JP2020038168A - Signal restoration system and signal restoration device - Google Patents

Abstract

To simplify a check of a state of a measurement device.SOLUTION: A signal restoration system has a measurement device and a signal restoration device 2. The measurement device comprises: an irradiation unit that repeatedly irradiates a measurement range with a light beam; a condense lens that condenses the light beam radiated by the irradiation unit; a light reception unit that converts intensity of the light beam condensed by the condense lens into an electric signal; a threshold setting unit that sets a different threshold for each unit with a time to be taken for the irradiation unit to scan the entire measurement range as a unit; and a binary unit that binarizes the measurement signal on the basis of the set threshold, and generates binary data having an area in which the measurement signal is equal to or more than the threshold associated with the threshold, for each unit. The signal restoration device 2 comprises: an acquisition unit 231 that acquires the binary data; the acquisition unit 231 that acquires the measurement signal from the measurement device; a reconfiguration unit 232 that generates a reconfiguration signal using the binary data generated for each unit; and an output unit 234 that outputs the reconfiguration signal.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a signal restoration system and a signal restoration device for restoring an electric signal.

  2. Description of the Related Art Conventionally, in a measuring device for measuring a dimension of a measurement object (hereinafter, referred to as a work), a state of an installation position of a light receiving unit that receives a light beam emitted from an irradiation unit, or a state of dirt on a glass surface of the light receiving unit (hereinafter, a state of contamination) An oscilloscope is used as a means for confirming the state of the measurement device). Patent Literature 1 discloses an oscilloscope that digitally processes an input signal and displays a waveform of the input signal in a raster manner.

JP 2014-190981 A

  By using an oscilloscope as in Patent Literature 1, the state of the measuring device can be confirmed based on the displayed waveform. However, since the oscilloscope is not easy to handle, it is not easy for an operator who is not used to handling the oscilloscope (hereinafter, referred to as a user) to check the state of the measuring device.

  Therefore, the present invention has been made in view of these points, and an object of the present invention is to provide a signal restoration system and a signal restoration device that can simplify confirmation of a state of a measurement device.

  A signal restoration system according to a first aspect of the present invention is a system including a measurement device that measures a dimension of an object to be measured and a signal restoration device that restores an electric signal indicating a result measured by the measurement device. An irradiation unit that repeatedly irradiates the measurement area with the light beam while scanning the measurement area in which the measurement target is arranged, and a light condensing unit that condenses the light beam emitted by the irradiation unit. A lens, a light receiving unit that receives the light beam condensed by the condenser lens, and converts the intensity of the received light beam into the electric signal, and a unit in which the irradiation unit scans the entire measurement range. A threshold setting unit that sets a different threshold for each unit, based on the set threshold, binarizes a measurement signal indicating a time change of the electric signal converted by the light receiving unit, and the measurement signal is the threshold. that's all A binarizing unit that generates binarized data in which the region is associated with the threshold, for each of the units, wherein the signal restoring unit obtains the binarized data, A reconstructing unit configured to generate a reconstructed signal obtained by reconstructing the measurement signal by using the binarized data generated for each case; and an output unit outputting the reconstructed signal.

  The signal restoration device may be configured such that an intensity of the reconstructed signal is an intensity of an electric signal converted from a maximum intensity of the light beam obtained by condensing the light beam emitted from the irradiation unit by the condenser lens. It may further include a comparison unit for comparing whether or not the intensity of the maximum measurement signal indicating a time change is less than or equal to, or the output unit outputs the reconstructed signal together with a comparison result compared by the comparison unit. May be.

  The output unit, when outputting an image indicating the measurement range, the comparison result indicates, the range of the intensity of the reconstructed signal is less than the intensity of the maximum measurement signal, the intensity of the reconstructed signal is the maximum The signal may be output in a mode different from the range other than the range below the intensity of the measurement signal.

  The signal restoration device indicates positional relationship information indicating a positional relationship between the irradiation unit and the light receiving unit, and indicates the reconstructed signal to be reconfigured when the irradiation unit and the light receiving unit are in the positional relationship. The storage unit may further include a storage unit that stores the signal pattern in association with the signal pattern, the comparison unit determines whether the reconstructed signal matches any of the plurality of signal patterns stored in the storage unit May be compared, or the output unit may output the positional relationship information stored in the storage unit in association with the signal pattern corresponding to the reconstructed signal, which is indicated by the comparison result. .

  The measuring device may further include a transmitting unit that transmits the binarized data, and the acquiring unit acquires the binarized data transmitted by the transmitting unit from each of the plurality of measuring devices. The output unit may output the reconstructed signal in association with each of the plurality of measurement devices.

  The signal restoration device according to the second aspect of the present invention is an irradiation unit that repeatedly irradiates the measurement range with the light beam while scanning the measurement range in which the measurement target is arranged, and the irradiation unit irradiates the measurement unit. A condensing lens that condenses the light beam, a light receiving unit that receives the light beam condensed by the condensing lens and converts the intensity of the received light beam into an electric signal, and the irradiation unit covers the entire measurement range. Using a scanning time as a unit, a threshold setting unit for setting a different threshold for each unit, and binarizing a measurement signal indicating a time change of the electric signal converted by the light receiving unit based on the set threshold. A binarization unit that generates binarized data in which the area where the measurement signal is equal to or larger than the threshold is associated with the threshold, for each unit, and the binarized data generated for each unit. Reconstructed the measurement signal Comprising a reconstruction unit for generating a formed signal, and an output unit which outputs the reconstructed signal.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that confirmation of the state of a measuring device can be simplified.

FIG. 1 is a diagram for describing an overview of a signal restoration system. FIG. 1 is a diagram for describing an overview of a signal restoration system. It is a figure showing composition of a measuring device. FIG. 3 is a diagram illustrating a configuration of a signal restoration device. FIG. 4 is a diagram schematically illustrating a screen output by an output unit. FIG. 4 is a diagram schematically illustrating a screen output by an output unit. It is a sequence diagram which shows the flow of a process of a signal restoration system.

[Overview of Signal Restoration System S]
Hereinafter, an outline of the signal restoration system S will be described with reference to FIGS. 1 and 2. 1 and 2 are diagrams for explaining an outline of the signal restoration system S. The signal restoration system S is a system that outputs information indicating the state of the measurement device 1. The signal restoration system S has a measurement device 1 and a signal restoration device 2.

  The measuring device 1 is a device that measures a dimension of a work. The measuring device 1 includes an irradiation unit 11, a light receiving unit 12, and a signal processing unit 14. The irradiation unit 11 repeatedly irradiates the measurement range with the light beam while scanning the measurement range where the workpiece is arranged. The measurement range is an area between the irradiation unit 11 and the light receiving unit 12 through which the light beam emitted by the irradiation unit 11 passes. In this specification, the light beam irradiated by the irradiation unit 11 will be described as a linear light beam. The irradiation unit 11 performs 3200 scans per second, for example, when the period during which the entire measurement range is irradiated with the light beam is one scan.

  The light receiving unit 12 receives the light beam condensed by the condenser lens, and converts the intensity of the received light beam into an electric signal. In the measurement device 1 in the present specification, each of the irradiation unit 11 and the light receiving unit 12 can be installed at an arbitrary position within a range where the light receiving unit 12 can receive the light beam irradiated by the irradiation unit 11.

  The signal processing unit 14 controls the operations of the irradiation unit 11 and the light receiving unit 12. In addition, the signal processing unit 14 calculates the size of the work placed in the measurement range based on the electric signal converted by the light receiving unit 12. Further, the signal processing unit 14 generates data for restoring the electric signal converted by the light receiving unit 12.

  The signal restoration device 2 is a device for restoring an electric signal indicating a result measured by the measurement device 1, and is, for example, a computer. In the signal restoration system S, the measurement device 1 and the signal restoration device 2 are connected by an external interface (for example, a USB (Universal Serial Bus)).

  The signal restoration system S performs processing in a state where no work is arranged in the measurement range. In the example shown in FIG. 1, dirt G adheres to the upper part of the condenser lens. In this case, first, in the measuring device 1, the irradiation unit 11 irradiates the measurement range with the light beams from top to bottom while scanning the measurement range with the light beams ((1) in FIG. 1).

  The light receiving unit 12 receives the light beam irradiated by the irradiation unit 11 onto the measurement range via the condenser lens, and converts the intensity of the received light beam into an electric signal ((2) in FIG. 1). FIG. 2A is a diagram schematically illustrating a time change (hereinafter, referred to as a measurement signal) of the converted electric signal. 2A, 2B, 2C, and 2D, the vertical axis indicates the intensity of the measurement signal, and the horizontal axis indicates time. The left side of the measurement signal shown in FIG. 2A corresponds to the upper side of the condenser lens, and the right side of the measurement signal corresponds to the lower side of the condenser lens. As described above, since the dirt G is attached to the upper part of the condenser lens shown in FIG. 1, the intensity of the light beam that has passed through the dirt G is the intensity of the light beam that has passed through another area where the dirt G is not attached. Lower. Therefore, in the measurement signal shown in FIG. 2A, the intensity of the left measurement signal is lower than the intensity of the right measurement signal.

  Returning to FIG. 1, the signal processing unit 14 sets a different threshold value for each scanning time unit, with the time during which the irradiation unit 11 scans the entire measurement range as a scanning time unit ((3) in FIG. 1). The threshold value indicates the intensity (magnitude) of the electric signal. The signal processing unit 14 stores in advance 200 threshold values having different values. FIG. 2B is a diagram schematically illustrating a multi-step threshold value. The solid line shown in FIG. 2 (b) indicates the threshold value of 10 levels, and the broken line shown in FIG. 2 (b) indicates the electric signal of FIG. 2 (a). The signal processing unit 14 sets, for example, a threshold value as shown in FIG.

  Returning to FIG. 1, the signal processing unit 14 binarizes the measurement signal based on the set threshold and generates binarized data in which a region where the measurement signal is equal to or larger than the threshold is associated with the threshold for each scanning time unit. ((4) in FIG. 1). FIG. 2C is a diagram schematically illustrating the binarized data generated for each scanning time unit. As shown in FIG. 2C, in the binarized data corresponding to 8 to 10 levels, the intensity of the electric signal on the left as in the electric signal shown in FIG. It is lower than the strength.

  Returning to FIG. 1, when the signal restoration unit 2 acquires the binarized data generated for each scanning time unit by the signal processing unit 14, the signal restoration unit 2 reconstructs the measurement signal using the acquired binarized data. Is generated ((5) in FIG. 1). The reconstructed signal is a signal indicating the relationship between the position of the light beam irradiation or the time of the light beam irradiation and the value of the binary data.

  FIG. 2D is a diagram schematically illustrating the reconstructed signal. As illustrated in FIG. 2D, the signal restoration device 2 generates a reconstructed signal using the binarized data generated for each scanning time unit, and thereby converts the electric signal illustrated in FIG. Restore. For example, when the irradiation unit 11 of the measurement device 1 performs scanning 3200 times per second and the signal processing unit 14 sets a 200-level threshold, the signal restoration device 2 performs 16 times per second, that is, 62.5 times. A reconstructed signal will be generated every millisecond interval.

  Then, the signal restoring device 2 outputs the generated reconstructed signal as information indicating the state of the measuring device 1 ((6) in FIG. 1). The signal restoring device 2 outputs a reconstructed signal as shown in FIG. 2D at intervals of 62.5 milliseconds, for example, so that the signal is reconstructed in the same manner as the waveform of the electric signal output by the oscilloscope. Output configuration signal. Since the signal restoration system S outputs 16 reconstructed signals per second, the signal restoration system S can exhibit sufficient performance as an application for checking the state of the measurement device 1.

By doing so, the signal restoration system S outputs information (a reconstructed signal in a form representing the intensity of the light beam received by the light receiving unit 12) similar to the information (waveform of the electric signal) output by the oscilloscope. can do. For example, when performing maintenance on the measuring apparatus 1, the user can confirm that dirt is attached to the condenser lens by referring to the reconstructed signal output by the signal restoring apparatus 2. As a result, the signal restoration system S can simplify the confirmation of the state of the measuring device 1.
Hereinafter, the configurations of the measurement device 1 and the signal restoration device 2 will be described.

[Configuration of Measurement Apparatus 1]
FIG. 3 is a diagram illustrating a configuration of the measuring device 1. The measuring device 1 includes an irradiation unit 11, a light receiving unit 12, an interface 13, and a signal processing unit 14. The irradiation unit 11 includes a laser power supply 111, a laser light source 112, a reflection mirror 113, a motor 114, a polygon mirror 115, a collimator lens 116, and a first light receiving element 117.

The laser power supply 111 controls the operation of the laser light source 112 by turning on and off the supply of power to the laser light source 112 based on control from the signal processing unit 14 described later.
The laser light source 112 is, for example, a semiconductor laser device. The laser light source 112 emits a light beam based on control from the laser power supply 111.

The reflection mirror 113 reflects a light beam emitted from the laser light source 112 and makes the light beam enter the polygon mirror 115.
The motor 114 rotates a polygon mirror 115 arranged coaxially with the motor 114 based on control from a signal processing unit 14 described later.

The polygon mirror 115 causes the light beam incident via the reflection mirror 113 to enter the collimator lens 116 while rotating.
The collimator lens 116 converts a light beam incident from the polygon mirror 115 into a parallel light beam.

  The first light receiving element 117 is installed at a position capable of receiving a light beam that passes through the collimator lens 116 after one scan is completed. When the first light receiving element 117 detects a light beam incident via the collimator lens 116 after the end of the scanning, the first light receiving element 117 inputs a reference signal used for specifying a section of the scanning reference unit to the signal processing unit 14.

The light receiving unit 12 includes a condenser lens 121, a second light receiving element 122, and an amplifier 123.
The condenser lens 121 condenses the light beam irradiated by the irradiation unit 11 and causes the light beam to enter the second light receiving element 122.

The second light receiving element 122 outputs an electric signal based on the intensity of the light beam collected by the condenser lens 121.
The amplifier 123 amplifies the electric signal output from the second light receiving element 122 and inputs the amplified electric signal to the signal processing unit 14.

  The interface 13 is a hardware interface for transmitting an electric signal output by the second light receiving element 122 to the signal restoration device 2. The interface 13 is, for example, a USB.

The signal processing unit 14 includes a threshold setting unit 141 and a binarization unit 142.
The threshold value setting unit 141 sets a different threshold value for each scanning time unit, with the time during which the irradiation unit 11 scans the entire measurement range as a scanning time unit. Specifically, the threshold setting unit 141 sets a different threshold every time a reference signal is input from the first light receiving element 117.

  For example, the threshold value setting unit 141 sets a threshold value from a multi-level threshold value (for example, a 200-level threshold value) in ascending order of numerical value for each scanning time unit. The threshold setting unit 141 sets, for example, a first-stage threshold from a multi-stage threshold as an initial value of the threshold, and each time a reference signal is input from the first light receiving element 117, Change to a step threshold. The multi-level thresholds set by the threshold setting unit 141 are stored in the measuring device 1 in advance.

  The threshold setting unit 141 can improve the accuracy of the electric signal restored by the signal restoration device 2 by increasing the number of threshold steps to be set. On the other hand, the threshold setting unit 141 can shorten the processing time until outputting the restored electric signal by reducing the number of threshold levels to be set. The threshold setting unit 141 inputs the set threshold to the binarization unit 142.

  The binarizing unit 142 has a comparator 143 and a generating unit 144. The binarization unit 142 binarizes the measurement signal based on the set threshold, and generates binarized data in which an area where the measurement signal is equal to or larger than the threshold is associated with the threshold for each scanning time unit.

  Specifically, first, the comparator 143 binarizes the electric signal output by the second light receiving element 122 based on the threshold value set by the threshold value setting unit 141. Then, the generation unit 144 generates binarized data in which an area where the electric signal is equal to or larger than the threshold is associated with the threshold for each scanning time unit.

  More specifically, the comparator 143 classifies the electric signal output from the second light receiving element 122 as “1” when the intensity of the electric signal is equal to or larger than the threshold set by the threshold setting unit 141, and the threshold setting unit 141 If the measured signal is lower than the set threshold, the measured signal is binarized by classifying the measured signal to “0”. Then, the generation unit 144 outputs the binarized data in which the threshold value set by the threshold value setting unit 141 is associated with the electric signal classified into “1” every time a reference signal is input from the first light receiving element 117. Generate.

  The binarized data is set, for example, at an extraction time at which the generation unit 144 extracts an electric signal classified as “1” by the comparator 143 at a timing synchronized with a clock signal transmitted by a clock circuit (not shown). This is data associated with a numerical value indicating the number of threshold levels. The extraction time indicates a time that has elapsed since the reference signal was input. The generation unit 144 transmits the generated binarized data to the signal restoration device 2 via the interface 13 for each scanning time unit.

[Configuration of signal restoration device 2]
FIG. 4 is a diagram illustrating a configuration of the signal restoration device 2. The signal restoration device 2 includes an interface 21, a storage unit 22, and a control unit 23.

The interface 21 is a hardware interface for receiving the binary data transmitted by the measuring device 1.
The storage unit 22 is a storage medium such as a read only memory (ROM), a random access memory (RAM), and a hard disk. The storage unit 22 stores a program executed by the control unit 23.

  The control unit 23 is, for example, a CPU (Central Processing Unit). The control unit 23 functions as an acquisition unit 231, a reconfiguration unit 232, a comparison unit 233, and an output unit 234 by executing a program stored in the storage unit 22.

  The acquisition unit 231 acquires the binarized data from the measurement device 1 via the interface 21 for each scanning time unit. The acquisition unit 231 inputs the acquired binarized data to the reconstruction unit 232 for each scanning time.

  The reconstructing unit 232 generates a reconstructed signal obtained by reconstructing the measurement signal using the binarized data generated for each scanning time unit. For example, when the horizontal axis indicates the time required for one scan and the vertical axis indicates the number of threshold steps, the reconstructing unit 232 determines the number of threshold steps for each extraction time included in each binarized data. , The reconstructed signal is generated by stacking the binarized data in ascending order.

  When the reconstructing unit 232 generates the reconstructed signal using the binarized data based on the measurement signal converted from the light beam condensed by the condenser lens 121 in the state shown in FIG. ) Is generated. An area where a part (upper left) of the reconstructed signal shown in FIG. 2D is missing is an area corresponding to the dirt G attached to the condenser lens 121 shown in FIG. Returning to FIG. 4, for example, when the irradiation unit 11 of the measurement device 1 performs scanning 3200 times per second and the signal processing unit 14 sets a threshold value of 200 steps, the signal restoration device 2 outputs 62.5 milliseconds. A reconstructed signal is generated at intervals of. The reconstruction unit 232 inputs the generated reconstruction signal to the output unit 234.

  The output unit 234 outputs the reconfiguration signal generated by the reconfiguration unit 232 as information indicating the state of the measurement device 1. Specifically, the output unit 234 outputs the reconstructed signal generated by the reconstructing unit 232 every time the reconstructing unit 232 inputs the reconstructed signal. The output unit 234 displays, for example, an image indicating a reconstructed signal as illustrated in FIG. 2D on a display (not illustrated) included in the signal restoration device 2. The output unit 234 may display the reconstructed signals input by the reconstructing unit 232 at predetermined intervals, for example, continuously on a display like a waveform output from an oscilloscope, or the reconstructing unit 232 may Each time a configuration signal is input, it may be switched and displayed on the display.

  The output unit 234 may output supplementary information for indicating the state of the measurement device 1 together with the reconfiguration signal. Specifically, first, the comparing unit 233 compares whether the strength of the reconstructed signal is lower than the strength of the maximum measurement signal. The maximum measurement signal is a measurement signal indicating a temporal change in the intensity of the electric signal converted from the maximum intensity of the light beam obtained by condensing the light beam emitted from the irradiation unit 11 by the condenser lens 121. The maximum measurement signal is stored in the storage unit 22 in advance. Then, the output unit 234 outputs the reconstructed signal together with the comparison result compared by the comparison unit 233.

  The output unit 234 may, for example, display a message indicating the comparison result on the display as supplementary information, or may output an image indicating the comparison result on the display. The output unit 234 may output, for example, an image indicating the reconstructed signal to a display together with an image indicating the maximum measurement signal. By doing so, the user can easily grasp the state of the measuring device 1.

  The output unit 234 may output information indicating a location of dirt attached to the condenser lens 121. Specifically, when outputting an image indicating the measurement range, the output unit 234 determines the range in which the intensity of the reconstructed signal is lower than the intensity of the maximum measurement signal as indicated by the comparison result, The information may be output to the screen in a manner different from a range other than a range below the signal strength.

  FIG. 5 is a diagram schematically illustrating the screen output by the output unit 234. FIG. 5A shows a reconstructed signal generated by the reconstructing unit 232. FIG. 5B shows the maximum measurement signal stored in the storage unit 22 in advance. FIG. 5C shows a screen representing the shape of the condenser lens 121.

  The reconstructed signal shown in FIG. 5A has a lower left signal intensity than the maximum measurement signal shown in FIG. 5B. In this case, as shown in FIG. 5C, the output unit 234 outputs the region R1 in which the intensity of the reconstructed signal is lower than the intensity of the maximum measurement signal, and determines whether the intensity of the reconstructed signal and the intensity of the maximum measurement signal are equal. An image shown in a mode different from the area R2 of the same degree is output on the screen. By doing so, the user can easily grasp where the dirt is attached on the condenser lens 121.

  The output unit 234 may output information for adjusting the installation position of the light receiving unit 12. In this case, the storage unit 22 stores the positional relationship information indicating the positional relationship between the irradiation unit 11 and the light receiving unit 12 and the reconstructed signal that is reconstructed when the irradiation unit 11 and the light receiving unit 12 are in a positional relationship. It is assumed that the data is stored in association with the signal pattern shown.

  In this case, first, the comparing unit 233 compares whether or not the reconstructed signal matches any one of the plurality of signal patterns stored in the storage unit 22. Then, the output unit 234 outputs the positional relationship information stored in the storage unit 22 in association with the signal pattern corresponding to the reconstructed signal indicated by the comparison result.

  FIG. 6 is a diagram schematically illustrating a screen output by the output unit 234. FIG. 6A shows a state in which the installation position of the light receiving unit 12 is shifted downward with respect to the irradiation unit 11. When the light receiving unit 12 is displaced to one of the upper and lower sides with respect to the irradiation unit 11, the time required for one scan is shorter than when the irradiation unit 11 and the light receiving unit 12 face each other, The width (length of time) of the reconstructed signal generated by the reconstruction unit 232 is shorter than the width of the maximum measurement signal. In addition, when the light receiving unit 12 is displaced to one of the upper and lower sides with respect to the irradiation unit 11, the light receiving unit 12 is scanned by one scan as compared with the case where the irradiation unit 11 and the light receiving unit 12 face each other. The amount of light received is reduced, and the height (intensity) of the reconstructed signal generated by the reconstruction unit 232 is lower than the height of the maximum measurement signal.

  The comparing unit 233 compares the reconstructed signal generated by the reconstructing unit 232 with each of the plurality of signal patterns stored in the storage unit 22, and specifies a signal pattern having a width shorter and a lower height than the maximum measurement signal. I do. Then, the output unit 234 outputs a message as shown in FIG. 6A to the screen as the positional relationship information stored in the storage unit 22 in association with the signal pattern specified by the comparison unit 233. Further, as shown in FIG. 6A, the output unit 234 determines that the region R3 in which the intensity of the reconstructed signal is lower than the intensity of the maximum measurement signal is equal to the intensity of the reconstructed signal and the intensity of the maximum measurement signal. An image shown in a mode different from that of the region R4 may be output to the screen together with the positional relationship information.

  FIG. 6B illustrates a state in which the light receiving unit 12 is shifted to one of the left and right sides with respect to the irradiation unit 11. The intensity of the measurement signal (reconstructed signal) is lower when the light receiving unit 12 is displaced to the right or left with respect to the irradiation unit 11 than when the irradiation unit 11 and the light receiving unit 12 face each other. That is, the height of the reconstructed signal generated by the reconstruction unit 232 is lower than the height of the maximum measurement signal. The width of the reconstructed signal when the light receiving unit 12 is shifted to the left or right with respect to the irradiation unit 11 is the same as the width of the maximum measurement signal.

  The comparing unit 233 compares the reconstructed signal generated by the reconstructing unit 232 with each of the plurality of signal patterns stored in the storage unit 22, and determines a signal pattern having a height lower than the maximum measurement signal and the same width. To identify. Then, the output unit 234 outputs a message as shown in FIG. 6B to the screen as the positional relationship information stored in the storage unit 22 in association with the signal pattern specified by the comparison unit 233. Further, as shown in FIG. 6B, the output unit 234 determines that the region R5 in which the intensity of the reconstructed signal is lower than the intensity of the maximum measurement signal is equal to the intensity of the reconstructed signal and the intensity of the maximum measurement signal. The image shown in a mode different from that of the region R6 may be output to the screen together with the positional relationship information. By doing so, the user can easily adjust the position of the measuring device 1.

[Process of signal restoration system S]
Subsequently, the flow of processing of the signal restoration system S will be described. FIG. 7 is a sequence diagram illustrating a flow of processing of the signal restoration system S. The processing of S2 in the processing of the signal restoration system S may be performed before the processing of S1. In this processing, the threshold setting unit 141 of the measuring apparatus 1 will be described as setting ten threshold values. This processing is started when the irradiation unit 11 irradiates a light beam to the measurement range (S1). Specifically, the collimator lens 116 converts a light beam emitted from the laser light source 112, which is incident via the reflection mirror 113 and the polygon mirror 115, into a parallel line light beam and emits the parallel light beam.

  When the irradiating unit 11 irradiates a light beam to the measurement range, the light receiving unit 12 receives the light beam condensed by the condenser lens 121, and converts the intensity of the received light beam into an electric signal (S2). Specifically, the second light receiving element 122 outputs an electric signal based on the intensity of the light beam condensed by the condenser lens 121. The second light receiving element 122 inputs the electric signal amplified by the amplifier 123 to the signal processing unit 14.

  The threshold value setting unit 141 sets a different threshold value for each scanning time unit with the time for the irradiation unit 11 to scan the entire measurement range as a scanning time unit (S3). Specifically, first, when the first light receiving element 117 of the irradiation unit 11 detects a light beam incident through the collimator lens 116 after the end of the scanning, the first light receiving element 117 uses the reference signal used to specify the section of the scanning reference unit. Is input to the signal processing unit 14. Then, when the reference signal is input from the first light receiving element 117, the threshold setting unit 141 sets a different threshold. The threshold setting unit 141 sets, for example, a first-stage threshold from a multi-stage threshold as an initial threshold, and sets the set threshold to the next threshold every time a reference signal is input from the first light receiving element 117. Change to a step threshold. The threshold setting unit 141 inputs the set threshold to the binarization unit 142.

  The binarization unit 142 of the signal processing unit 14 binarizes the measurement signal based on the set threshold, and binarizes data in which an area where the measurement signal is equal to or larger than the threshold is associated with the threshold, for each scanning time unit. (S4). Specifically, first, the comparator 143 classifies the electric signal output from the second light receiving element 122 as “1” when the intensity of the electric signal is equal to or greater than the threshold set by the threshold setting unit 141, and If the measured value is below the set threshold value, the measured signal is binarized by classifying the measured signal into “0”. Then, the generation unit 144 outputs the binarized data in which the threshold value set by the threshold value setting unit 141 is associated with the electric signal classified into “1” every time a reference signal is input from the first light receiving element 117. Generate.

  The generation unit 144 transmits the generated binarized data to the signal restoration device 2 via the interface 13. When transmitting the generated binarized data to the signal restoration device 2, the generation unit 144 returns the process to S1. The measuring apparatus 1 repeats the processing from S1 to S4 for each scanning time unit.

  The acquisition unit 231 of the signal restoration device 2 acquires binary data from the measurement device 1 (S5). The acquisition unit 231 inputs the acquired binarized data to the reconstruction unit 232. The reconfiguration unit 232 determines whether the threshold setting unit 141 of the measurement device 1 has finished setting the thresholds in multiple stages (S6). Specifically, the reconstructing unit 232 determines whether or not the acquiring unit 231 has acquired ten pieces of binary data corresponding to each of the threshold values of 1 to 10 levels.

  If the reconfiguration unit 232 determines that the multi-level threshold setting has not been completed (NO in S6), the process returns to S5. On the other hand, when the reconfiguration unit 232 determines that the multi-level threshold setting has been completed (YES in S6), the reconfiguration unit 232 generates a reconfiguration signal using the binarized data generated for each scanning time unit. (S7). The reconstruction unit 232 inputs the generated reconstruction signal to the output unit 234.

  Then, the output unit 234 outputs the reconstructed signal input by the reconstructing unit 232 (S8). After outputting the reconstructed signal, the signal restoration device 2 returns the process to S5, and repeats the processes from S5 to S8.

[Effects in the present embodiment]
As described above, the measuring device 1 receives the light beam irradiated on the entire measurement range via the condenser lens 121, and converts the intensity of the received light beam into an electric signal. The measuring device 1 binarizes a measurement signal indicating a time change of the converted electric signal based on a threshold set for each scanning time unit, and converts binarized data in which an area exceeding the threshold is associated with the threshold. Generated for each scanning time unit. Then, the signal restoration device 2 outputs a reconstructed signal generated using the binarized data generated for each scanning time unit.

  By doing so, the signal restoration system S can output information similar to the information output by the oscilloscope. For example, when performing maintenance on the measuring apparatus 1, the user can confirm that dirt is attached to the condenser lens by referring to the reconstructed signal output by the signal restoring apparatus 2. Further, the user refers to the reconstructed signal output by the signal restoring device 2 when installing the measuring device 1, for example, so that the installation position of the irradiation unit 11 and the installation position of the light receiving unit 12 face each other. Can be confirmed. As a result, the signal restoration system S can simplify the confirmation of the state of the measuring device 1.

[Modification]
In the above description, the signal restoration system S has been described in which the signal restoration device 2 outputs a reconstructed signal based on the binary data output from one measurement device 1 connected via an external interface. Not exclusively. For example, in the signal restoration system S, the signal restoration device 2 may output a plurality of reconstructed signals based on the binarized data output from each of the plurality of measurement devices 1.

  In this case, the measurement device 1 further includes a communication unit and a transmission unit (not shown). Further, the signal restoration device 2 further includes a communication unit (not shown). The communication unit provided in each of the measurement device 1 and the signal restoration device 2 is an interface for connecting to a network, and includes, for example, a LAN controller. The transmission unit included in the measurement device 1 transmits the binarized data via the communication unit.

  In this case, the acquisition unit 231 of the signal restoration device 2 acquires the binary data transmitted by the transmission unit from each of the plurality of measurement devices 1. Then, the output unit outputs the plurality of reconstructed signals generated by the reconstructing unit 232 based on the plurality of binarized data in association with each of the plurality of measurement devices 1. In this way, the signal restoration system S can collectively check the states of the plurality of measurement devices 1. In addition, the signal restoration system S allows the signal restoration device 2 to acquire the binarized data from the measurement device 1 via the network, so that even if there is no empty space at the place where the measurement device 1 is installed, The state of the measuring device 1 can be confirmed from another place.

  As described above, the present invention has been described using the embodiment, but the technical scope of the present invention is not limited to the scope described in the above embodiment, and various modifications and changes are possible within the scope of the gist. is there. For example, the measuring device 1 may restore the electric signal. In this case, the measuring device 1 may further include a reconstructing unit and an output unit included in the signal restoring device 2, so that the measuring device 1 and the signal restoring device 2 may be integrated. By doing so, the user can check the state of the measuring device 1 even when there is no empty space at the place where the measuring device 1 is installed.

  Further, for example, the specific embodiment of the distribution / integration of the apparatus is not limited to the above-described embodiment, and all or a part of the apparatus is functionally or physically distributed / integrated in an arbitrary unit. can do. Further, new embodiments that are generated by arbitrary combinations of the plurality of embodiments are also included in the embodiments of the present invention. The effect of the new embodiment caused by the combination has the effect of the original embodiment.

Reference Signs List 1 Measuring device 11 Irradiation unit 111 Laser power supply 112 Laser light source 113 Reflection mirror 114 Motor 115 Polygon mirror 116 Collimator lens 117 First light receiving element 12 Light receiving unit 121 Condensing lens 122 Second light receiving element 123 Amplifier 13 Interface 14 Signal processing unit 141 threshold setting unit 142 binarization unit 143 comparator 144 generation unit 2 signal restoration device 21 interface 22 storage unit 23 control unit 231 acquisition unit 232 reconstruction unit 233 comparison unit 234 output unit S signal restoration system

Claims (6)

A measurement device for measuring the dimensions of the measurement object, a system having a signal restoration device for restoring an electric signal indicating the result measured by the measurement device,
The measuring device comprises:
An irradiation unit that repeatedly irradiates the measurement range with the light beam while scanning the measurement range in which the measurement target is arranged,
A condenser lens for condensing the light beam emitted by the irradiation unit,
A light receiving unit that receives the light beam condensed by the condenser lens and converts the intensity of the received light beam into the electric signal;
A threshold setting unit that sets a different threshold value for each unit, with the irradiation unit as a unit for scanning the entire measurement range,
Based on the set threshold value, a measurement signal indicating a time change of the electric signal converted by the light receiving unit is binarized, and a region where the measurement signal is equal to or larger than the threshold value is binarized in association with the threshold value. A binarizing unit that generates data for each unit;
With
The signal restoration device,
An acquisition unit that acquires the binarized data;
A reconstruction unit configured to generate a reconstructed signal obtained by reconstructing the measurement signal using the binarized data generated for each unit;
An output unit that outputs the reconstructed signal;
Signal restoration system comprising: The signal restoration device may be configured such that an intensity of the reconstructed signal is an intensity of an electric signal converted from a maximum intensity of the light beam obtained by condensing the light beam emitted from the irradiation unit by the condenser lens. Further comprising a comparing unit for comparing whether the intensity is lower than the intensity of the maximum measurement signal indicating a time change,
The output unit outputs the reconstructed signal together with a comparison result compared by the comparison unit.
The signal restoration system according to claim 1. The output unit, when outputting an image indicating the measurement range, the comparison result indicates, the range of the intensity of the reconstructed signal is less than the intensity of the maximum measurement signal, the intensity of the reconstructed signal is the maximum Output in a manner different from the range other than the range below the intensity of the measurement signal,
The signal restoration system according to claim 2. The signal restoration device indicates positional relationship information indicating a positional relationship between the irradiation unit and the light receiving unit, and indicates the reconstructed signal to be reconfigured when the irradiation unit and the light receiving unit are in the positional relationship. A storage unit that stores the signal pattern in association with the signal pattern;
The comparing unit compares the reconstructed signal to determine whether it matches any of the plurality of signal patterns stored in the storage unit,
The output unit indicates the comparison result, and outputs the positional relationship information stored in the storage unit in association with the signal pattern that matches the reconstructed signal,
The signal restoration system according to claim 2. The measurement device further includes a transmission unit that transmits the binary data,
The acquisition unit acquires the binary data transmitted by the transmission unit from each of the plurality of measurement devices,
The output unit outputs the reconstructed signal in association with each of the plurality of measurement devices,
The signal restoration system according to claim 1. An irradiation unit that repeatedly irradiates the measurement range with the light beam while scanning the measurement range in which the measurement target is arranged,
A condenser lens for condensing the light beam emitted by the irradiation unit,
A light receiving unit that receives the light beam condensed by the condenser lens and converts the intensity of the received light beam into an electric signal,
A threshold setting unit that sets a different threshold value for each unit, with the irradiation unit as a unit for scanning the entire measurement range,
Based on the set threshold value, a measurement signal indicating a time change of the electric signal converted by the light receiving unit is binarized, and a region where the measurement signal is equal to or larger than the threshold value is binarized in association with the threshold value. A binarizing unit that generates data for each unit;
A reconstruction unit configured to generate a reconstructed signal obtained by reconstructing the measurement signal using the binarized data generated for each unit;
An output unit that outputs the reconstructed signal;
A signal restoration device comprising:

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