JP2020101409A - Portable measurement device - Google Patents

Abstract

To reduce power consumption.SOLUTION: A measurement device (1) comprises: a halogen light source (16) that has an output of 10 W or more and irradiates a measurement object (2) with measurement light including near-infrared light; a measurement unit that receives transmitted light and/or reflected light from the measurement object, and measures a quality of the measurement object; and a voltage control unit (9) that supplies a voltage lower than a voltage upon measurement of the measurement unit to the halogen light source at least in a portion of a time at which the measurement unit does not perform the measurement.SELECTED DRAWING: Figure 2

Description

The present invention relates to a portable measuring device that measures the internal quality of a measurement target.

Conventionally, as a device for measuring the internal quality of an object to be measured (for example, fruits and vegetables), a non-destructive measuring device utilizing a spectroscopic analysis method has been used. In addition, there is a portable measuring device for the purpose of measuring in any place such as a garden or a house.

In the measuring device as described above, a halogen lamp with high power consumption is used as a light source. Further, since the portable measuring device is driven by a battery, it is necessary to reduce power consumption.

Japanese Patent Application Laid-Open No. 2004-242242 discloses an optical system for plate making, which can extend the life of the light source by applying a voltage lower than the rated voltage to the light source during non-measurement to maintain a state in which the light source can be immediately brought into a usable state. A light source voltage converter for a measuring device is disclosed.

Further, Patent Document 2 discloses a light amount adjusting device for a paddy/brown rice discrimination sensor.

Further, Patent Document 3 describes a spectroscopic analysis method for compensating for changes in output characteristics of a plurality of light receiving elements.

Japanese Utility Model Publication No. 63-109608 JP-A-8-105838 JP, 2000-206037, A

However, the device described in Patent Document 1 is mainly intended to extend the life of the lamp of the light source. Further, the device described in Patent Document 2 aims at speeding up the adjustment of the light amount of the sensor, and does not describe power consumption.

That is, Patent Documents 1 and 2 do not consider reducing the power consumption of a battery-powered portable measuring device that uses a halogen lamp that consumes a large amount of power.

One aspect of the present invention is to reduce power consumption of a portable measurement device.

In order to solve the above problems, a portable measuring device according to one aspect of the present invention includes a halogen light source having an output of 10 W or more, which irradiates a measuring object with measuring light including near-infrared light, and A measurement unit that receives transmitted light and/or reflected light from the measurement target to measure the quality of the measurement target, and at least a part of the time during which the measurement unit does not perform measurement, with respect to the halogen light source. And a voltage control unit that supplies a voltage lower than the voltage measured by the measurement unit.

According to the above configuration, even with a highly accurate measuring device that uses high-intensity measurement light of 10 W or more, a voltage lower than that at the time of measurement is supplied when measurement is not performed. Power consumption over time can be reduced. That is, the power consumption of the portable measuring device can be reduced.

Further, in the portable measuring device according to one aspect of the present invention, after the halogen light source is returned to a measurable state from a standby state in which a voltage lower than the voltage at the time of measurement is supplied, the halogen after the restoration is performed. The configuration further includes an acquisition unit that acquires the spectrum of the light emitted from the light source, and a correction unit that corrects the measurement value output by the measurement unit using the spectrum acquired by the acquisition unit.

According to the above configuration, it is possible to correct the measurement value output by the measurement unit using the spectrum of the light emitted from the halogen light source after restoration, so that the measurement can be performed even when the voltage of the light source is changed. The quality of the object can be measured more accurately.

The portable measuring device according to one aspect of the present invention includes a first power supply circuit that supplies a voltage at the time of the measurement, and a second power supply circuit that supplies a voltage lower than the voltage at the time of the measurement. The control unit may be configured to change the voltage supplied to the halogen light source by switching between the first power supply circuit and the second power supply circuit. According to the above configuration, the voltage supplied to the halogen light source can be switched by switching between the first power supply circuit and the second power supply circuit.

Further, in the portable measuring device according to an aspect of the present invention, a light blocking portion that blocks the measurement light emitted from the halogen light source to the outside, a blocking position that prevents the measurement light from being emitted to the outside, and It is preferable to further include an opening/closing mechanism that moves the light shielding unit between the light shielding unit and an emission position that emits the measurement light to the outside, and the opening/closing mechanism preferably includes a self-holding solenoid.

According to the above configuration, after the light blocking section has moved once, it is not necessary to apply a voltage until the light blocking section moves next time. In this way, since it is sufficient to apply the voltage only when the opening/closing operation is performed, it is possible to reduce the power consumption for moving the light shielding unit as compared with the related art.

In addition, in the portable measuring device according to one aspect of the present invention, the opening/closing mechanism further includes a spring that pulls back the light-shielding portion that has moved in one direction by the action of the self-holding solenoid in the opposite direction. May be. According to the above configuration, the light-shielding portion can be moved from the emitting position to the blocking position by the force of the spring, so that the power consumption can be further reduced.

According to one embodiment of the present invention, power consumption of the portable measurement device can be reduced.

It is a perspective view showing the appearance of measuring device 1 concerning Embodiment 1 of the present invention. It is a block diagram which shows the structure of the said measuring device. It is a figure which shows the structure of the opening/closing mechanism with which the said measuring device is equipped. It is a figure which shows the structure of the spectroscope with which the said measuring device is equipped. It is a figure which shows the structure of the disc with which the said measuring device is equipped. It is a flow chart which shows an example of the flow of processing in the above-mentioned measuring device.

[Embodiment 1]
(Configuration of measuring device 1)
FIG. 1 is a perspective view showing the outer appearance of a measuring device 1 according to the first embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of the measuring device 1.

The measuring device 1 irradiates fruits and vegetables (for example, fruits and vegetables such as apples and mandarins (hereinafter referred to as measurement object 2)) with measurement light, receives transmitted and/or reflected light, and analyzes the received light by a spectroscopic analysis method The non-destructive measurement of the internal qualities of the measurement target 2, such as sugar content, acidity, and injury level, is a battery-driven portable measuring device. However, the measurement target of the portable measuring device of the present invention is not limited to fruits and vegetables, and may be an object of other organism origin such as grain.

As shown in FIGS. 1 and 2, the measurement device 1 includes a control unit 3, a light projecting unit 4, a light receiving unit 5, an input unit 6, a display unit 7, a storage unit 8, a sensor unit 29, a first power supply circuit 13, The second power supply circuit 14 and the fiber 15 are provided.

The input unit 6 receives instructions from the user (input of the type of the measurement target 2, instruction to start measurement, etc.). The input unit 6 outputs the input information of the type of the measurement target 2 to the control unit 3.

The light projecting unit 4 irradiates the measurement target 2 with measurement light. As shown in FIG. 2, the light projecting unit 4 includes a halogen light source 16, an opening/closing mechanism 17, and a fiber 18.

The halogen light source 16 is a halogen lamp for irradiating the measuring object 2 with the measuring light, and irradiates the fiber 18 with the measuring light. The halogen light source 16 also irradiates the light receiving unit 5 with light via the fiber 15 for reference measurement and wavelength calibration measurement.

Since the transmittance at a specific wavelength is used for the spectroscopic analysis used for the measurement, a light source with little change in wavelength intensity around the measurement wavelength is preferable. The halogen light source 16 emits light in the wavelength range of 500 to 2500 nm, for example, as measurement light. When measuring the sugar content, the specific wavelength is 600 to 1000 nm, and the halogen light source 16 is suitable as a light source for sugar content measurement because the halogen light source 16 has little change in wavelength intensity at 600 to 1000 nm. In addition, if the light source has high brightness, it is possible to perform measurement with high accuracy. Therefore, it is preferable that the halogen lamp be capable of emitting light with high brightness of, for example, 10 W or more.

FIG. 3 is a diagram showing the structure of the opening/closing mechanism 17. The opening/closing mechanism 17 is a mechanism for blocking the measurement light so that the measurement light emitted from the halogen light source 16 is not emitted to the measurement target 2 except during measurement (that is, the measurement light is not emitted to the outside). is there. As shown in FIGS. 2 and 3, the opening/closing mechanism 17 includes a light shielding unit 20, a solenoid 19, a spring 30, and a plunger 40.

The light blocking unit 20 moves between a blocking position that blocks the measurement light from the halogen light source 16 and an emission position that does not block the measurement light under the control of the solenoid 19. The solenoid 19 is a self-holding solenoid, and moves the light shielding unit 20 when a voltage is applied.

Specifically, when the voltage is applied to the solenoid 19 when the light shielding unit 20 is at the cutoff position, the solenoid 19 performs a suction operation (specifically, by pulling the plunger 40 by an electromagnetic force). , The light shielding part 20 is moved to the emission position (right side in FIG. 3, one direction). When voltage is applied to the solenoid 19 again, the solenoid 19 loses its magnetic force, and the force of the spring 30 moves the light shielding portion 20 to the blocking position (left side in FIG. 3, reverse direction). The blocking position and the emission position may be opposite. In this way, the light-shielding portion 20 can be moved from the emitting position to the blocking position by the force of the spring 30, so that the power consumption can be reduced.

Conventionally, a rotary solenoid has been used as a solenoid for opening and closing the light shield, but the rotary solenoid needs to continue to apply a voltage to fix the light shield at the emission position. On the other hand, as described above, since the solenoid 19 is a self-holding solenoid, it is necessary for the solenoid 19 to apply a voltage after the light shielding unit 20 moves once until the light shielding unit 20 moves next time. Absent. In this way, since it is sufficient to apply the voltage only when the opening/closing operation is performed, it is possible to reduce the power consumption for moving the light shielding unit as compared with the related art.

The fiber 18 is a light guide fiber for guiding the measurement light from the halogen light source 16 to the measurement target 2 when the light shield 20 is at the emission position. The first power supply circuit 13 is a circuit that applies a high voltage for measurement (hereinafter, referred to as a first voltage) to the halogen light source 16 according to an instruction from the voltage control unit 9 described later. The second power supply circuit 14 is a circuit that applies a low voltage for non-measurement (hereinafter, referred to as a second voltage) to the halogen light source 16 according to an instruction from the voltage control unit 9.

The light receiving unit 5 receives the measurement light (hereinafter, measurement light) emitted from the light projection unit 4 and transmitted and/or reflected by the measurement target 2, and acquires the spectrum data of the received measurement light as an electric signal to obtain the acquisition unit 10 or Input to the internal quality value calculation unit 12. As shown in FIG. 2, the light receiving unit 5 includes a fiber 22 and a spectroscope 21. The fiber 22 is an optical fiber for receiving the measurement light from the measurement target 2 and guiding the measurement light to the spectroscope 21.

The spectroscope 21 receives the measurement light and outputs it as an electric signal to the acquisition section 10 or the internal quality value calculation section 12, and is, for example, a high-precision SW-NIR spectroscope. FIG. 4 is a diagram showing the configuration of the spectroscope 21. As shown in FIGS. 3 and 4, the spectroscope 21 includes a concave diffraction grating 24, a light receiving sensor 25, a filter unit 23, and a light entrance 28. The concave diffraction grating 24 splits the measurement light received from the light entrance 28 into lights of a plurality of wavelengths.

The light receiving sensor 25 is, for example, an infrared high-sensitivity linear image sensor, and obtains spectral spectrum data by detecting the amount of light for each wavelength in the measurement light that is dispersed by the concave diffraction grating 24. The spectral spectrum data is data indicating the light intensity for each wavelength of the measurement target light. Further, the light receiving sensor 25 outputs the measured spectral spectrum data to the acquisition unit 10 or the internal quality value calculation unit 12 as an electric signal.

The filter unit 23 includes a disk 26 having a plurality of filters and openings, and a motor 27. By rotating the disk 26 by driving the motor 27, various measurements are switched. FIG. 5 is a diagram showing the configuration of the disc 26. As shown in FIG. 5, the disc 26 is provided with one light shielding portion 26d, one wavelength calibration filter 26a, three reference filters 26b, and one opening portion 26c concentrically. Each part of the disk 26 is configured to overlap with the light entrance 28 when viewed from the normal direction of the disk 26 by rotating. The control of the rotation of the disc 26 (that is, the control of the motor 27) is performed by the control unit 3.

The light-shielding portion 26d is a portion of the disc 26 that does not allow light to pass therethrough, and is overlapped with the light inlet 28 when measuring dark current data during reference measurement, which will be described later. The wavelength calibration filter 26a is a filter that transmits light having at least two peaks in the wavelength range for measurement (600 nm to 1000 nm), and when the measurement device 1 performs wavelength calibration measurement, Light (calibration light) that is superposed and guided from the halogen light source 16 through the fiber 15 is passed. The wavelength calibration measurement is a measurement for acquiring data for correcting the deviation of the measurement value due to the deterioration of the optical components of the measuring device 1 and the disturbance light.

The three reference filters 26b are filters having different amounts of transmitted light, and when the measurement device 1 performs reference measurement, the three reference filters 26b are sequentially overlapped with the light entrance 28 and are guided by the halogen light source 16 through the fiber 15. Allows (reference light) to pass.

The disc 26 of the present embodiment has a configuration in which three reference filters 26b are provided, but the number of reference filters 26b provided in the disc 26 may be one, or two. It may be four or more. As the number of reference filters 26b increases, the measurement accuracy increases, but the time required for reference measurement increases. Note that the reference measurement is a measurement for acquiring data for correcting the deviation of the measurement value due to the halogen light source 16. The opening 26 c is overlapped with the light entrance 28 by the drive of the motor 27 and allows the measurement light guided through the fiber 22 to pass therethrough.

The display unit 7 displays information such as the type of the measurement target 2 and the corrected measurement value input from the correction unit 11 according to an instruction from the control unit 3. The input unit 6 and the display unit 7 may be a touch panel, in which case the touch panel may serve as both the input unit 6 and the display unit 7. The storage unit 8 stores information such as a calibration formula used when the internal quality value calculation unit 12 measures the quality of the measurement target 2 and a formula for the correction unit 11 to calculate a correction value from the spectrum of light. Storage area.

The sensor unit 29 irradiates the measurement target 2 with light emitted from the halogen light source 16 via the fiber 18, receives the measurement light transmitted and/or reflected by the measurement target 2, and receives the measurement light via the fiber 22. It is a member that guides light to.

The fiber 15 guides the light from the halogen light source 16 to the light receiving unit 5 when performing wavelength calibration measurement and reference measurement described later. The fiber 15 is configured to be switchable so as to pass light from the halogen light source 16 to the light receiving unit 5 during the wavelength calibration measurement and the reference measurement according to an instruction from the control unit 3. Hereinafter, the state in which light is transmitted is called an incident state, and the state in which light is not transmitted is called a non-incident state. According to an instruction from the control unit 3, the fiber 15 and the fiber 22 can be switched by the incidence switching member (not shown) to which light is incident on the spectroscope 21. That is, when the fiber 15 is in the incident state, the fiber 22 is in the non-incident state, and when the fiber 15 is in the non-incident state, the fiber 22 is in the incident state.

The control unit 3 controls each operation of the measuring device 1, and includes a voltage control unit 9, an acquisition unit 10, a correction unit 11, and an internal quality value calculation unit 12.

The voltage control section 9 controls the voltage applied to the light projecting section 4. Specifically, when the voltage control unit 9 receives a measurement instruction from the user via the input unit 6, the first voltage for measurement (for example, 12V) is applied to the halogen light source 16 of the light projecting unit 4. Is applied. In addition, the voltage control unit 9 controls the halogen light source 16 to apply the second voltage for non-measurement (for example, 7 V) to a part of the time during which the measurement is not performed, that is, in the standby state. It should be noted that the criterion for determining the standby state may be when an arbitrary time has elapsed after the measurement ends, or when the user instructs the input unit to shift from the measurement state to the standby state. May be.

Here, the wavelength characteristics of the halogen lamp change depending on the temperature of the filament. Therefore, when the halogen lamp is turned off during non-measurement, the temperature of the filament is lowered, and thus it takes time until measurement is possible (that is, until the wavelength of the halogen lamp is stabilized) when the filament lamp is turned on. Furthermore, since the rush power flows from the time of turning off the halogen lamp to the time of lighting the halogen lamp, power consumption increases, so it is not preferable to turn off the halogen lamp during non-measurement. From the above, in order to prevent the change of the wavelength characteristic while reducing the power consumption, the voltage applied to the halogen light source 16 at the time of non-measurement is set to about 50 to 50% of the voltage at the time of the measurement, to the extent that the wavelength characteristic is not significantly changed. It is preferable to lower it to about 70%. That is, the second voltage is preferably about 50 to 70% of the first voltage.

The acquisition unit 10 acquires the spectrum data of the light acquired from the light receiving unit 5 and outputs it to the correction unit 11. The internal quality value calculation unit 12 calculates the internal quality value of the measurement target 2 by referring to the calibration formula stored in the storage unit 8 using the spectrum data of the light acquired from the light receiving unit 5. The internal quality value calculation unit 12 inputs the calculated internal quality value to the correction unit 11. The correction unit 11 corrects the measurement value acquired from the internal quality value calculation unit 12 based on the data acquired from the acquisition unit 10.

(An example of the flow of processing in the measuring device 1)
Next, an example of the flow of processing (control method) of the measuring device 1 will be described with reference to FIG. FIG. 6 is a flowchart showing an example of the flow of processing in the measuring device 1. As a premise, the measuring apparatus 1 is powered on, and a low voltage for non-measurement is applied from the second power supply circuit 14 to the halogen light source 16 in a standby state. In addition, the light shielding unit 20 is in a cutoff state.

In the process of the measuring apparatus 1, first, the type of fruits and vegetables as the type of the measurement target 2 is input from the input unit 6 to the control unit 3 by a user operation (step S1). When the type of fruits and vegetables is input, the voltage control unit 9 of the control unit 3 switches the circuit for applying the voltage to the halogen light source 16 from the second power supply circuit 14 to the first power supply circuit 13, and the voltage for measurement One voltage is applied (step S2).

Next, the control unit 3 switches the fiber 15 to the incident state after a predetermined time has elapsed. In addition, the control unit 3 operates the solenoid 19 to move the light blocking unit 20 from the blocking position to the emission position (step S3).

Next, the measuring device 1 performs reference measurement (step S4). Specifically, the halogen light source 16 that has been restored by being applied with the measurement voltage causes the reference light to enter the light entrance 28 through the fiber 15 in the incident state. In this state, the control unit 3 drives the motor 27 to sequentially stack the plurality of reference filters 26b on the light entrance 28. Each time the reference filter 26b is switched, the light receiving sensor 25 acquires the spectrum data of the reference light that has passed through each reference filter 26b, and outputs it to the acquisition unit 10 as measurement reference spectrum data. Next, the control unit 3 drives the motor 27 to overlap the light shielding unit 26d on the light entrance 28, and in this state, the light receiving sensor 25 acquires the spectrum data of light as constant dark current data, and the acquisition unit 10 Output to. The acquisition unit 10 outputs the received measurement reference spectrum data and measurement dark current data to the correction unit 11 (step S3).

Before the measurement, the reference reference spectrum data and the reference dark data are measured in advance and stored in the storage unit 8. Specifically, first, when the measurement atmosphere temperature is the reference temperature (for example, 25° C.), the control unit 3 sets the fiber 15 to the incident state, operates the motor 27, and operates the plurality of reference filters 26b during non-measurement. Are sequentially stacked on the light entrance 28. Next, the light receiving sensor 25 acquires the spectrum data of the reference light emitted from the halogen light source 16 for each reference filter 26b and transmitted through the reference filter 26b as reference reference spectrum data, and stores the reference reference spectrum data in the storage unit 8. I will let you. Next, the control unit 3 drives the motor 27 at the reference temperature to overlap the light shielding unit 26d with the light entrance 28, and the light receiving sensor 25 stores the spectrum data acquired at this time as reference dark data in the storage unit. Store in 8.

Note that in one aspect of the present invention, when the value of the reference reference spectrum data is out of the predetermined range, the control unit 3 performs the following steps in order to stabilize the intensity of the light emitted by the halogen light source 16. Alternatively, each unit may be allowed to stand by for a predetermined time.

Next, the measuring apparatus 1 performs wavelength calibration measurement (step S5). Specifically, first, the control unit 3 drives the motor 27 and causes the wavelength calibration filter 26a to overlap the light entrance 28. As a result, the light emitted from the halogen light source 16 passes through the fiber 15, the light entrance port 28, and the wavelength calibration filter 26a and enters the light receiving sensor 25. The light receiving sensor 25 acquires the spectrum data of the received light and outputs it to the acquisition unit 10 as the calibration spectrum data. The acquisition unit 10 outputs the spectrum data for calibration acquired from the light receiving sensor 25 to the correction unit 11.

Next, the measuring apparatus 1 performs quality measurement (step S6). Specifically, first, the control unit 3 switches the fiber 22 to the incident state, drives the motor 27, and causes the opening 26c of the disk 26 to overlap the light entrance 28. In this state, the control unit 3 drives the solenoid 19 and moves the light shielding unit 20 to the emission position and the interruption position at predetermined time intervals, respectively, so that the measurement light from the halogen light source 16 is emitted to the measurement target 2. , Or shut off.

Next, the light receiving sensor 25 acquires the spectrum data of the measurement light when the light shielding unit 20 is at the emission position and at the cutoff position, the former as the measurement disturbance light-containing sample information and the latter as the measurement disturbance light information. Output to 10. The acquisition unit 10 outputs the received measurement disturbance light-containing sample information and the measurement disturbance light information to the internal quality value calculation unit 12.

Next, the correction unit 11 acquires the data acquired by the reference measurement and the data acquired by the wavelength calibration measurement from the storage unit 8 and the acquisition unit 10, and also acquires the measurement value from the internal quality value calculation unit 12, A corrected measurement value is calculated based on the data (step S6). As a method of correcting the quality measurement value calculated by the internal quality value calculation unit 12 based on the results of the reference measurement and the wavelength calibration measurement, for example, the method described in Patent Document 3 may be used.

After the correction unit 11 corrects the measured value, the control unit 3 causes the display unit 7 to display the corrected measured value. Next, the control unit 3 operates the solenoid 19 to move the light blocking unit 20 to the blocking position (step S7). Finally, the voltage control unit 9 switches the circuit for applying the voltage from the first power supply circuit 13 to the second power supply circuit 14, and applies the second voltage for non-measurement to the halogen light source 16 (step S8). ..

In the present embodiment, step S3 is performed after step S2 and step S8 is performed after step S7, but these steps may be performed before step S3 and step S8, respectively.

Further, in the present embodiment, the deviation of the measurement value is corrected by the reference measurement and the wavelength calibration measurement, but it is considered that the deviation is corrected by performing the reference measurement and taking a time until the wavelength of the halogen light source 16 stabilizes. The data obtained by the quality measurement may be corrected only from the data obtained by the wavelength calibration measurement. If no correction is made, steps S5 and S6 are omitted.

As described above, the measuring device 1 irradiates the measuring object 2 with the measuring light including near-infrared light, and the halogen light source 16 having an output of 10 W or more, and the transmitted light and/or the reflected light from the measuring object 2. A measuring unit (specifically, the light receiving unit 5 and the internal quality value calculating unit 12) that receives light to measure the quality of the measurement target 2, and at least a part of the time during which the measuring unit does not perform measurement. In addition, the halogen light source 16 is provided with a voltage control unit 9 that supplies a voltage lower than the voltage at the time of measurement by the measurement unit.

According to the above configuration, a voltage lower than that at the time of measurement is supplied when the measurement is not performed, so that power consumption at the time of non-measurement can be reduced. That is, it is possible to reduce the power consumption of the battery-driven measuring device 1 that uses a halogen lamp that consumes a large amount of power.

Further, the measuring apparatus 1 returns the halogen light source 16 to a measurable state from a standby state in which a voltage lower than the voltage at the time of measurement is supplied, and then analyzes the spectrum of the light emitted from the halogen light source 16 after the restoration. It further includes an acquisition unit 10 that acquires, and a correction unit 11 that corrects the measurement value output by the measurement unit using the spectrum acquired by the acquisition unit 10.

According to the above configuration, it is possible to correct the measurement value output by the measurement unit using the spectrum of the light emitted from the halogen light source 16 after restoration, and thus it is possible to more accurately measure the quality of the measurement target. it can.

[Example of software implementation]
The control block (particularly the control unit 3) of the measuring device 1 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software.

In the latter case, the measuring apparatus 1 includes a computer that executes the instructions of a program that is software that realizes each function. The computer includes, for example, one or more processors, and a computer-readable recording medium that stores the program. Then, in the computer, the processor reads the program from the recording medium and executes the program to achieve the object of the present invention. As the processor, for example, a CPU (Central Processing Unit) can be used. As the recording medium, a "non-transitory tangible medium" such as a ROM (Read Only Memory), a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. Further, a RAM (Random Access Memory) for expanding the program may be further provided. The program may be supplied to the computer via any transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program. Note that one aspect of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

The present invention is not limited to the above-described embodiments, but various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments Is also included in the technical scope of the present invention.

1 Measuring device (portable measuring device)
2 Measurement target 5 Light receiving part (measurement part)
9 voltage control unit 10 acquisition unit 11 correction unit 12 internal quality value calculation unit (measurement unit)
13 First Power Supply Circuit 14 Second Power Supply Circuit 16 Halogen Light Source 17 Opening/Closing Mechanism 19 Solenoid (Self-holding Solenoid)
20 light shield 30 spring

Claims (5)

A halogen light source having an output of 10 W or more, which irradiates a measurement object with measurement light including near infrared light;
A measurement unit that receives transmitted light and/or reflected light from the measurement target and measures the quality of the measurement target;
The halogen light source is provided with a voltage control unit that supplies a voltage lower than the voltage at the time of measurement by the measurement unit, at least in a part of the time during which the measurement unit is not performing measurement. Portable measuring device. After returning the halogen light source to a measurable state from a standby state in which a voltage lower than the voltage at the time of measurement is supplied, an acquisition unit that acquires a spectrum of light emitted from the halogen light source after the recovery,
The portable measurement device according to claim 1, further comprising: a correction unit that corrects the measurement value output by the measurement unit using the spectrum acquired by the acquisition unit. A first power supply circuit for supplying a voltage at the time of measurement,
A second power supply circuit for supplying a voltage lower than the voltage at the time of measurement,
The portable measuring device according to claim 1 or 2, wherein the voltage control unit changes the voltage supplied to the halogen light source by switching between the first power supply circuit and the second power supply circuit. .. A light blocking portion that blocks the measurement light emitted from the halogen light source to the outside,
A blocking position for preventing the measurement light from being emitted to the outside, and an opening/closing mechanism for moving the light shielding portion between an emission position for emitting the measurement light to the outside,
The portable measuring device according to claim 1, wherein the opening/closing mechanism includes a self-holding solenoid. The portable measuring device according to claim 4, wherein the opening/closing mechanism further includes a spring that pulls back the light-shielding portion that has moved in one direction by the action of the self-holding solenoid in the opposite direction.

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