JP2011075432A - Detector and jig - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detector capable of readily performing the positional adjustment and/or calibration work to a detection surface, and to provide a jig. <P>SOLUTION: At positional adjustment and/or calibration of an oil film detector, a target plate 6 and the jig 7 are attached to a hood. When a scanning laser beam L3 advances into the inside 7a of the jig 7 from the opening section 61 of the target plate 6, it is reflected by the detection surface Ws of a container 74. The reflected light L4s projects a predetermined scanning locus on the surface 6b of the target plate 6. The inside of the jig 7 restricts the incidence of the external light of the jig 7. Accordingly, a worker can visually and readily confirm the position of the scanning locus with respect to the opening section 61 via the mirror 8 arranged in a window section 78. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a detector for detecting an object to be detected on a detection surface and a jig attached to the detector.

  When foreign matter such as oil film is present in water purification plants, rivers, lakes, etc., it is necessary to take measures such as stopping water intake, so that oil film detection is always required. In order to meet such demands, various oil film detection devices have been proposed. To explain further, an oil film detection device using an oil film detection method is known in which the reflectance is obtained by irradiating light on the water surface and measuring the intensity of the reflected light, thereby detecting the presence or absence of an oil film on the water surface. ing. According to such a detection device, even an oil film having a small area over a wide range can be detected without being affected by the state of the water surface (water level fluctuations, waves, presence or absence of suspended matter, etc.).

  Various structures have been proposed for such non-contact oil film detection devices (see, for example, Patent Document 1). This Patent Document 1 discloses an oil film detection device including a two-dimensional scanning unit that scans detection light two-dimensionally and forms a desired plane as a detection light irradiation range on a detection target surface.

International Publication No. 2009/022649

  Here, in a detector that detects an object to be detected on the detection surface, it is necessary to adjust the position of the detector with respect to the detection surface at the time of installation at a detection place or during periodic inspection after installation. Further, such a detector needs to be calibrated periodically. Although such position adjustment and calibration are not always performed, there is a demand for improvement in workability because it is necessary work for ensuring detection accuracy.

  The present invention has been made to solve the technical problems as described above, and an object of the present invention is to provide a detector capable of easily performing position adjustment and / or calibration work on the detection surface. And providing a jig.

  For this purpose, the detector to which the present invention is applied is an optical system configured such that parallel light having a predetermined irradiation range is directed to the detection surface, and reflected light reflected by the detection surface is directed to the light receiving unit. Position adjusting means for adjusting the position of the optical system with respect to the detection surface, detection means for detecting the state of the detection surface based on the reflected light of the optical system, the parallel light of the optical system, and A cylindrical member that forms a passage through which the reflected light passes, and a jig that is used for adjustment by the position adjustment means and / or calibration of the detection means and is position-adjusted together with the adjustment. The tool has a generation unit for generating a detection surface for adjustment and calibration for the adjustment and / or the calibration.

  Here, the jig further includes a plate-like member that has an opening through which the parallel light and the reflected light of the optical system pass, and is disposed at a position that blocks the passage formed by the cylindrical member. Is detachably attached to the cylindrical member, and the jig is attached to the surface of the plate-like member on which the locus of reflected light for adjustment calibration reflected by the detection surface for adjustment calibration in the generation unit is reflected. It may be characterized by further having a restricting portion for restricting the incident light so that the light outside the jig is not exposed. In addition, the jig is located on the holding portion that holds the plate-like member, a window portion that connects the restriction portion and the outside of the jig, and the surface of the plate-like member. And a mirror member that makes it possible to visually recognize the locus of the reflected light for adjustment / calibration reflected on the outside of the jig through the window portion. Furthermore, the jig may further include a changing unit that changes a separation distance between the optical system and the generation unit of the jig to a predetermined value.

  The jig to which the present invention is applied includes an optical system configured such that parallel light having a predetermined irradiation range is directed to the detection surface and reflected light reflected by the detection surface is directed to the light receiving unit, and the optical system. Position adjusting means for adjusting the position with respect to the detection surface, detection means for detecting the state of the detection surface based on the reflected light of the optical system, and a path through which the parallel light and the reflected light of the optical system pass A jig that is attached to a detector having a cylindrical member, and is used for adjustment by the position adjustment means and / or calibration of the detection means, the position being adjusted together with the adjustment, and the adjustment And / or a generator for generating an adjustment calibration detection surface for the calibration.

  According to the present invention, it is possible to easily perform position adjustment and / or calibration work on the detection surface.

It is a block diagram which shows the structural example of the oil film detector which concerns on this Embodiment. It is a block diagram which shows another structural example of the oil film detector which concerns on this Embodiment. It is a block diagram which shows another structural example of the oil film detector which concerns on this Embodiment. It is the schematic which shows the example of installation in the case of installing an oil film detector in a detection place. It is a figure for demonstrating the procedure at the time of installing an oil film detector in a bank protection. It is a figure for demonstrating the procedure at the time of installing an oil film detector in a bank protection. It is a front view explaining a jig | tool. It is a perspective view explaining the upper part of a jig | tool. It is a figure explaining the position adjustment performed by attaching a jig to the hood of the oil film detector. It is a figure explaining the position adjustment performed by attaching a jig to the hood of the oil film detector. It is a figure explaining the calibration performed by attaching a jig to the hood of an oil film detector.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
1-1 is a block diagram showing a configuration example of the oil film detector E1 according to the present embodiment.
The oil film detector E1 shown in the figure utilizes the property that the reflectance of light when the oil film is present on the liquid surface is different from the reflectance of light when the oil film is not present, ) Is an apparatus for detecting whether or not there is an oil film as a detected object. The water surface W indicates the water surface of a water purification plant, a river, a lake, or the like, for example, and the position of the water surface W is increased or decreased, and the water surface W is undulated.

The oil film detector E1 includes a laser light source 100 that emits laser light L1, and an irradiation unit 200 that acts so that the laser light L1 emitted from the laser light source 100 irradiates a predetermined range. More specifically, the irradiation unit 200 outputs a laser beam L2 that irradiates a predetermined range by scanning the laser beam L1. The laser light L2 is so-called parallel light that has no or almost no difference in size between the cross-sectional area upstream of the optical path of the laser light L2 and the cross-sectional area downstream of the optical path.
In the present specification, the term “parallel light” refers to laser light in which the cross-sectional area of the light formed in the beam group is substantially unchanged depending on the position on the optical path by scanning one laser light. .

The oil film detector E1 includes a coaxial incident part 300 that guides the laser beams L3 and L4 so that the optical axis of the laser beam L3 applied to the water surface W and the optical axis of the laser beam L4 reflected by the water surface W are coaxial. And a light receiving unit 400 that receives the laser beam L5 from the coaxial incident unit 300. The coaxial epi-illumination unit 300 includes a half mirror 310 that reflects part of incident light and transmits the rest. The half mirror 310 is a plate-like member formed so that the intensity of reflected light and transmitted light is substantially equal. The irradiation unit 200, the coaxial incident unit 300, and the half mirror 310 are examples of optical systems, the light receiving unit 400, the calculation unit 500, and the determination unit 600 are examples of detection means, and the laser beam L3 is a parallel light. The laser beam L4 is an example of reflected light.
More specifically, the coaxial epi-illumination unit 300 reflects the laser beam L2 from the irradiation unit 200 to the half mirror 310, guides the reflected laser beam L3 to the water surface W, and reflects the laser beam L3 on the water surface W. The totally reflected laser beam L4 is transmitted through the half mirror 310, and the transmitted laser beam L5 is guided to be received by the light receiving unit 400. The laser beam L4 is reflected from the water surface W at an angle equal to the incident angle of the laser beam L3. That is, the incident angle of the laser beam L3 and the reflection angle of the laser beam L4 are equal to each other.

Thus, the irradiation unit 200 is configured to output detection light used for detecting an oil film on the water surface W as parallel light that irradiates a predetermined range. The coaxial epi-illumination unit 300 is configured to cause the detection light to be totally reflected on the water surface W via the half mirror 310 and to direct the detection light that has been totally reflected to the light receiving unit 400 via the half mirror 310.
For this reason, it is possible to irradiate the detection light over a wide range, and even if the height of the water surface W fluctuates and the distance to the oil film detector E1 changes, the light reception unit 400 receives the detection light necessary for oil film detection. Even if the water surface W undulates, it is not affected by the detection light necessary for detecting the oil film.

  Further, the oil film detector E1 obtains intensity information of the laser beam L5 by converting the laser beam L5 received by the light receiving unit 400 into a predetermined signal, and calculates the reflectance of the water surface W, and a calculation unit Based on the calculation result of 500, a determination unit 600 that determines whether or not an oil film exists on the water surface W, and a notification unit 700 that notifies the user when the determination unit 600 determines that an oil film exists on the water surface W. And.

  Here, as the laser light source 100, an example configured by a laser diode (not shown) and a drive circuit (not shown) that controls the laser diode so that a predetermined voltage is applied can be considered.

The configuration of the coaxial epi-illumination unit 300 is as described above.
In addition, an example in which the light receiving unit 400 includes a condensing lens (not shown) for condensing the laser light L5 and a photodiode (not shown) that converts the light into an electric signal corresponding to the intensity of the collected light is considered. It is done.

Further, as the calculation unit 500 and the determination unit 600, a CPU (Central Processing Unit) (not shown) that performs digital calculation processing according to a predetermined operation control program (firmware), a CPU working memory, and the like (not shown) are used. An example of a RAM (Random Access Memory) and a ROM (Read Only Memory) (not shown) that stores processing programs executed by the CPU and various data used in the processing programs can be considered.
Further, the notification unit 700 may be configured with a display screen (not shown) that visually notifies the user, and is configured with a communication interface for notifying a remote user by general-purpose communication means. Examples are possible.

FIG. 1-2 is a block diagram illustrating another configuration example of the oil film detector E2 according to the present embodiment. The basic configuration of the oil film detector E2 is the same as that of the above-described oil film detector E1 (see FIG. 1-1). Therefore, the same reference numerals are used for the same components, and the description thereof may be omitted. .
The oil film detector E2 shown in the figure includes a laser light source (not shown), an irradiation unit 200, a light collecting unit 800, a light receiving unit 400, a calculation unit (not shown), a determination unit (not shown), and a notification unit (not shown). It has. The condensing unit 800 is configured by a parabolic mirror or a concave mirror having a parabolic or elliptical reflecting surface.

The condensing unit 800 provided in the oil film detector E2 is formed with a window hole 810 through which the laser beam output from the irradiation unit 200 passes, and the lower surface of the condensing unit 800 reflects light reflected from the water surface W. A reflection surface 820 made of an object surface or an elliptical curved surface is formed.
That is, the oil film detector E2 causes the laser light from the irradiation unit 200 to pass through the window hole 810 of the light collecting unit 800 toward the water surface W, and reflects light from the water surface W to the reflective surface 820 of the light collecting unit 800. And is guided to the light receiving unit 400.

1-3 is a block diagram illustrating another configuration example of the oil film detector E3 according to the present embodiment. The basic configuration of the oil film detector E3 is common to the above-described oil film detectors E1 and E2 (see FIG. 1-1 or FIG. 1-2). Description may be omitted.
Here, the configuration in which the oil film detector E3 is different from the oil film detector E2 will be specifically described. The oil film detector E3 is different in that the irradiation unit 200 is disposed at a position where it does not receive interference from the light collecting unit 800, and the window hole 810 (see FIG. 1-2) is not formed in the light collecting unit 800. That is, the irradiation unit 200 of the oil film detector E3 directs the laser light toward the water surface W without being blocked by the light collecting unit 800, and reflects the reflected light from the water surface W at the reflecting surface 820 of the light collecting unit 800. The light receiving unit 400 is configured to guide the light.

Next, installation of the oil film detector E at the detection location will be described. For convenience of explanation, the oil film detectors E1, E2, E3 may be referred to as an oil film detector E.
FIG. 2 is a schematic diagram showing an installation example when the oil film detector E is installed at a detection place.
As shown in FIG. 2, the oil film detector E is attached to the support column 11 installed in a standing state on the revetment, the mounting arm 12 extending from the upper side of the support column 11 to the side, and the upper end of the support column 11. And an operation / control unit 13 for performing operation and control for oil film detection. In addition, in order to improve the installation workability of the oil film detector E, the mounting arm 12 has a structure whose position can be changed around the axis extending in the longitudinal direction (vertical direction in FIG. 2) of the column 11 ( 2 and 3). That is, when installing the oil film detector E, the mounting arm 12 may be positioned on the water surface W side with respect to the support column 11 (see FIG. 2), or may be positioned on the revetment side with respect to the support column 11 (see FIG. 3). Is possible.

The support column 11 and the mounting arm 12 are structural members fixed to the revetment in order to detect an oil film on the water surface W, and in this embodiment, both are configured by tubular members. Further, a plate-like protruding piece 12 a in which a round hole is formed is provided upright on the upper portion of the mounting arm 12. A wire 31 is attached to the protruding piece 12a of the mounting arm 12 to prevent the main body 22 from shaking due to wind or the like. One end of the wire 31 is fixed to the round hole of the protruding piece 12a, and the other end (not shown) is fixed to a stronger structure.
The operation / control unit 13 includes various operation units 13a for receiving user operations, a control unit (not shown) that performs various controls based on operations of the operation unit 13a, and a display unit 13b that displays detection results to the user. And a communication interface (not shown).

The oil film detector E includes an attachment plate 21 that can be engaged with the attachment arm 12, and a main body portion 22 that is attached to the distal end of the attachment arm 12 via the attachment plate 21, with the attachment plate 21 fastened with a bolt. It is equipped with.
The main body 22 is a heavy object covered with a cover manufactured by die casting or the like, for example. An eyebolt 22 a is provided on the upper portion of the main body 22.

In addition, a hood 23 as an example of a cylindrical member for reducing the influence of external light when oil film detection is performed is provided at the lower portion of the main body portion 22. The hood 23 is made of metal, more specifically, aluminum.
The lower part of the hood 23 of the oil film detector E is opened to form a space where the laser beam L3 is irradiated. In other words, the laser light L3 is irradiated from the oil film detector E toward the water surface W through the hood 23, and the laser light L4 passes through the hood 23 and the light receiving unit 400 of the oil film detector E (FIG. 1−). 1 to FIG. 1-3).

The main body 22 is electrically connected to the operation / control unit 13 by a cable (not shown). When the main body 22 irradiates the laser beam L3 toward the water surface W under the control of the operation / control unit 13 and receives the laser beam L4 reflected by the water surface W, the main body unit 22 outputs the signal to the operation / control unit 13 as a signal.
The attachment arm 12 and the attachment plate 21 are an example of position adjusting means.

2 includes the laser light source 100, the irradiation unit 200, the coaxial incident unit 300 (or the condensing unit 800), and the light receiving unit illustrated in FIGS. 1-1, 1-2, and 1-3. 400, and the operation / control unit 13 shown in the figure includes a calculation unit 500, a determination unit 600, and a notification unit 700.
In addition, the support | pillar 11 and the attachment arm 12 are examples of a structural member, and the attachment plate 21 is an example of an attachment member.

3 and 4 are diagrams for explaining a procedure when the oil film detector E is installed on the revetment. 3 is a schematic view showing a state in the middle of installation of the oil film detector E, and FIG. 4 is a perspective view showing a state in which the oil film detector E is completely installed. In FIG. 4, illustration of the eyebolt 22a shown in FIG. 3 is omitted.
As shown in FIG. 3, after fixing the support 11 to the revetment, the operator attaches the mounting arm 12 and the operation / control unit 13 to the support 11 with bolts (not shown). In the figure, the mounting arm 12 is located on the revetment side with respect to the support 11.
Here, the mounting arm 12 is formed with a tube-shaped arm main body portion 41, a flange portion 42 formed at the distal end portion of the arm main body portion 41, and a diameter smaller than the flange portion 42 adjacent to the flange portion 42. An annular portion 43, and a concave portion 44 formed between the flange portion 42 and the annular portion 43 and having a diameter smaller than that of the annular portion 43.

Further, the operator attaches the attachment plate 21 to the main body portion 22 with bolts 34. As a result, the mounting plate 21 and the main body 22 are fixed and integrated with each other.
Here, the mounting plate 21 includes a plate-shaped plate main body 51, a pair of mounting pieces 52 protruding from the plate main body 51 in one direction (right direction in the figure), and the plate main body 51 in the other direction (same as the same). A bent portion 53 projecting in the left direction of the figure, and a cutout portion 54 formed by cutting the plate body portion 51 into an inverted U shape and entering the recess 44 of the mounting arm 12. . As shown in FIG. 4, the mounting plate 21 includes a bolt 33 that is screwed into a screw hole (not shown) formed in the plate main body 51. The tip of the screw portion of the bolt 33 is in contact with the main body portion 22 attached to the attachment plate 21 via the bolt 34. When the bolt 33 is rotated by a screwdriver (not shown), the separation distance between the plate main body 51 and the main body 22 of the mounting plate 21 can be changed by the feed screw action.

Then, as shown in the figure, the operator connects the protruding piece 12a of the mounting arm 12 and the eyebolt 22a of the main body 22 with the wire 31, and then attaches the mounting plate 21 by holding the main body 22 in his / her hand. Engage with the arm 12. The reason why the wire 31 is used is to prevent damage or the like due to dropping of the main body 22 during work.
Here, when the plate main body 51 of the mounting plate 21 is engaged with the recess 44 of the mounting arm 12, the main body 22 is held by the mounting arm 12 and the column 11 via the mounting plate 21, although not fixed. The For this reason, the operator can release his / her hand from the main body 22. Then, the operator rotates the mounting arm 12 with respect to the column 11 so that the mounting arm 12 is positioned on the water surface W side with respect to the column 11 (see FIG. 2). After that, the bolts are tightened to fix the mounting arm 12 and the operation / control unit 13 to the column 11.

In this state, the main body 22 is merely engaged with the mounting arm 12 via the mounting plate 21, and the main body 22 is not fixed to the mounting arm 12. Therefore, the main body 22 can change the relative position with respect to the mounting arm 12. More specifically, the attachment plate 21 and the main body 22 can be rotated around the axis of the attachment arm 12.
As shown in FIG. 4, the attachment arm 12 includes a stopper 45 screwed into a screw hole (not shown) formed in the flange portion 42. The stopper 45 is for limiting the range in which the attachment plate 21 and the main body 22 rotate relative to the attachment arm 12 when adjusting the optical axis. The fine adjustment of the optical axis adjustment is performed using adjustment holes 55, 56, 57 provided in the attachment plate 21 and a groove (not shown) provided in the attachment arm 12.

  The adjustment between the mounting plate 21 and the main body 22 will be described. The main body 22 can be rotated with respect to the mounting plate 21 until the bolt 34 is tightened. Therefore, it is possible to change the posture of the main body 22 with respect to the mounting plate 21 by loosening the bolts 34.

Using this action, the operator rotates the main body 22 to adjust the position relative to the water surface W. That is, the main body portion 22 is attached to the attachment arm 12 or the attachment in a state where the reception level of the light receiving portion 400 (see FIGS. 1-1 to 1-3) of the oil film detector E is displayed on the display portion 13b (see FIG. 2). The optical axis is adjusted by rotating with respect to the plate 21.
As shown in FIG. 4, after adjusting the optical axis, the mounting plate 21 is fixed to the main body portion 22 with bolts 34 and is fixed to the mounting arm 12 with four bolts 32. Thereby, as for the oil film detector E, each structural member is assembled as integral. Further, the oil film detector E can detect the oil film on the water surface W. In this way, the oil film detector E is installed at the detection location.

Next, the optical axis adjustment and calibration of the laser beam L3 irradiated from the oil film detector E to the water surface W will be described.
FIG. 5A is a front view illustrating the jig 7, and FIG. 5B is a perspective view illustrating the upper part of the jig 7.
As shown in FIG. 5A, the jig 7 includes a cylindrical upper member 71 located in the upper part, a cylindrical intermediate member 72 located in the middle part, and a lower shape that can be accommodated in the lower part. Side member 73.
Further, the upper member 71, the intermediate member 72, and the lower member 73 that constitute a part of the jig 7 are formed using an opaque member in order to maintain the inside of the jig 7 in a dark state. The target plate 6 is also formed using an opaque member.
The upper member 71, the intermediate member 72, and the lower member 73 are made of a relatively lightweight synthetic resin, and may be formed using, for example, polyvinyl chloride. In addition, by making the jig 7 a light synthetic resin member, it is easy to carry and manage, and contributes to simplifying the mounting structure.

The lower member 73 of the jig 7 has a bottom surface portion 73a, and a container 74 is placed on the bottom surface portion 73a. The container 74 is for generating a detection surface Ws at the time of optical axis adjustment or calibration. That is, when water is put into the container 74, the water surface is generated as the detection surface Ws, and the reflected light L4s (see FIG. 6) reflected by the detection surface Ws is irradiated onto the surface 6b of the target plate 6. By using such reflected light L4s, optical axis adjustment or calibration can be performed. The container 74 is an example of a generating unit, the detection surface Ws is an example of an adjustment calibration detection surface, and the reflected light L4s is an example of adjustment calibration reflected light.
Furthermore, when water and oil are put into the container 74, an oil film is generated on the water surface W as a detection surface. In this way, by forming an arbitrary type of detection surface on the container 74, it is possible to acquire reflectance information in the case of the detection surface. For this reason, it is possible to determine whether the oil film detector E operates normally by operating the oil film detector E using a substance whose reflectance is known in advance.

Each of the upper member 71, the intermediate member 72 and the lower member 73 has a screw coupling portion 75 for screw coupling adjacent members to each other. That is, the upper member 71 and the intermediate member 72 are coupled to each other by the screw coupling portion 75. Further, the intermediate member 72 and the lower member 73 are coupled to each other by a screw coupling portion 75.
The screw coupling portion 75 is configured by forming a male screw (not shown) on any one member and forming a female screw (not shown) on the other member. Therefore, it is possible to easily assemble or disassemble adjacent members.

More specifically, the optical path length between the half mirror 310 or the irradiation unit 200 (see FIGS. 1-1 to 1-3) and the detection surface Ws of the container 74 is changed by changing the length of the intermediate member 72 of the jig 7. Can be changed. In other words, the jig 7 includes the intermediate member 72 and the screw coupling portion 75 for changing the separation distance F between the surface 6 b of the target plate 6 and the detection surface Ws of the container 74. The intermediate member 72 and the screw coupling portion 75 are an example of changing means.
Thus, more appropriate adjustment can be performed by setting the accuracy of the position adjustment to a level corresponding to the distance between the oil film detector E and the water surface W at the place where the oil film detector E is installed. Therefore, by using the intermediate member 72 having a length corresponding to the distance between the oil film detector E and the water surface W, the necessary and sufficient accuracy for position adjustment can be ensured.
In the present embodiment, the polyvinyl chloride intermediate member 72 is used, but other configuration examples such as adopting a bellows-like member (not shown) for the upper member 71 and the lower member 73 are also conceivable. It is done.

The upper member 71 of the jig 7 has an upper end portion 71a formed at the open end. When the jig 7 is attached to the hood 23 of the oil film detector E, the upper member 71 has a holding portion 76 for holding the target plate 6 so that the target plate 6 is positioned in the hood 23. Have. That is, the target plate 6 is not attached to the hood 23 but attached to the oil film detector E via the jig 7. The target plate 6 is an example of a plate member. Details of the target plate 6 will be described later.
In other words, the holding part 76 arranges the target plate 6 at a substantially central position of the upper end part 71 a of the upper member 71. Further, the holding portion 76 arranges the target plate 6 so as to be flush with the upper member 71. More specifically, the target plate 6 is held in a state where it is placed on the holding portion 76, and can be easily removed from the jig 7.

Here, the target plate 6 will be described. The target plate 6 is a plate-like member and is formed in a circular shape. The target plate 6 is made of a relatively lightweight synthetic resin, and may be formed using, for example, polyvinyl chloride.
The target plate 6 includes an opening 61 formed in the center. The opening 61 is a hole through which the laser light L3 passes (see FIG. 6). In the present embodiment, the opening 61 is formed in a circular shape, but other shapes may be considered.
Moreover, the target plate 6 has one surface 6a, the other surface 6b, and an outer peripheral surface 6d as shown in FIG. A plurality of grooves 6c are formed on the surface 6b of the target plate 6 (see FIG. 7B). The groove 6c is a mark used when adjusting the optical axis. In order to reliably detect the oil film on the water surface W, the reflected light L4 must be directed toward the light receiving unit 400 with certainty. For this purpose, the optical axis needs to be adjusted so that the reflected light L4 is incident on the half mirror 310 or the condensing unit 800. Therefore, the groove 6c of the target plate 6 is formed so as to serve as a mark for preventing the reflected light L4 from coming off the half mirror 310 or the condensing unit 800. In the present embodiment, the groove 6c is formed in a circular shape, but it is conceivable to form another shape such as a cross shape. It is conceivable that the groove 6c is formed not only on the surface 6b of the target plate 6 but also on the surface 6a.

The upper member 71 of the jig 7 has an attachment portion 77 for attaching the jig 7 to the hood 23 at the upper end portion 71a. As shown in FIG. 5B, the attachment portion 77 is formed by providing cutout portions 77a at substantially equal intervals along the circumferential direction of the upper end portion 71a. The attachment portion 77 is a portion whose rigidity has been reduced by the notch portion 77a, and thus the attachment portion 77 can be easily deformed.
The upper member 71 includes a window portion 78 for an operator who performs position adjustment work, and a mirror 8 positioned below the window portion 78. The mirror 8 is located obliquely below the surface 6 b of the target plate 6. The mirror 8 is for enabling an operator to visually recognize the scanning locus 91 (see FIG. 7) projected on the surface 6b of the target plate 6. The mirror 8 is an example of a mirror member.

More specifically, the jig 7 includes an upper member 71 that restricts the amount of light (disturbance light) outside the jig 7 that hits the surface 6 b of the target plate 6. Furthermore, the jig 7 includes an intermediate member 72 connected to the upper member 71 in order to reduce the influence of ambient light. That is, the inside 7a of the jig 7 is kept dark.
For this reason, even when the output of the laser light source 100 is low power, the scanning locus 91 (see FIG. 7) displayed on the surface 6b of the target plate 6 can be visually recognized in a bright environment. That is, the position of the oil film detector E can be adjusted and the calibration can be performed without darkening the periphery of the oil film detector E. The upper member 71 is an example of a limiting unit.

Next, position adjustment of the oil film detector E will be described.
6 and 7 are views for explaining position adjustment performed by attaching the jig 7 to the hood 23 of the oil film detector E. FIG. The jig 7 in FIG. 6 is illustrated in a cross section taken along line AA in FIG. FIG. 7A is a perspective view of the target plate 6 viewed from below the hood 23, and FIG. 7B is a bottom view viewed from the arrow B shown in FIG.
As shown in FIG. 6, the jig 7 is fixed to the oil film detector E by attaching a fastener 79 to the attachment portion 77. That is, when the attachment portion 77 is tightened with the fastener 79, the attachment portion 77 is deformed and pressed against the hood 23, and the jig 7 is attached to the hood 23.
As described above, the jig 7 is attached to the hood 23 by tightening the fastener 79, and the jig 7 is removed from the hood 23 by loosening the fastener 79. Therefore, the operator can easily and quickly perform the attaching and detaching operations of the jig 7.

  When the optical axis of the laser beam L3 is adjusted, the target plate 6 is disposed on the inner peripheral surface 23b side of the hood 23. That is, the jig 7 is positioned with respect to the hood 23 by the lower end surface 23 a of the hood 23 coming into contact with the holding portion 76 of the jig 7. Accordingly, the target plate 6 placed on the holding portion 76 of the jig 7 is disposed at a predetermined position in the hood 23.

When the laser beam L3 is scanned with the target plate 6 placed on the hood 23, the laser beam L3 is irradiated downward from the opening 61 of the target plate 6. More specifically, the laser beam L3 passes through the opening 61 of the target plate 6 through the passage formed by the inner peripheral surface 23b of the hood 23 and enters the inside 7a of the jig 7.
Then, when the laser beam L3 is reflected by the detection surface Ws of the container 74, it proceeds to the surface 6b of the target plate 6 as reflected light L4s. The reflected light L4s projects a predetermined scanning locus 91 on the surface 6b of the target plate 6 as shown in FIG.

More specifically, as shown in FIG. 6, the operator looks down at the mirror 8 disposed in the window portion 78 of the jig 7 without looking down and looking into the surface 6 b of the target plate 6 from below. The scanning locus 91 can be visually recognized by the posture. For this reason, as shown in FIG. 7B, the operator attaches the main body 22 of the oil film detector E to the mounting arm 12 or the mounting plate 21 ( Adjustment work can be easily performed with respect to FIG. 2 or FIG.
Specifically, the operator performs adjustment so that the scanning locus 91 is positioned at the center of the opening 61 (see the scanning locus 91 indicated by a broken line in FIG. 7B). At that time, the positions of the plurality of grooves 6c can be used as a guide.

In addition, when the scanning trajectory 91 is located at the center of the opening 61, the laser beam L4 passes through the opening 61 as shown in FIG. 7B, so that the scanning trajectory 91 is not reflected. However, since a part of the scanning locus 91 is projected around the opening 61, the adjustment work can be easily performed. In the present embodiment, a cross shape is shown as an example of the scanning trajectory 91, but there are cases where the shape is a petal shape or a round shape.
In this way, optical axis adjustment for directing the reflected light L4 toward the light receiving unit 400 while viewing the scanning locus 91 of the reflected light L4s reflected by the detection surface Ws of the container 74 in a state where the laser light L3 is scanned. Can be easily performed.

  Here, the optical axis adjustment of the laser beam L3 is performed in the process of manufacturing the oil film detector E. More specifically, the oil film detector E includes an adjustment mechanism (not shown) in the main body 22 that adjusts the emission direction of the laser light source 100. Then, when the oil film detector E is assembled, the emission direction of the laser light source 100 is adjusted by an adjustment mechanism (not shown) (adjustment on the light source side, internal optical axis adjustment).

Moreover, the optical axis adjustment of the laser beam L3 is performed, for example, when the oil film detector E is installed on the revetment or during periodic inspection. That is, the optical axis adjustment in this case is mainly the position adjustment (external optical axis adjustment) of the main body 22 of the oil film detector E with respect to the mounting arm 12 or the mounting plate 21 (see FIG. 2 or FIG. 4). And such an external optical axis adjustment is not always performed at the time of the operation | movement of the oil film detector E, but the frequency is low. Therefore, it is preferable to provide an attachment structure for attaching the target plate 6 and the jig 7 only on the jig 7 side, not on the hood 23. Further, it is desirable that the mounting structure is simple.
More specifically, the diameter of the inner peripheral surface 23b of the hood 23 is not manufactured with high accuracy, and is different for each oil film detector E. Therefore, the mounting structure needs to be able to cope with variations in the dimensions of the hood 23. In view of such circumstances, in the present embodiment, the jig 7 has a structure in which the fastener 79 is attached to the attachment portion 77.

Next, calibration of the oil film detector E will be described. Such calibration is performed after adjusting the optical axis.
FIG. 8 is a diagram for explaining calibration performed by attaching the jig 7 to the hood 23 of the oil film detector E. FIG.
As shown in FIG. 8, the target plate 6 is not disposed in the hood 23 during calibration. Therefore, all of the laser beam L4s reflected by the reflecting surface Ws of the laser beam L3 enters the light receiving unit 400 (see FIGS. 1-1 to 1-3). Further, at the time of this calibration, the mirror 8 is not visually recognized from the window portion 78.
The oil film detector E obtains a correlation between the light intensity and the reflectance in advance, and calculates the reflectance of the foreign matter on the detection surface W from the light intensity at the time of measurement based on this correlation. Then, the oil film detector E determines whether or not the calculated reflectance is larger than a predetermined threshold value, and performs a predetermined notification if it is determined to be large. The oil film detector E is calibrated in order to obtain correlation data used to calculate the reflectance of the foreign matter.

DESCRIPTION OF SYMBOLS 12 ... Mounting arm, 21 ... Mounting plate, 22 ... Main body part, 23 ... Hood, 6 ... Target board, 6a, 6b ... Surface, 61 ... Opening part, 7 ... Jig, 71 ... Upper member, 72 ... Intermediate member, 73 ... Lower member, 74 ... Container, 75 ... Screw coupling part, 76 ... Holding part, 77 ... Mounting part, 78 ... Window part, 79 ... Fastener, 8 ... Mirror, 91 ... Scanning locus, E1, E2, E3 ... oil film detector, F ... separation distance, L4s ... reflected light, Ws ... detection surface

Claims (5)

An optical system configured such that parallel light having a predetermined irradiation range is directed to the detection surface and reflected light reflected by the detection surface is directed to the light receiving unit;
Position adjusting means for adjusting the position of the optical system with respect to the detection surface;
Detection means for detecting the state of the detection surface based on the reflected light of the optical system;
A cylindrical member that forms a passage through which the parallel light and the reflected light of the optical system pass;
A jig used for adjustment by the position adjustment means and / or calibration of the detection means, and a position adjustment with the adjustment;
With
The said jig | tool has a production | generation part for producing | generating the adjustment calibration detection surface for the said adjustment and / or the said calibration, The detector characterized by the above-mentioned. A plate-shaped member having an opening through which the parallel light and the reflected light of the optical system pass, and disposed at a position that blocks the passage formed by the cylindrical member;
The jig is detachably attached to the cylindrical member,
The jig receives light so that light outside the jig does not strike the surface of the plate-like member on which the locus of reflected light for adjustment calibration reflected on the adjustment calibration detection surface of the generator is reflected. The detector according to claim 1, further comprising a limiting unit that limits The jig is
A holding portion for holding the plate-like member;
A window portion that allows the restriction portion and the outside of the jig to communicate with each other;
A mirror member which is located in the window portion and makes the locus of reflected light for adjustment and calibration reflected on the surface of the plate-like member visible from the outside of the jig through the window portion;
The detector according to claim 2, further comprising:   The said jig | tool further has a change means to change the separation distance of the said optical system and the said production | generation part of the said jig | tool to the predetermined value, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The detector described. An optical system configured such that parallel light having a predetermined irradiation range is directed to the detection surface and reflected light reflected by the detection surface is directed to the light receiving unit, and a position for adjusting the position of the optical system with respect to the detection surface Adjusting means; detection means for detecting the state of the detection surface based on the reflected light of the optical system; and a cylindrical member forming a path through which the parallel light and the reflected light of the optical system pass. A jig that is attached to the detector and used for adjustment by the position adjustment means and / or calibration of the detection means,
A jig characterized by having a generation unit that is position-adjusted together with the adjustment and generates an adjustment calibration detection surface for the adjustment and / or the calibration.

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