiving device 26 for scattered light from the light emitting device 1 is used. The temporal pattern of the light reception signal received by the detector and input to the light receiving element 13 of the light receiving device 11, 26 is sent to the detector via the lead wire 14, and the measurement result obtained by the detector is used to detect the temperature inside the stirring tank. This measures the size of aggregates, sedimentation rate, and turbidity of treated water. In this case, the light emitting device 1 and the light receiving device 1
Since the light emitting device 1 and 26 do not have a gas or air layer inside and no dew condensation occurs on the inner wall surface, the light emitting device 1
can irradiate the light amount accurately and uniformly,
Further, since the light receiving devices 11 and 26 can measure the amount of light precisely and uniformly, the measurement results are extremely accurate.

[Effect of idea]

Since this invention is configured as described above, it has the following effects. That is, in the light-emitting device according to this invention, since the light-emitting device is placed opposite to a light-transmissible plate such as transparent glass that forms part of a box in which a light-transmissible liquid such as a transparent liquid is sealed, there is no risk of condensation. Some air can be purged from the inside of the light emitting device, so even if there is a temperature difference with the outside air, there will be no condensation because the inside is liquid and no gas exists. Therefore, fluctuations in the amount of light from the light emitting device, such as those caused by dew condensation on the light transmitting plate, do not occur, and fluctuations in the amount of light to the light receiving device can be prevented. Therefore, it is extremely preferable for use in a light emitting device of an optical measuring instrument or a lighting device that requires irradiation with a precise amount of light. Furthermore, there is no need for dry air production or air supply equipment, which was required in the conventional method of preventing condensation using dry air, and there is no need to insert or replace the desiccant, which was required in the method of inserting a desiccant. There is no need to
These facilities and operations can be saved, and stable and reliable light irradiation can be achieved.

In addition, in the light receiving device according to this invention, the light receiving element is placed opposite the light transmitting plate such as transparent glass, which forms part of the surface of the box filled with a light transmittable liquid such as a transparent liquid. It is possible to purge the interior of the light-receiving device from air that may cause dew, and therefore no dew condensation will form on the inner wall surface even if there is a temperature difference with the outside air. Therefore, fluctuations in the amount of light that occur due to dew condensation on the light-transmitting plate do not occur, and fluctuations in the amount of light to the light-receiving element can be prevented, making it possible to receive extremely stable and highly accurate light. . Therefore, it is extremely preferable to use it in a light receiving device of an optical measuring instrument that needs to measure the amount of light accurately and uniformly. Furthermore, as in the case of the light emitting device described above, it has effects superior to those of the prior art.

Since the coagulation sedimentation measuring device according to this invention uses the above-mentioned light emitting device and light receiving device, the measurement results are extremely reliable and stable.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a light emitting device according to this invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a sectional view showing an example of a light receiving device according to this invention, and FIG. and FIG. 5 are schematic explanatory diagrams showing an example of the flocculation sedimentation measuring device according to this invention. 1... Light emitting device, 2, 12... Box, 3... Light emitter, 5, 6, 15, 16... Plug, 7, 17...
Transparent liquid (liquid capable of transmitting light), 8, 18...Transparent glass (plate capable of transmitting light), 11, 26... Light receiving device, 13... Light receiving element.

Claims (1)

[Claims for Utility Model Registration] (1) A light emitting device is disposed inside a sealable box, a light transmitting plate is attached to the box facing the light emitting device, and a light transmitting liquid is placed inside the box. A light emitting device characterized by being enclosed. (2) A light-receiving device characterized in that a light-receiving element is disposed in a hermetically sealed box, a light-transmitting plate is attached to the box facing the light-receiving element, and a light-transmitting liquid is sealed in the box. Device. (3) After adding a flocculation-sedimenting agent to the suspension in the stirring tank and stirring for a predetermined period of time to flocculate the suspension, the stirring is stopped and the flocculates are allowed to settle to check the flocculation state of the suspension. The coagulation sedimentation measuring device to be measured includes a light-emitting device in which a light emitting device is disposed opposite to a light-transmissible plate forming a part of a box in which a light-transmissible liquid is enclosed, and a case in which a light-transmissible liquid is enclosed. A light receiving device having a light receiving element arranged opposite to a light transmittable plate forming a part thereof is installed at a predetermined position below the liquid surface of the stirring tank, and the light receiving device can detect a pattern over time of the light reception signal. A suspension flocculation and sedimentation measuring device characterized by being connected to a detector.