JP2017150856A - Measurement device, sensor device, and portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and low cost measurement device for measuring light absorption and light emission.SOLUTION: Provided is a measurement device for measuring a light component of a target wavelength in incident light, comprising: an optical system for extracting a light component of a target wavelength from incident light; an optical sensor unit for detecting the light component extracted by the optical system; a magnet and a coil, of which one is fixed to a housing and other is attached to an optical component included in the optical sensor unit or the optical system; a drive unit for sending a drive current to the coil and driving the optical sensor unit or the optical component, and changing the target wavelength; and a measurement unit for measuring the light component detected by the optical sensor unit. Also provided are a sensor device and a portable terminal.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a measuring device, a sensor device, and a mobile terminal.

  Conventionally, when detecting a component of incident light, the light is separated using an optical device such as a spectroscope and an interferometer, and the light component of the target wavelength is extracted and detected. Further, when such light detection is simply executed, an optical filter such as a bandpass filter that transmits the target wavelength is inserted into the incident light, and the light component of the transmitted light is detected.

  However, detection using an optical filter has been difficult to detect light components of a plurality of target wavelengths. In addition, since optical devices such as a spectroscope and an interferometer change the target wavelength of the light component to be extracted by moving the optical component, the optical component is mounted using a driving device having high positional accuracy and a wide moving range. It was moved. However, since such a driving device is large and expensive, it has been difficult to provide a small measuring device at low cost.

  In the first aspect of the present invention, there is provided a measuring apparatus for measuring an optical component of a target wavelength in incident light, an optical system for extracting the optical component of the target wavelength from incident light, and an optical component extracted by the optical system An optical sensor unit for detecting the optical sensor unit, one of which is fixed to the housing and the other is a magnet and a coil attached to the optical sensor unit or an optical component included in the optical system, and an optical sensor unit that causes a drive current to flow in the coil. Alternatively, a measuring device, a sensor device, and a portable terminal including a driving unit that drives an optical component and changes a target wavelength and a measuring unit that measures a light component detected by the optical sensor unit are provided.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

The structural example of the detection apparatus 10 which concerns on this embodiment is shown. The 1st structural example of the measuring apparatus 100 which concerns on this embodiment is shown. The 2nd structural example of the measuring apparatus 100 which concerns on this embodiment is shown. The 3rd structural example of the measuring apparatus 100 which concerns on this embodiment is shown. The 4th structural example of the measuring apparatus 100 which concerns on this embodiment is shown. The 5th structural example of the measuring apparatus 100 which concerns on this embodiment is shown. The structural example of the portable terminal 300 which concerns on this embodiment is shown.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 shows a configuration example of a detection apparatus 10 according to the present embodiment. The detection device 10 detects the light component of the target wavelength. The detection device 10 includes an optical filter 12 and an optical sensor unit 14. The optical filter 12 transmits the light component of the target wavelength. The optical filter 12 is a band-pass filter as an example. The optical sensor unit 14 detects light that has passed through the optical filter 12. The optical sensor unit 14 may be a photodiode or the like.

  Since such a detection apparatus 10 can detect the light component of the target wavelength included in the incident light, for example, by inserting a measurement target in the path of the incident light and comparing the detection results before and after the insertion The light absorption and light emission of the measurement object can be measured. The measurement object may be a gas, a liquid, a solid, or the like. Further, the measurement object may be identified by measuring light absorption and light emission using the detection device 10.

  As an example, by making the measurement object gas and making the transmission wavelength of the optical filter 12 substantially coincide with the absorption line of one gas component, the detection apparatus 10 determines that the measurement object is one from the measurement result of the light absorption of the measurement object. It is possible to determine whether or not a gas component is included. Moreover, the detection apparatus 10 may further determine the concentration of one gas component from the light absorption amount.

  As described above, the detection apparatus 10 can determine the concentration of the component included in the measurement target by substantially matching the transmission wavelength of the optical filter 12 that transmits a single wavelength with the target wavelength such as a light absorption line. Therefore, the detection apparatus 10 can provide, for example, a small and low-cost gas sensor.

  However, it is difficult to change the transmission wavelength of the optical filter 12, and it is difficult to detect absorption or emission at a wavelength different from the transmission wavelength. Therefore, the detection apparatus 10 could not measure the amount of absorption of a plurality of absorption lines, for example. When measuring such light absorption and light emission of a plurality of target wavelengths, an absorption spectrum is obtained by changing the target wavelength of a light component extracted from incident light using an optical device such as a spectroscope and an interferometer. The emission spectrum was measured.

  Such an optical device such as a spectroscope and an interferometer is equipped with a driving device such as a motor, and the optical component is moved to vary the transmission wavelength of incident light. Therefore, it is desirable that the driving device move the optical component to the extent that an optical spectrum can be obtained while maintaining the positional accuracy of the optical component, and has become a large and expensive device. Therefore, the measurement apparatus 100 according to the present embodiment provides a small-sized and low-cost measurement apparatus provided with a drive unit that moves an optical component over a wide range and is driven with a small size and high positional accuracy. Such a measuring apparatus 100 will be described next.

  FIG. 2 shows a first configuration example of the measuring apparatus 100 according to the present embodiment. The measuring apparatus 100 measures the light component of the target wavelength in the incident light. The measuring apparatus 100 may measure absorption and emission of a plurality of target wavelengths in incident light. The incident light is preferably incident on the measuring apparatus 100 as parallel light. The measuring apparatus 100 includes an optical system 110, an optical sensor unit 120, a magnet 130, a coil 140, a magnetic sensor 150, a driving unit 160, and a measuring unit 170.

  The optical system 110 extracts a light component having a target wavelength from incident light. The optical system 110 makes the target wavelength of the light component to be extracted variable. The optical system 110 may include an interferometer, a spectroscope, a variable wavelength filter, or the like. FIG. 2 shows an example in which the optical system 110 has a Michelson interferometer. The optical system 110 includes a beam splitter 112, a first mirror 114, and a second mirror 116.

  The beam splitter 112 transmits a part of incident light and reflects a part thereof. The beam splitter 112 may be a half mirror. The beam splitter 112 transmits a part of the incident light in a direction substantially the same as the traveling direction of the incident light, and reflects a part of the incident light in a direction substantially perpendicular to the traveling direction of the incident light. FIG. 2 shows an example in which the beam splitter 112 transmits a part of incident light incident in the −X direction in the −X direction and reflects the remaining part of the incident light in the + Y direction.

  The first mirror 114 reflects the light transmitted through the beam splitter 112 in the direction of the beam splitter 112. The second mirror 116 reflects the light reflected by the beam splitter 112 in the direction of the beam splitter 112. In FIG. 2, the light transmitted by the beam splitter 112 in the −X direction is reflected by the first mirror 114 in the + X direction, and the light reflected by the beam splitter 112 in the + Y direction is reflected by the second mirror 116 in the −Y direction. An example is shown.

  As described above, the optical system 110 branches the incident light in two directions, combines the branched light again, and emits the light in substantially the same direction. As a result, the optical system 110 synthesizes and interferes with the light traveling in two different optical paths. In other words, the optical system 110 generates an optical path difference between the two optical paths according to the arrangement of the first mirror 114 and the second mirror 116, and the intensity of the light that causes the optical path difference to be an even multiple of 0 and half of the wavelength. The light intensity is increased and the light intensity at which the optical path difference is an odd multiple of half the wavelength is decreased. As a result, the optical system 110 extracts the light component of the target wavelength by adjusting the positions of the first mirror 114 and the second mirror 116.

  The optical sensor unit 120 detects the light component extracted by the optical system. The optical sensor unit 120 receives light emitted from the optical system 110. That is, in the optical sensor unit 120, the light reflected by the first mirror 114 and emitted through the beam splitter 112 and the light reflected by the second mirror 116 and emitted through the beam splitter 112 are incident. The optical sensor unit 120 may be a semiconductor photodetector such as a photodiode and a photoconductive cell. Alternatively, the photosensor unit 120 may be a pyroelectric detector.

  One of the magnet 130 and the coil 140 is fixed to the housing of the measurement apparatus 100, and the other is attached to an optical component included in the optical system 110. That is, one of the magnet 130 and the coil 140 is attached to the first mirror 114 or the second mirror 116 as an optical component. The magnet 130 may be a permanent magnet. The coil 140 generates a magnetic field that attracts or repels the magnet 130 when a current flows. Thereby, the coil 140 may move the magnet 130 together with the optical components.

  FIG. 2 shows an example in which the magnet 130 is attached to the first mirror 114 and the coil 140 is fixed to the housing. In this case, the coil 140 moves the first mirror 114 according to the current flowing. That is, FIG. 2 shows an example in which the first mirror 114 is a moving mirror and the second mirror 116 is a fixed mirror. In the example of FIG. 2, the coil 140 moves the first mirror 114 substantially parallel to the X direction.

  The magnetic sensor 150 is provided at a position fixed with respect to the coil 140 and detects the strength of the magnetic field of the magnet 130. That is, the magnetic sensor 150 detects the magnetic field of the magnet 130 that is moved by the coil 140. That is, the magnetic sensor 150 detects the strength of the magnetic field according to the position of the magnet 130. The magnetic sensor 150 includes a Hall element, a magnetoresistive element (MR), a giant magnetoresistive element (GMR), a tunnel effect magnetoresistive element (TMR), a magneto-impedance element (MI element) GMR (Giant Magneto Resistive) element, and / or An inductance sensor or the like may be included.

  The driving unit 160 drives the optical component by passing a driving current through the coil 140 to change the target wavelength of the light component extracted by the optical system 110. That is, the drive unit 160 moves the first mirror 114 to adjust the optical path difference between the two lights branched in the optical system 110. Further, the drive unit 160 specifies the position of the optical component using the strength of the magnetic field detected by the magnetic sensor 150. That is, the drive unit 160 specifies the position of the first mirror 114 according to the strength of the magnetic field corresponding to the position of the magnet 130, and moves the first mirror 114 based on the specified position. Thus, since the measuring apparatus 100 according to the present embodiment combines the driving magnet and the position detection magnet with one magnet, the number of members can be reduced and the size can be reduced. Magnetization is preferably a dipole magnet or a quadrupole magnet, but other magnets may be used.

  Thereby, the drive part 160 can feedback-control so that the position of the 1st mirror 114 may be moved to a predetermined position, and can position the 1st mirror 114 accurately. Thereby, the drive unit 160 can substantially match the target wavelength of the light component extracted by the optical system 110 with the absorption line or the like of the measurement target. In addition to this, the drive unit 160 may move the first mirror 114 from a predetermined first position to a second position. Accordingly, the driving unit 160 can sweep the target wavelength of the light component extracted by the optical system 110.

  The measurement unit 170 measures the light component detected by the optical sensor unit 120. The measurement unit 170 measures the optical spectrum of the light incident on the optical system 110 by, for example, Fourier transforming the detection results of the optical sensor unit 120 for a plurality of positions of the first mirror 114. The measurement unit 170 calculates a ratio for each wavelength between the optical spectrum of the incident light and the optical spectrum measured when the measurement target is inserted in the path of the incident light, thereby measuring the light absorption (transmission) spectrum of the measurement target. May be measured.

  The measurement unit 170 may specify a component included in the measurement target from the presence / absence of absorption corresponding to an absorption line unique to the substance and the amount of absorption. Moreover, since the measurement part 170 can measure the light transmission spectrum of the band which swept the object wavelength, it can measure the amount of absorption corresponding to a plurality of absorption lines and the like. That is, the measurement unit 170 may specify a plurality of components included in the measurement target. Note that the optical spectrum in the initial state before the measurement object is inserted may be measured in advance and stored in a storage unit or the like. Alternatively, light on a path that does not pass through the measurement target may be used as a measurement reference. In this case, the measuring apparatus 100 may further include an optical sensor unit for reference measurement in addition to the optical sensor unit 120 that measures light passing through the measurement object. Instead of this, the measurement apparatus 100 may move the optical sensor unit 120 in the case of reference measurement. Further, the background may be obtained by software processing.

  Thereby, the measurement part 170 can be located in the area | region through which the optical component of incident light passes as an example, and can measure the component of the measuring object which permeate | transmits a part of the said optical component. Note that the measurement target may include outside air outside the measurement apparatus 100. In this case, the optical system 110 may extract a light component from incident light that has passed through the outside air, and the measurement unit 170 may measure a target gas component in the outside air using the light component. Instead of or in addition to this, the measurement object may include a gas inside the measurement apparatus 100. In this case, the measurement target may include a gas in a region between the optical system 110 and the optical sensor unit 120. Moreover, the measuring device 100 may take outside air into the measuring device 100 and measure the outside air.

  As described above, the measuring apparatus 100 according to the present embodiment moves the first mirror 114, which is an optical component, using the magnet 130 and the coil 140, and thereby transmits a light transmission spectrum in a wavelength band corresponding to the moved distance. Can be measured. Such magnets 130 and coils 140 can be made smaller compared to the size of the optical components, and smaller drive devices can be formed compared to motors, power cylinders, linear actuators, and the like. Further, if the magnetic sensor 150 and the driving unit 160 are integrated as the same IC, the size can be further reduced. Here, the drive unit 160 may include a control unit that performs PID control and a driver that drives a coil.

  The combination of the magnet 130 and the coil 140 can make the movable range of the optical component about several hundred μm or more. A plurality of magnets 130 and coils 140 may be provided, and in this case, the movable range of the optical component can be further widened. Moreover, since the measuring apparatus 100 can feedback-control the movement of such optical components using the magnetic sensor 150, the position accuracy can be reduced to about several μm or less. Therefore, according to the measuring apparatus 100 according to the present embodiment, it is possible to measure light components of a plurality of target wavelengths with a small size and low cost.

  The measurement apparatus 100 according to this embodiment described above has been described using the magnet 130 and the coil 140 to move the first mirror 114. Instead of this, the measuring apparatus 100 may move the second mirror 116 using the magnet 130 and the coil 140. That is, the first mirror 114 may be a fixed mirror and the second mirror 116 may be a movable mirror. In this case, the coil 140 is disposed in the vicinity of the second mirror 116 and moves the second mirror 116 in the Y direction. And move it approximately parallel.

  In addition to the movement of the first mirror 114, the measuring apparatus 100 may further move the second mirror 116. That is, each of the first mirror 114 and the second mirror 116 may be a movable mirror. In this case, in addition to the magnet 130 and the coil 140 corresponding to the first mirror 114, the measuring device 100 moves the second magnet fixed to the second mirror 116 and the second magnet 116 together with the second mirror 116. A coil may be provided. The measuring apparatus 100 may further include a second magnetic sensor that detects a magnetic field according to the position of the second mirror 116.

  Since the magnet 130, the coil 140, and the magnetic sensor 150 can be formed in a small size, the measuring apparatus 100 is provided with each corresponding to a plurality of optical components, and each of the plurality of optical components can be moved. Good. For example, the measurement apparatus 100 can improve the sweep width and sweep speed of the target wavelength by making the first mirror 114 and the second mirror 116 movable. In addition, when one movable mirror breaks down, the life of the apparatus can be extended by moving the other movable mirror.

  The optical component such as a mirror may be provided so as to be movable in a predetermined direction using a ball guide, a shaft, a spring, and the like. Further, the magnet may be configured to have a holding force of the optical member by using a back yoke. Further, the mirror may have a concave surface and a convex surface, and may have a curved and focused shape as well as a flat surface.

  FIG. 3 shows a second configuration example of the measuring apparatus 100 according to the present embodiment. In the measurement apparatus 100 of the second configuration example shown in FIG. 3, the same reference numerals are given to substantially the same operations as those of the measurement apparatus 100 according to the present embodiment shown in FIG. 2, and description thereof is omitted. The measuring apparatus 100 of the second configuration example shows an example in which the magnet 130 is fixed to the housing and the coil 140 is attached to the first mirror 114.

  In this case, the magnet 130 may be an electromagnet in which a coil is wound around a core made of a magnetic material or the like and a magnetic field is generated by passing a current through the coil. The driving unit 160 attracts the coil 140 and moves the first mirror 114 by supplying a current to the magnet 130. The measuring apparatus 100 may include a plurality of such magnets 130, and the driving unit 160 may change the currents supplied to the plurality of magnets 130 and move the first mirror 114. In this case, the measuring apparatus 100 may include a yoke instead of or in addition to the coil 140.

  Instead, the driving unit 160 may supply current to the coil 140 attached to the first mirror 114, and move the first mirror 114 by attracting or repelling the magnet 130 fixed to the housing. . Similarly, the drive unit 160 may move the second mirror 116.

  The measuring apparatus 100 of the second configuration example further includes a position detection magnet 210 attached to the optical component. In this case, the magnetic sensor 150 is fixed to the housing of the measuring apparatus 100. The drive unit 160 specifies the position of the optical component using the strength of the magnetic field detected by the magnetic sensor 150 and generated by the position detection magnet 210.

  Instead of this, in the measuring apparatus 100 of the second configuration example, the magnetic sensor 150 may be attached to the optical component, and the position detection magnet 210 may be fixed to the housing of the measuring apparatus. Even in this case, the driving unit 160 can specify the position of the optical component using the strength of the magnetic field detected by the magnetic sensor 150 and generated by the position detection magnet 210.

  FIG. 4 shows a third configuration example of the measuring apparatus 100 according to the present embodiment. In the measurement apparatus 100 of the third configuration example shown in FIG. 4, the same reference numerals are given to substantially the same operations as those of the measurement apparatus 100 according to the present embodiment shown in FIGS. 2 and 3, and the description thereof is omitted. .

  The measuring apparatus 100 of the third configuration example shows an example in which the magnet 130 is attached to the first mirror 114 and the coil 140 is fixed to the casing. The operations of the magnet 130 and the coil 140 in this case are substantially the same as the operations described in FIG. The measuring apparatus 100 of the third configuration example further includes a position detection magnet 210 attached to the optical component. The magnetic sensor 150 is fixed to the housing of the measuring apparatus 100. The drive unit 160 specifies the position of the optical component using the strength of the magnetic field detected by the magnetic sensor 150 and generated by the position detection magnet 210. As in the measurement apparatus 100 shown in the second configuration example and the third configuration example above, the magnet used when moving the optical component and the magnet used when specifying the position of the optical component are provided separately and independently. It's okay.

  The measurement apparatus 100 according to the present embodiment described above has been described using the magnet 130 and the coil 140 to move the first mirror 114 and / or the second mirror 116. In addition to this, the measuring apparatus 100 may move the optical sensor unit 120. The measuring apparatus 100 may further include a third magnet and a third coil, and one of the third magnet and the third coil may be fixed to the housing of the measuring apparatus 100 and the other may be attached to the optical sensor unit 120.

  For example, the measuring apparatus 100 may make the optical sensor unit 120 movable in a direction substantially parallel to the Y direction. For example, the measurement apparatus 100 measures the first optical spectrum at the first distance in which the driving unit 160 moves the optical sensor unit 120 in the + Y direction to bring the distance between the optical system 110 and the optical sensor unit 120 closer. . Then, the measuring apparatus 100 measures the second optical spectrum at the second distance in which the driving unit 160 moves the optical sensor unit 120 in the −Y direction to separate the distance between the optical system 110 and the optical sensor unit 120. To do.

  Thus, since the measuring apparatus 100 changes the distance between the optical system 110 and the optical sensor unit 120, the distance by which the light component emitted from the optical system 110 passes through the measurement target can be changed. That is, the gas between the optical system 110 and the optical sensor unit 120 can be a measurement target. Therefore, for example, by calculating the ratio of the second spectrum for each wavelength with respect to the first spectrum, the absorption spectrum in which the light component is absorbed by the measurement object can be measured at the difference between the first distance and the second distance. .

  FIG. 5 shows a fourth configuration example of the measuring apparatus 100 according to the present embodiment. In the measurement apparatus 100 of the fourth configuration example shown in FIG. 5, the same reference numerals are given to substantially the same operations as those of the measurement apparatus 100 according to the present embodiment shown in FIG. 2, and description thereof is omitted. In the measurement apparatus 100 of the fourth configuration example, the optical system 110 includes a spectral prism 220 as an optical component. The spectral prism 220 is provided between the incident light input unit and the optical sensor unit 120 so that the incident light passes through the spectral prism 220 before being received by the optical sensor unit 120.

  The spectral prism 220 emits an optical spectrum by wavelength-dispersing incident light. That is, the spectroscopic prism 220 refracts incident light in a direction corresponding to the wavelength and emits it. Therefore, by arranging the optical sensor unit 120 in the refraction direction corresponding to the target wavelength, the optical sensor unit 120 can receive the light component of the target wavelength. Further, by moving the spectral prism 220 so that the refraction directions of the plurality of target wavelengths are directed toward the optical sensor unit 120, the optical sensor unit 120 causes the light components of the plurality of target wavelengths to move along with the movement of the spectral prism 220. Can receive light.

  Therefore, in the measurement apparatus 100 of the fourth configuration example, one of the magnet 130 and the coil 140 is fixed to the housing of the measurement apparatus 100 and the other is attached to the spectroscopic prism 220. Then, the drive unit 160 drives the spectral prism 220, which is an optical component, by passing a drive current through the coil 140 to change the target wavelength. The drive unit 160 moves the spectroscopic prism 220 so as to change the incident angle of the incident light with respect to the spectroscopic prism 220. For example, when incident light is incident in the −Y direction on the XY plane, the driving unit 160 rotates the spectroscopic prism 220 about the Z direction substantially perpendicular to the XY plane.

  FIG. 5 shows an example in which the magnet 130 is attached to the spectroscopic prism 220 and the coil 140 is fixed to the housing of the measuring apparatus 100. As described with reference to FIG. 2, the measuring apparatus 100 may be provided with a magnetic sensor 150 provided at a position fixed with respect to the coil 140. In this case, the driving unit 160 detects the magnetic field detected by the magnetic sensor 150. The position of the spectroscopic prism 220 may be specified using the intensity of. In addition, the driving unit 160 may perform feedback control on the position of the spectroscopic prism 220 using the position of the spectroscopic prism 220 thus identified.

  In the measurement apparatus 100 according to this embodiment, as described with reference to FIGS. 3 and 4, the coil 140 may be attached to the spectroscopic prism 220 and the magnet 130 may be fixed, and the position detection magnet 210 may be further provided. It may be provided.

  Although the measuring apparatus 100 in this embodiment demonstrated the example which moves the spectral prism 220 and changes an object wavelength, it may replace with this and may move the optical sensor part 120. FIG. Since the spectroscopic prism 220 refracts the incident light in the direction corresponding to the wavelength and emits it, the optical sensor unit 120 is arranged at a position corresponding to the target wavelength, so that the optical sensor unit 120 has the light component of the target wavelength. Can be received. Therefore, if the optical sensor unit 120 is moved to a plurality of positions corresponding to a plurality of target wavelengths, the optical sensor unit 120 can receive light components of the plurality of target wavelengths as they move.

  Therefore, the measurement apparatus 100 may fix one of the magnet 130 and the coil 140 to the housing of the measurement apparatus 100 and attach the other to the optical sensor unit 120. Then, the driving unit 160 drives the optical sensor unit 120 by passing a driving current through the coil 140 to change the target wavelength. In this case, the magnetic sensor 150 detects the magnetic field of the magnet 130 or the position detection magnet 210 attached to the optical sensor unit 120, and the driving unit 160 uses the intensity of the magnetic field detected by the magnetic sensor 150 to perform light The position of the sensor unit 120 may be specified.

  Moreover, the measuring apparatus 100 may move the spectroscopic prism 220 and the optical sensor unit 120, respectively. As described above, the measurement apparatus 100 of the fourth configuration example can measure the optical spectrum by moving the spectroscopic prism 220 and / or the optical sensor unit 120 using the magnet 130 and the coil 140, and therefore, FIG. As described above, the light transmission spectrum of the measurement object can also be measured. That is, according to the measurement apparatus 100 according to the present embodiment, it is possible to measure light components of a plurality of target wavelengths with a small size and low cost.

  FIG. 6 shows a fifth configuration example of the measuring apparatus 100 according to the present embodiment. In the measurement apparatus 100 of the fifth configuration example shown in FIG. 6, the same reference numerals are given to substantially the same operations as those of the measurement apparatus 100 according to the present embodiment shown in FIGS. 2 and 5, and description thereof is omitted. . The measurement apparatus 100 of the fifth configuration example is a Fabry-Perot interferometer in which the optical system 110 includes an etalon 230 as an optical component. The etalon 230 may be provided between the incident light input unit and the etalon 230 so that the incident light passes through the etalon 230 before being received by the optical sensor unit 120.

  The etalon 230 is a wavelength filter having two opposing reflecting surfaces that cause multiple interference of incident light, and having a periodic transmission peak corresponding to the optical path difference between the two reflecting surfaces. Therefore, the etalon 230 becomes a wavelength filter that transmits a wavelength corresponding to the interval between two opposing reflecting surfaces. Further, since the optical path difference of the incident light with respect to the two reflecting surfaces changes according to the angle at which the incident light enters the two reflecting surfaces of the etalon 230, the transmission wavelength of the etalon 230 depends on the incident angle. Will change.

  Therefore, the measurement apparatus 100 can adjust the angle of the etalon 230 with respect to the incident light, so that the transmission wavelength of the etalon 230 can be substantially matched with the target wavelength, and the optical sensor unit 120 receives the light component of the target wavelength. it can. In addition, the measurement apparatus 100 moves the etalon 230 so that the transmission wavelength of the etalon 230 matches the plurality of target wavelengths, so that the optical sensor unit 120 causes the light components of the plurality of target wavelengths to move along with the movement of the etalon 230. Can receive light.

  Therefore, in the measurement apparatus 100 of the fifth configuration example, one of the magnet 130 and the coil 140 is fixed to the housing of the measurement apparatus 100 and the other is attached to the etalon 230. Then, the driving unit 160 drives the etalon 230, which is an optical component, by passing a driving current through the coil 140 to change the target wavelength. The driving unit 160 moves the etalon 230 so as to change the incident angle of the incident light with respect to the etalon 230. For example, when incident light is incident in the −Y direction on the XY plane, the driving unit 160 rotates the etalon 230 about the Z direction substantially perpendicular to the XY plane.

  FIG. 6 shows an example in which the magnet 130 is attached to the etalon 230 and the coil 140 is fixed to the housing of the measuring apparatus 100. As described with reference to FIG. 2, the measuring apparatus 100 may be provided with a magnetic sensor 150 provided at a position fixed with respect to the coil 140. In this case, the driving unit 160 detects the magnetic field detected by the magnetic sensor 150. The position of the etalon 230 may be specified using the strength of. Further, the driving unit 160 may perform feedback control of the position of the etalon 230 using the specified position of the etalon 230.

  In the measurement apparatus 100 according to the present embodiment, as described with reference to FIGS. 3 and 4, the coil 140 may be attached to the etalon 230 and the magnet 130 may be fixed, and the position detection magnet 210 may be further provided. May be. As described above, the measurement apparatus 100 of the fifth configuration example can measure the light components of a plurality of target wavelengths by moving the etalon 230 using the magnet 130 and the coil 140, so that the light transmission of the measurement target is performed. A spectrum can also be measured. That is, according to the measurement apparatus 100 according to the present embodiment, it is possible to measure light components of a plurality of target wavelengths with a small size and low cost.

  The measurement apparatus 100 according to the present embodiment described above moves the optical components of the optical system 110 and / or the optical sensor unit 120 using the magnet 130 and the coil 140, changes the target wavelength to be measured, The measurement of the light component of the target wavelength has been described. Here, the optical components of the optical system 110 are not limited to the optical components such as the mirror, the spectroscopic prism, and the etalon described with reference to FIGS. The optical component may be a grating, a bandpass filter having a different pass wavelength depending on the position in the longitudinal direction, a liquid crystal filter, or a waveguide filter.

  As described above, since the measuring apparatus 100 according to the present embodiment moves the optical components and the like with a simple configuration using the magnet 130 and the coil 140, the measuring apparatus for measuring the component to be measured is downsized. Can do. Therefore, the measuring device 100 may be formed as a portable measuring device, or may be incorporated into a portable device or a portable terminal. Next, an example in which the measuring apparatus 100 is incorporated in a mobile terminal will be described.

  FIG. 7 shows a configuration example of the mobile terminal 300 according to the present embodiment. The mobile terminal 300 is, for example, a smartphone, a mobile phone, a tablet PC, a watch, a personal computer, or the like. The mobile terminal 300 includes the measurement device 100, a housing 310, an information processing unit 320, a wireless communication unit 330, a display unit 340, and a light source unit 350. The measuring device 100 may be any of the measuring devices 100 described with reference to FIGS. In the present embodiment, an example in which the measurement apparatus 100 functions as a gas sensor that measures a gas component contained in the outside air around the mobile terminal 300 will be described.

  The housing 310 accommodates each part including the measuring apparatus 100. The casing 310 has a hole 312 for taking outside air into the inside so that the outside air can be measured by the measuring apparatus 100. The measuring device 100 measures a gas component contained in the outside air taken from the hole 312.

  The information processing unit 320 performs information processing. The information processing unit 320 includes a CPU and may execute communication, data processing, calculation processing, and the like. The information processing unit 320 may function as the measurement unit 170 of the measurement apparatus 100.

  The wireless communication unit 330 communicates with the outside via a network. The wireless communication unit 330 may perform access to the Internet, mail transmission / reception, a telephone function, and the like. Further, the wireless communication unit 330 may transmit the measurement result of the measurement apparatus 100 to the outside via a network. The wireless communication unit 330 may receive an operation instruction of the measurement apparatus 100, an update of an operation program, an update of data to be used, and the like from the outside via a network.

  The display unit 340 is provided on one surface of the housing and displays a screen. The display unit 340 may display the processing result, processing status, processing data, and the like of the information processing unit 320. Further, the display unit 340 may display the measurement result of the measurement apparatus 100.

  The light source unit 350 supplies incident light to the measurement apparatus 100. The light source unit 350 preferably emits light in the infrared wavelength region. The light source unit 350 may be an LED, an LD, a lamp, a heater, or the like. The light source unit 350 may supply incident light to the measurement apparatus 100 substantially perpendicular to a surface that is not parallel to one surface of the housing 310. That is, the light source unit 350 may irradiate light substantially parallel to the one surface from the side surface side of the mobile terminal 300. Thereby, it is possible to reduce the increase in the thickness of the mobile terminal 300 and mount the measuring apparatus 100 on the mobile terminal 300.

  As described above, the measuring apparatus 100 may be mounted on the portable terminal 300 and function as a portable gas sensor. Although the mobile terminal 300 according to the present embodiment has been described to include the light source unit 350 and supply incident light to the measurement apparatus 100, the present invention is not limited to this. For example, the mobile terminal 300 uses sunlight, illumination, streetlights, and the like as light sources. The mobile terminal 300 may use an external heat source such as a heating element, a heating device, and an animal body temperature as a light source.

  In this case, the portable terminal 300 can use light incident from the outside as a light source by providing the housing 310 with a hole for light input. Note that the housing 310 may be provided with a hole for light input on a side surface substantially perpendicular to the surface where the display unit 340 is provided. Then, the measuring apparatus 100 may make incident light incident from a surface that is not parallel to one surface of the housing 310.

  Instead, the mobile terminal 300 may use an internal heating element as a light source. In this case, the measuring apparatus 100 may receive infrared light emitted from the information processing unit 320, the wireless communication unit 330, or at least a part of the power supply as incident light. Thereby, the measuring apparatus 100 can be further reduced in size.

  The portable terminal 300 according to the present embodiment has been described as an example of a device in which the measurement apparatus 100 is mounted and a gas sensor function is added. Instead of this, the measuring device 100 may be formed as a single sensor device. Such a sensor device includes, for example, a light source unit that outputs infrared light and a measurement device 100, and the measurement device 100 receives infrared light from the light source unit as incident light. Thereby, since a small and low-cost gas sensor or the like can be provided, the occurrence of an abnormality or the like can be detected earlier by installing such sensor devices at a plurality of locations. Moreover, the measuring apparatus 100 can also detect a fire by analyzing infrared light.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

DESCRIPTION OF SYMBOLS 10 Detection apparatus, 12 Optical filter, 14 Optical sensor part, 100 Measuring apparatus, 110 Optical system, 112 Beam splitter, 114 1st mirror, 116 2nd mirror, 120 Optical sensor part, 130 Magnet, 140 Coil, 150 Magnetic sensor, 160 driving unit, 170 measuring unit, 210 position detecting magnet, 220 spectral prism, 230 etalon, 300 portable terminal, 310 housing, 312 hole, 320 information processing unit, 330 wireless communication unit, 340 display unit, 350 light source unit

Claims (13)

A measuring device for measuring a light component of a target wavelength in incident light,
An optical system for extracting a light component of the target wavelength from the incident light;
An optical sensor unit for detecting a light component extracted by the optical system;
A magnet and a coil, one of which is fixed to the housing and the other is attached to an optical component included in the optical sensor unit or the optical system;
A drive unit for driving the optical sensor unit or the optical component by passing a drive current through the coil to change the target wavelength;
A measurement unit for measuring a light component detected by the optical sensor unit;
A measuring apparatus comprising:   The measurement apparatus according to claim 1, wherein the measurement unit is located in a region through which the light component of the incident light passes and measures a component included in a measurement target that transmits a part of the light component. The optical system extracts the light component from the incident light that has passed through the outside air,
The measurement device according to claim 1, wherein the measurement unit measures a target gas component in the outside air using the light component. A magnetic sensor provided at a fixed position with respect to the coil;
The measuring device according to any one of claims 1 to 3, wherein the driving unit specifies a position of the optical sensor unit or the optical component by using a magnetic field intensity detected by the magnetic sensor. One is fixed to the casing of the measuring device, and the other further includes a magnetic sensor and a position detection magnet attached to the optical sensor unit or the optical component,
The said drive part specifies the position of the said optical sensor part or the said optical component using the strength of the magnetic field by the said position detection magnet detected by the said magnetic sensor. The measuring device described. The optical system is
A beam splitter that transmits a portion of the incident light and reflects a portion thereof;
A first mirror that reflects the light transmitted through the beam splitter and causes the light to enter the optical sensor unit via the beam splitter;
A second mirror that reflects the light reflected by the beam splitter and causes the light to enter the optical sensor unit via the beam splitter;
Have
The measuring device according to any one of claims 1 to 5, wherein one of the magnet and the coil is attached to the first mirror or the second mirror as the optical component.   The measuring apparatus according to claim 1, wherein the optical system includes a spectroscopic prism as the optical component.   The measuring apparatus according to claim 1, wherein the optical system is a Fabry-Perot interferometer including an etalon as the optical component. The measuring apparatus according to claim 1, wherein the optical system includes a grating as the optical component.
A housing,
An information processing unit that performs information processing;
A wireless communication unit that communicates with the outside via a wireless network;
A display unit provided on one surface of the housing and displaying a screen;
A measuring device according to any one of claims 1 to 9,
A mobile terminal comprising:   The portable terminal according to claim 10, wherein the measuring device enters the incident light from a surface that is not parallel to the one surface of the housing.   The portable terminal according to claim 10, wherein the measurement device receives infrared light emitted from the information processing unit, the wireless communication unit, or at least a part of a power supply as the incident light. A light source that outputs infrared light;
The measurement apparatus according to any one of claims 1 to 9, wherein infrared light from the light source unit is received as the incident light;
A sensor device comprising:

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