JP2011117857A - Device and method for detecting oil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly detect oil in an extremely narrow waterway. <P>SOLUTION: An oil detecting device 1 includes: an ASK modulation circuit 11 for emitting light having a predetermined wavelength modulated by a predetermined pattern; a projection part 13 having an LD drive circuit 12 and an LD 19; a line lens 20 for linearly shaping the light emitted from the projection part 13; a fluorescence detection part 14 for detecting light having a wavelength different from that of the light emitted from the projection part 13 and modulated by the predetermined pattern, a resonance/high-frequency amplifying circuit 15; a detection circuit 16, a fluorescence filter 21; a tone decoder circuit 18 for outputting that the light is detected by the fluorescence detection part 14 as an oil detection result; and an LD control & signal operation part 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil detection device and an oil detection method.

  Oil spills into rivers and seas can cause serious adverse effects on the natural environment and should be closely monitored. In order to monitor such an oil spill, for example, Patent Document 1 discloses an oil detection device that mainly detects oil floating on the sea surface. For example, Patent Document 2 discloses an oil detection device that detects oil floating mainly in rivers and lakes.

  In each of the oil detection devices of Patent Literatures 1 and 2, oil floating on the water surface is detected by detecting fluorescence emitted by the oil by absorbing light irradiated on the water surface from a light source.

JP 2000-275135 A JP 2002-214140 A

  The conventional oil detection apparatus described above detects oil that has flowed out to the sea surface, rivers, lakes, or the like. On the other hand, there is a desire to detect oil that may flow out of the building inside the building and prevent oil from flowing out of the building.

  For example, a large number of transformers are used in a power plant or substation of a power company. In many of these transformers, mineral oils such as polycyclic aromatic hydrocarbons are used as insulating oils. If fine holes or cracks occur due to rust or the like in the transformer casing, part of the insulating oil may flow out.

  Therefore, it is extremely useful to detect oil that may flow out to the outside (rivers and seas) in the drainage pits in such power plants or substations and to prevent the oil from flowing out to the outside. .

  However, in response to such demands, all of the conventional oil detection devices described above are intended for vast water areas such as the sea surface, rivers, and lakes, and the conventional oil detection device is similar to the drainage pit described above. It is difficult to apply to very narrow waterways.

  The present invention has been made under such a background, and an object thereof is to provide an oil detection device and an oil detection method capable of reliably detecting oil in a very narrow water channel.

  One aspect of the present invention is an oil detection apparatus. That is, the oil detection device of the present invention includes a light projecting unit that irradiates light of a predetermined wavelength modulated by a predetermined pattern, an irradiation area shaping unit that shapes light emitted from the light projecting unit into a linear shape, A light receiving unit that receives light having a wavelength different from the wavelength of light emitted from the light projecting unit and modulated according to a predetermined pattern, and an output unit that outputs that the light receiving unit has received light as an oil detection result Is.

  Furthermore, a swing mechanism unit that swings the light projecting unit so that the irradiation region of the linear light irradiated by the irradiation region shaping means reciprocates in a direction orthogonal to the irradiation region of the linear light. Can have.

  Furthermore, it is possible to have wavelength changing means that can change the wavelength of light emitted by the light projecting unit and the wavelength of light received by the light receiving unit.

  The predetermined pattern is a signal of 20 Hz to 20 kHz, and the output unit can output an audible sound of 20 Hz to 20 kHz obtained by demodulating light modulated by the signal of the predetermined pattern.

  Another aspect of the present invention is an oil detection method. That is, the oil detection method of the present invention is an oil detection method performed by an oil detection device that detects oil floating on the water surface, and the light projecting unit irradiates light having a predetermined wavelength modulated by a predetermined pattern. The irradiation area shaping means executes a step of shaping the light emitted from the light projecting unit into a linear shape, and the light receiving unit has a wavelength different from the wavelength of the light emitted from the light projecting unit. A step of receiving light modulated by a predetermined pattern is executed, and an output unit executes a step of outputting the fact that the light receiving unit has received light as an oil detection result.

  Further, the swinging mechanism unit swings the light projecting unit so that the linear light irradiation region irradiated by the irradiation region shaping means reciprocates in a direction perpendicular to the linear light irradiation region. A swing step can be performed.

  Furthermore, the wavelength changing unit can execute a wavelength changing step that can change the wavelength of the light emitted by the light projecting unit and the wavelength of the light received by the light receiving unit.

  The predetermined pattern is a signal from 20 Hz to 20 kHz, and the output unit outputs an audible sound from 20 Hz to 20 kHz obtained by demodulating light modulated by the signal of the predetermined pattern, thereby obtaining an oil detection result. An output step can be executed.

  According to the present invention, oil can be reliably detected in a very narrow water channel.

It is a block block diagram of the oil detection apparatus which concerns on 1st embodiment of this invention. FIG. 2 is a diagram for explaining an ASK-modulated laser diode (LD) drive signal output from the ASK modulation circuit of FIG. 1. It is a figure for demonstrating the line lens of FIG. It is a figure which shows the wavelength of the excitation light irradiated to oil, and the wavelength of the fluorescence light which oil absorbs this excitation light and emits. It is a figure which shows the state by which the light projection part and fluorescence detection part of FIG. 1 are arrange | positioned on the water channel of a drainage pit. It is a figure which shows the swing mechanism part of the light projection part which concerns on 2nd embodiment of this invention. It is a block block diagram of the oil detection apparatus which concerns on 3rd embodiment of this invention. It is a block block diagram of the oil detection apparatus which concerns on 4th embodiment of this invention. It is a figure which shows the usage pattern of the oil detection apparatus of FIG.

(About the oil detection apparatus 1 which concerns on 1st embodiment of this invention)
The configuration of the oil detection device 1 according to the first embodiment of the present invention will be described with reference to FIG. The oil detection device 1 includes a laser diode (hereinafter referred to as LD) control & signal calculation unit 10, an ASK (Amplitude Shift Keying) modulation circuit 11, an LD drive circuit 12, a light projecting unit 13, a fluorescence detection unit 14, a resonance / high frequency It has an amplifier circuit 15, a detector circuit 16, a low frequency amplifier circuit 17, and a tone decoder circuit 18. Further, the light projecting unit 13 includes an LD 19 and a line lens (irradiation area shaping means in the claims) 20. Further, the fluorescence detection unit 14 includes a fluorescence filter 21.

  The LD control & signal calculation unit 10 includes, for example, a CPU (Central Processing Unit), a memory, an input / output port, and the like. Instead of the CPU, an ASIC (Application Specific Integrated Circuit), a microprocessor (microcomputer), a DSP (Digital Signal Processor), or the like may be used. The LD control & signal calculation unit 10 receives an operation input from the user and activates an oil detection process in the oil detection device 1. When the oil detection device 1 is activated, the LD control & signal calculation unit 10 generates an ASK modulation signal by controlling an ASK modulation circuit 11 described later.

  The LD control & signal calculation unit 10 outputs the result of oil detection by the oil detection device 1. As this output form, for example, the detection result is displayed as text data, image data, graphic data, or the like on a display device such as a liquid crystal display device or an organic EL (Electro Luminescence) display device. Alternatively, as an output form, text, an image, a figure or the like indicating the detection result is printed on the paper. Alternatively, as a form of output, the detection result is output as audio data to a speaker or headphones (or earphones). The voice data is a message by synthetic voice such as “Oil detected”. Alternatively, the audio data is a simple oscillation sound “Peep”. In the case of this simple oscillating sound, even if an output signal of a tone decoder circuit 18 described later is output as it is, the user can hear it as an oscillating sound of “pea”. Alternatively, the LD control & signal calculation unit 10 may notify that the oil detection device 1 has detected oil by turning on or blinking a lamp such as an LED (Light Emitting Diode).

  The ASK modulation circuit 11 outputs an ASK-modulated LD drive signal to the subsequent LD drive circuit 12. As shown in FIG. 2, the ASK modulation circuit 11 includes an oscillator 30 and a modulator 31. The oscillator 30 oscillates a sine wave signal of 500 kHz, for example, as a carrier wave. As shown in FIG. 2, the modulator 31 modulates the carrier wave oscillated by the oscillator 30 with transmission data which is a signal of 1.953 kHz, for example. As a result, an LD drive signal is output from the modulator 31.

  The frequency of the carrier wave oscillated by the oscillator 30 is assumed to be, for example, 50 kHz to 800 kHz. Moreover, as a frequency of the signal of transmission data, 20 Hz-20 kHz are assumed, for example. Here, the frequency of the carrier wave is 500 kHz and the frequency of the transmission data signal is 1.953 kHz, but each frequency is not limited to this.

  The LD drive circuit 12 drives the LD 19 in the light projecting unit 13 based on the LD drive signal output from the ASK modulation circuit 11. That is, the LD drive circuit 12 drives the LD 19 in the light projecting unit 13 so as to repeat blinking of 500 kHz at a cycle of 1.953 kHz.

  As for the light projection part 13, LD19 is arrange | positioned in a housing | casing. The line lens 20 is attached to the housing of the light projecting unit 30. As shown in FIG. 3, the line lens 20 is an optical lens for collecting the light from the point light source emitted from the LD 19 to obtain a linear irradiation region 24. In the LD drive circuit 12, as shown in FIG. 3, a switching circuit 22 that performs switching by an LD drive signal is provided. The battery 23 is a power source for the oil detection device 1 and also supplies power to the LD 19.

  The fluorescence detection unit 14 is an MPPC (Multi-detector) which is a photodetection element composed of a photomultiplier tube having a high sensitivity or a plurality of avalanche diodes so that even a very weak fluorescence (for example, one photon) can be detected. -Pixel Photon Counter). Furthermore, the fluorescence detection unit 14 includes a fluorescence filter 21 and can selectively receive only fluorescence having a desired wavelength (for example, 436 nm (nanometer)). The fluorescence detector 14 detects fluorescence in the linear irradiation region 24 shown in FIG. However, the detection range of the fluorescence detection unit 14 does not have to be linear, and may be, for example, circular.

  The resonance / high-frequency amplifier circuit 15 amplifies the signal component output from the fluorescence detection unit 14 only to the high-frequency component of 500 kHz. That is, the resonance / high frequency amplifier circuit 15 performs amplification by resonating with a signal component of a 500 kHz carrier wave. As a result, the resonance / high-frequency amplifier circuit 15 can amplify the desired fluorescent component separately from other signal components such as a noise component.

  The detection circuit 16 demodulates a 1.953 kHz signal as transmission data from the signal component of the carrier wave amplified by the resonance / high frequency amplification circuit 15. The detection circuit 16 does not detect (that is, demodulate) other than the 1.953 kHz signal that is transmission data.

  In this way, only the fluorescent light having a desired wavelength (for example, 436 nm) is selectively received by the fluorescent filter 21, and only the fluorescent light having the desired high-frequency component (for example, 500 kHz) is selectively received by the resonance / high-frequency amplifier circuit 15. Amplifying and detecting circuit 16 can selectively extract only fluorescence having a signal of a desired frequency (for example, 1.953 kHz). Therefore, disturbance light other than the desired fluorescence can be removed with triple accuracy.

  The low frequency amplifier circuit 17 amplifies the signal component of the transmission data, which is a 1.953 kHz signal extracted by the detection circuit 16.

  The tone decoder circuit 18 extracts transmission data, which is a 1.953 kHz signal amplified by the low-frequency amplifier circuit 17, as audio data. In general, human audible frequencies are said to be about 20 Hz to 20 kHz. Therefore, when the transmission data of 1.953 kHz is converted into audio data, it becomes the human audible frequency as it is.

  Therefore, as described above, even if the audio data extracted by the tone decoder circuit 18 is output as it is in the LD control & signal calculation unit 10, a human can hear it as an oscillating sound "pea". Therefore, this oscillation sound may be used as a detection result output.

  The light projecting unit in the claims is not simply the light projecting unit 13, but is formed by the cooperation of the LD control & signal calculation unit 10, the ASK modulation circuit 11, the LD drive circuit 12 and the LD 19. In addition, the light receiving unit in the claims is not simply the fluorescence detection unit 14, but the fluorescence detection unit 14, the resonance / high-frequency amplification circuit 15, the detection circuit 16, and the fluorescence filter 21 are formed in cooperation. Or you may include even the low frequency amplifier circuit 17 in the light-receiving part in a claim. Further, the output section referred to in the claims is established by the cooperation of the tone decoder circuit 18 and the LD control & signal calculation section 10. Alternatively, the low frequency amplifier circuit 17 may be included in the output section referred to in the claims.

(About the oil detection operation of the oil detection device 1)
Next, the oil detection operation of the oil detection device 1 will be described with reference to FIGS. As shown in FIGS. 1 and 5, the oil detection device 1 detects oil 41 floating on the water surface 40 of the water flowing through the drain pit 50. The oil 41 is assumed to be a mineral oil such as a polycyclic aromatic hydrocarbon. As shown in FIG. 4, the oil 41 is known to absorb excitation light having a wavelength of about 405 nm and emit fluorescent light having a wavelength of about 436 nm. In FIG. 4, the fluorescence light intensity compared to the excitation light intensity is drawn larger than the actual light intensity for easy understanding.

  As shown in FIGS. 1 and 5, the oil detection device 1 is disposed in the upper part of the drain pit 50. Excitation light is irradiated from the light projecting unit 13 to the linear irradiation region 24 on the water surface 40 of the water flowing through the drain pit 50. The length of the irradiation region 24 is preferably equal to or greater than the lateral width of the drainage pit 50. Thereby, the irradiation area | region 24 can irradiate excitation light without leaking so that the water surface 40 of the water which flows through the drainage pit 50 may be crossed.

  Here, when the oil 41 exists on the water surface, the oil 41 flows on the water surface 40, so that it always crosses the irradiation region 24. Thereby, the oil 41 absorbs the excitation light irradiated from the light projecting unit 13 and emits fluorescence (fluorescence near a wavelength of 436 nm). Only the fluorescence transmitted from the fluorescent filter 21 is captured by the fluorescence detection unit 14. At this time, the fluorescence emitted by the oil 41 is scattered light, and is therefore irradiated at all angles. Therefore, for example, even if the water surface 40 is undulating, at least part of the fluorescence generated from the oil 41 is incident on the fluorescence detection unit 14 (the fluorescence filter 21 thereof). The emitted fluorescence can be captured.

  The fluorescence captured by the fluorescence detection unit 41 is amplified by the resonance / high frequency amplification circuit 15 only when it includes a high frequency component of 500 kHz. The fluorescence containing the high frequency component of 500 kHz amplified by the resonance / high frequency amplifier circuit 15 is detected by the detection circuit 16. At this time, the detection circuit 16 does not detect (extract) signals other than the signal of 1.953 kHz. Thereby, even if it is fluorescence containing a 500 kHz high frequency component, when it is signals other than a signal of 1.953 kHz, the detection by the detection circuit 16 is not performed. Thereby, noise components other than the desired fluorescence from the water surface 40 can be removed. Thus, the desired noise components other than the fluorescence can be removed with high accuracy by the fluorescent filter 21, the resonance / high frequency amplifier circuit 15, and the detection circuit 16.

  The 1.953 kHz signal extracted by the detection circuit 16 is amplified by the low frequency amplification circuit 17. The 1.953 kHz signal amplified by the low frequency amplifier circuit 17 is input to the tone decoder circuit 18 and input to the LD control & signal calculation unit 10 as audio data.

  The LD control & signal calculation unit 10 may output the audio data input from the tone decoder circuit 18 as it is as a result of fluorescence detection, or it may be triggered when the audio data is input from the tone decoder circuit 18. As an example, a display device (not shown) may indicate that oil has been detected. Alternatively, even when voice data is input from the tone decoder circuit 18, a voice message indicating that oil has been detected from the speaker (or headphone or earphone) (such as “oil detected”) is sent. Good. Alternatively, the LD control & signal calculation unit 10 may indicate that the oil detection device 1 has detected oil by turning on or blinking a lamp such as an LED when voice data is input from the tone decoder circuit 18. You may notify.

(About the light projecting unit 13A according to the second embodiment of the present invention)
Next, a light projecting unit 13A according to a second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 6, the light projecting unit 13 </ b> A has a swing mechanism unit 60 that swings the light projecting unit 13 </ b> A so that the linear light irradiation region 24 reciprocates in a direction orthogonal to the irradiation region 24. Have Although a detailed description of the configuration of the swing mechanism unit 60 is omitted, it can be realized by applying a swing mechanism such as a reciprocating mechanism of an automobile wiper or a fan.

  According to this, for example, in the drainage pit 50, the flow velocity of the water surface 40 is remarkably small, and there is oil 41 upstream of the irradiation area 24 by the light projecting unit 13 shown in FIG. 5, but it takes a long time to reach the irradiation area 24. Assuming a case that requires In such a case, as shown in FIG. 6, the light projecting unit 13 </ b> A is excited with respect to a large area of the water surface 40 by placing the light projecting unit 13 </ b> A in a swinging state as compared with the light projecting unit 13. Can be irradiated. Thereby, in the drainage pit 50, even when the flow velocity of the water surface 40 is extremely small, the oil 41 can be quickly detected as compared with the light projecting unit 13. The fluorescence detection unit 14 is disposed so that the entire area where the light projecting unit 13A irradiates the excitation light in the swinging state is included in the detection range of the fluorescence detection unit 14.

(About the oil detection apparatus 1A according to the third embodiment of the present invention)
Next, an oil detection device 1A according to a third embodiment of the present invention will be described with reference to FIG. The oil detection device 1A is partially different from the oil detection device 1. In the following, the same or the same type of members as those of the oil detection device 1 are denoted by the same or same reference numerals (symbols including “A” or “B” added to the same numbers), and the description thereof is omitted or simplified. Mainly different members will be described.

  The oil detection apparatus 1A includes a wavelength table 70 in the LD control & signal calculation unit 10A. In the wavelength table 70, the wavelengths of excitation light and fluorescence corresponding to a plurality of oil types # 1, # 2, and # 3 are recorded. The LD control & signal calculation unit 10A refers to the wavelength table 70, recognizes the wavelengths of excitation light and fluorescence corresponding to the oil types # 1, # 2, and # 3 set by the user, and projects the light projecting unit 13B and fluorescence detection. The wavelength handled by the unit 14A is set. The wavelength changing means in the claims corresponds to the wavelength table 70. Note that the wavelength table 70 may be omitted, and the user may set the numerical values of the excitation light and fluorescence wavelengths in the LD control & signal calculation unit 10A by direct operation input. In this case, the wavelength changing means referred to in the claims is the LD control & signal calculation unit 10A itself.

  The light projecting unit 13B has a plurality of LDs 19a, 19b, and 19c (denoted as a, b, and c in the figure) corresponding to the excitation lights of a plurality of oil types # 1, # 2, and # 3. Then, the LD control & signal calculation unit 10A instructs the light projecting unit 13B to select the LD 19a, 19b, 19c corresponding to which wavelength. The light projecting unit 13B selects the instructed LDs 19a, 19b, and 19c as a light source of excitation light based on an instruction from the LD control & signal calculation unit 10A.

  In addition, as long as excitation light of a several wavelength can be irradiated with one LD19, you may have only single LD19. Alternatively, the light projecting unit 13B has a single LD 19 having a single wavelength, and is provided with a plurality of filters for converting the wavelength of the light of the LD 19, and the plurality of filters are specified by an instruction from the LD control & signal calculation unit 10A. Any one of these filters may be selected and set.

  At this time, any method may be used for selecting and setting one filter from the plurality of filters in the light projecting unit 13B. For example, the filter having a predetermined wavelength may be set at a predetermined position by mechanically moving the filter by a motor or the like.

  In addition, the fluorescence detection unit 14 includes a plurality of fluorescence filters 21d, 21e, and 21f (denoted as d, e, and f in the figure) corresponding to the fluorescence of a plurality of oil types # 1, # 2, and # 3. Then, the LD control & signal calculation unit 10A instructs the fluorescence detection unit 14 to select and set the fluorescence filters 21d, 21e, and 21f for which wavelength. The fluorescence detection unit 14 selects and sets the instructed fluorescence filters 21d, 21e, and 21f based on an instruction from the LD control & signal calculation unit 10A.

  Note that any method may be used for selecting and setting one fluorescent filter 21d, 21e, 21f from the plurality of fluorescent filters 21d, 21e, 21f. For example, the fluorescent filters 21d, 21e, and 21f having predetermined wavelengths may be set at predetermined positions by mechanically moving the fluorescent filters 21d, 21e, and 21f by a motor or the like. Alternatively, a plurality of fluorescent filters 21d, 21e, 21f are each provided with a light receiving portion (not shown), and the set of the plurality of fluorescent filters 21d, 21e, 21f and the light receiving portion (not shown) is electrically switched. The fluorescent filters 21d, 21e, and 21f having predetermined wavelengths may be set.

  In this way, the oil detection device 1A can cope with detection of a plurality of oil types. In the example of the wavelength table 70 of FIG. 7, the uppermost oil type # 1 is a combination of wavelengths of mineral oil called polycyclic aromatic hydrocarbons described in the first embodiment.

(About the oil detection device 1B according to the fourth embodiment of the present invention)
Next, an oil detection device 1B according to a fourth embodiment of the present invention will be described with reference to FIGS. The oil detection device 1B is partially different from the oil detection device 1. Below, the same or the same kind of members as those of the oil detection device 1 are denoted by the same or the same reference numerals, the description thereof will be omitted or simplified, and different members will be mainly described.

  The oil detection device 1B is an example in which the oil detection device 1 is configured as a handy type. In the circuit unit 80, each unit (LD control & signal calculation unit 10, ASK modulation circuit 11, LD driving circuit 12, resonance / high frequency amplification circuit 15, detection circuit 16, low frequency amplification circuit 17, tone decoder shown in FIG. A circuit 18) is provided. As shown in FIG. 9, the light projecting unit 13 and the fluorescence detecting unit 14 are housed in a compact housing 81 that can be held with one hand together with the circuit unit 80. Furthermore, a headphone 82 is connected to the circuit unit 80, and audio data (oscillation sound or the like) as a detection result of the oil 41 is output. That is, the headphones 82 are connected to a circuit corresponding to the LD control & signal calculation unit 10 in the circuit unit 80.

  As shown in FIG. 9, according to the oil detection device 1 </ b> B, the user holds the casing 81 of the oil detection device 1 </ b> B in his hand and irradiates the wall surface 90 with excitation light from the light projecting unit 13. At this time, if the oil 41 is present on the wall surface 90, the oil 41 absorbs excitation light and emits fluorescence. The fluorescence is received by the fluorescence detection unit 14 and output to the headphones 82 as audio data by the circuit unit 80. The user can detect the oil 41 adhering to the wall surface 90 by listening to the sound data output from the headphones 82 with the ear. The detection target may be the water surface 40 instead of the wall surface 90.

  Further, instead of the headphones, the detection result may be output using display on a display or lighting or blinking of an indicator lamp such as an LED.

(Effects according to embodiments of the present invention)
The oil detection device 1 linearly irradiates excitation light having a predetermined wavelength modulated by a predetermined pattern, receives fluorescence having a wavelength different from that of the excitation light and modulated by the predetermined pattern, and By displaying, oil can be detected in a very narrow water channel.

  In particular, by irradiating excitation light linearly, excitation light can be irradiated so as to cross a narrow water channel such as a drain pit. Thereby, oil detection can be reliably performed over the entire width of the water channel, and the oil 41 can be prevented from being overlooked.

  In addition, since fluorescence having a predetermined wavelength and modulated by a predetermined pattern is received, the influence of disturbance light other than the desired fluorescence can be removed.

  Furthermore, by setting the light projecting portion 13A to swing in such a manner as to reciprocate in a direction orthogonal to the linear irradiation region irradiated by the line lens 20, for example, the oil 41 can be quickly discharged even in a channel having a remarkably small flow velocity. Can be detected.

  Further, in the oil detection device 1A, it is possible to cope with a plurality of oil types by making it possible to change the wavelength of the excitation light irradiated by the light projecting unit 13B and the wavelength of the fluorescence received by the fluorescence detection unit 14, respectively. It can meet a wide range of user needs.

  The oil detection device 1B can be carried by the user as a handy type. Thereby, various things can be made into a detection target and it can respond to a user's wide needs.

(About the embodiment using the program)
Also, each part of the oil detection device 1, 1A, 1B (LD control & signal calculation unit 10, 10A, ASK modulation circuit 11, LD drive circuit 12, resonance / high frequency amplification circuit 15, detection circuit 16, low frequency amplification circuit 17, The tone decoder circuit 18) may be constituted by a general-purpose information processing device that operates according to a predetermined program. For example, a general-purpose information processing apparatus has a memory, a CPU, an input / output port, and the like. The CPU of the general-purpose information processing apparatus reads and executes a control program as a predetermined program from a memory or the like. Thereby, the function of each part of oil detection device 1, 1A, 1B is implement | achieved in a general purpose information processing apparatus. As for other functions, functions that can be realized by software can be realized by a general-purpose information processing apparatus and a program. An ASIC, a microprocessor (microcomputer), a DSP, or the like may be used instead of the CPU described above.

  Even if the control program executed by the general-purpose information processing apparatus is stored in the memory or the like of the general-purpose information processing apparatus before shipment of the oil detection apparatuses 1, 1A, 1B, the oil detection apparatus 1, It may be stored in a memory of a general-purpose information processing apparatus after the shipment of 1A and 1B. Further, a part of the control program may be stored in a memory of a general-purpose information processing device after the oil detection devices 1, 1A, 1B are shipped. A control program stored in a memory of a general-purpose information processing device after the oil detection devices 1, 1A, 1B are shipped is installed on a computer-readable recording medium such as a CD-ROM. Even what was downloaded may be installed via transmission media, such as the internet.

  The control program includes not only a program that can be directly executed by a general-purpose information processing apparatus, but also a program that can be executed by being installed on a hard disk or the like. Also included are those that are compressed or encrypted.

  In this way, by realizing the functions of the oil detection devices 1, 1A, 1B with a general-purpose information processing device and program, it becomes possible to flexibly cope with mass production and specification changes (or design changes).

(Other embodiments)
Various modifications can be made to the embodiment of the present invention without departing from the gist thereof. For example, in the above-described embodiment, the light irradiated from the LD 19 is shaped into a linear shape using the line lens 20, but a linear irradiation region can be formed by various methods other than using the line lens 20. . For example, a linear irradiation region can also be formed by arranging a plurality of LDs as an example and providing a slit having an elongated gap on the front surface in the irradiation direction of the LDs arranged as an example.

  For example, in the above-described embodiment, the carrier wave is described as 500 kHz, but the carrier wave can be set in a frequency range of 50 kHz to 800 kHz. Although the transmission data signal has been described as 1.953 kHz, the transmission data signal can be set within a frequency range of 20 Hz to 20 kHz. Further, any other frequency may be used as long as the influence of disturbance light can be removed.

  In the above-described embodiment, an example of ASK modulation has been described. However, the modulation method may be other than ASK modulation. For example, instead of ADK modulation, FSK (Frequency Shift Keying) modulation or PSK (Phase Shift Keying) modulation may be used.

  In the above-described embodiment, the tone decoder circuit 18 has been described as outputting audio data in the human audible frequency range. However, the LD control & signal calculation units 10 and 10A may also be outside the human audible frequency range. Any frequency may be used as long as the presence / absence of the output from the tone decoder circuit 18 can be determined.

  Further, one oil detection device 1, 1A may have a combination of a plurality of light projecting units 13, 13A and a fluorescence detection unit 14. According to this, the set of the light projecting units 13 and 13A and the fluorescence detection unit 14 can be disposed at a plurality of locations on the water channel of the drainage pit 50, and oil detection can be performed at the plurality of locations. In addition, some of the components of the oil detection devices 1 and 1A are shared by the plurality of oil detection devices 1 and 1A, such as a single LD control & signal calculation unit 10 and 10A shared by the plurality of oil detection devices 1 and 1A. You may make it share.

  In addition to the light projecting unit 13A having the swing mechanism unit 60, the light projecting unit has another swing mechanism unit 60 having the irradiation region 24 in a direction orthogonal to the linear irradiation region 24 of the light projecting unit 13A. The position on the water surface 40 where the oil 41 is detected is obtained by arranging the portion 13A and obtaining the intersection position of the two irradiation regions 24 when fluorescence is detected on the two irradiation regions 24 orthogonal to each other. May be. This configuration is useful for specifying the position of the oil 41 on the water surface 40 when the flow velocity of the water surface 40 is extremely small or zero.

DESCRIPTION OF SYMBOLS 1,1A, 1B ... Oil detection apparatus, 10, 10A ... LD control & signal calculating part (a part of light projection part, a part of output part), 13, 13A ... Light projection part, 14, 14A ... Fluorescence detection part (Part of the light receiving unit), 15... Resonance / high frequency amplifier circuit (part of the light receiving unit), 18... Tone decoder circuit (part of the output unit), 20. ... Fluorescent filter (a part of the light receiving part), 60 ... Swing mechanism part, 70 ... Wavelength table (wavelength changing means)

Claims (8)

In the oil detection device that detects oil floating on the water surface,
A light projecting unit that emits light of a predetermined wavelength modulated by a predetermined pattern;
Irradiation area shaping means for shaping light emitted from the light projecting unit into a linear shape;
A light receiving unit that receives light having a wavelength different from that of the light emitted from the light projecting unit and modulated by the predetermined pattern;
An output unit that outputs the fact that the light receiving unit has received light as an oil detection result;
Having
An oil detection device characterized by that. The oil detection device according to claim 1,
A swing mechanism that swings the light projecting section so that the irradiation area of the linear light irradiated by the irradiation area shaping means reciprocates in a direction perpendicular to the irradiation area of the linear light; Have
An oil detection device characterized by that. The oil detection device according to claim 1 or 2,
A wavelength changing unit that can change a wavelength of light emitted by the light projecting unit and a wavelength of light received by the light receiving unit, respectively;
An oil detection device characterized by that. The oil detection device according to any one of claims 1 to 3,
The predetermined pattern is a signal of 20 Hz to 20 kHz, and the output unit detects oil by outputting an audible sound of 20 Hz to 20 kHz obtained by demodulating light modulated by the signal of the predetermined pattern. Output the result,
An oil detection device characterized by that. An oil detection method performed by an oil detection device that detects oil floating on the water surface,
The light projecting unit executes a step of irradiating light of a predetermined wavelength modulated by a predetermined pattern,
The irradiation area shaping means performs a step of shaping the light emitted from the light projecting unit into a linear shape,
The light receiving unit performs a step of receiving light having a wavelength different from the wavelength of the light emitted from the light projecting unit and modulated by the predetermined pattern,
The output unit executes a step of outputting the fact that the light receiving unit has received light as an oil detection result.
An oil detection method characterized by that. The oil detection method according to claim 5,
The swinging mechanism unit swings the light projecting unit so that the irradiation region of the linear light irradiated by the irradiation region shaping means reciprocates in a direction perpendicular to the irradiation region of the linear light. Perform the swing step,
An oil detection method characterized by that. The oil detection method according to claim 5 or 6,
The wavelength changing unit performs a wavelength changing step that enables changing the wavelength of the light emitted by the light projecting unit and the wavelength of the light received by the light receiving unit, respectively.
An oil detection method characterized by that. The oil detection method according to any one of claims 5 to 6,
The predetermined pattern is a signal of 20 Hz to 20 kHz, and the output unit outputs an audible sound of 20 Hz to 20 kHz obtained by demodulating light modulated by the signal of the predetermined pattern. Execute a step to output the result,
An oil detection device characterized by that.

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