KR102102776B1 - Method and apparatus for adjusting focus angle - Google Patents

Abstract

The method for adjusting the focus angle according to an embodiment of the present invention is a method for adjusting a focus angle through a transmitter for transmitting terahertz waves and a receiver for receiving the terahertz waves reflected by a reflective member, wherein the reflective member is disposed Changing the angle formed by the transmitter and the receiver in; Deriving a focal angle at which the intensity of the terahertz wave received through the receiving unit is maximum; And storing the focal angle in association with a distance from the reflective member to a memory unit.

Description

Focus angle adjustment method and focus angle adjustment device {METHOD AND APPARATUS FOR ADJUSTING FOCUS ANGLE}

The present invention relates to a focus angle adjusting method and a focus angle adjusting device, and more particularly, to a focus angle adjusting method and a focus angle adjusting device using terahertz waves.

Electromagnetic waves in the terahertz (1THz = 1 × 10 ¹² Hz) band have the characteristic of transmitting non-polar materials, and their wavelengths correspond to approximately several hundred μm (1THz = 300 μm). Industrially, it has been expected to be applied to quality control due to the property that a relatively high-resolution transmission image can be obtained.

It does not harm the human body compared to X-rays and the like, and is known to have a contrast ratio of a certain level or higher for cancer tissues and normal tissues.

Because the collective oscillation frequency of a molecule or an electron group is located in this band, the terahertz band spectroscopy technique is widely used to study various dynamic phenomena present in graphene, high-temperature superconductors, and DNA, which are attracting attention as a base material for next-generation electronic devices. Is being used.

Research into a device capable of performing a non-destructive inspection of an object using the terahertz wave has been conducted.

Patent Publication 10-2015-0039070 (published on April 09, 2015)

The method for adjusting the focus angle and the apparatus for adjusting the focus angle according to an embodiment of the present invention is for automatically adjusting the focus angle through a change in the intensity of terahertz waves.

The subject matter of the present application is not limited to the subject matter mentioned above, and another subject not mentioned will be clearly understood by a person skilled in the art from the following description.

According to an aspect of the present invention, in a method of adjusting a focal angle through a transmitting unit for transmitting terahertz waves and a receiving unit for receiving the terahertz waves reflected by a reflective member, in the state in which the reflective member is disposed, Changing an angle formed by the receiving unit; Deriving a focal angle at which the intensity of the terahertz wave received through the receiving unit is maximum; And storing the focus angle in a memory unit in association with a distance from the reflective member.

According to a method of adjusting a focal angle according to an aspect of the present invention, the transmitting unit and the receiving unit are driven such that an angle formed between the transmitting unit and the receiving unit is a focal angle according to the distance of the reflective member, and the object disposed on the reflective member is The transmitter may further include transmitting a terahertz wave, and measuring the moisture of the object according to a change in the intensity of the terahertz wave received through the receiver.

According to another aspect of the present invention, a transmitter for transmitting terahertz waves; A receiver configured to receive the terahertz wave reflected by a reflective member; A driving unit that changes an angle between the transmitting unit and the receiving unit; A memory unit for storing a focal angle having the maximum intensity of the terahertz wave received through the receiving unit according to a distance from the reflective member; And a control unit controlling the driving unit such that an angle of the transmitting unit and the receiving unit becomes the focal angle according to the distance of the reflective member.

The driving unit may include a transmission rotating unit for rotating the transmitting unit, a receiving rotating unit for rotating the receiving unit, and a driving motor for rotating the transmitting rotating unit or the receiving rotating unit.

The shaft of the driving motor is inserted into one of the rotating parts for transmission and the receiving part, and the diameter of the one rotating part may be smaller than the diameter of the other rotating part.

The driving unit further includes a relay rotating unit which is disposed between the transmitting rotation unit and the receiving rotation unit to transmit the driving force of the one rotating unit to the driving force of the other rotating unit, and the diameter of the one rotating unit is the relay It may be smaller than the diameter of the dragon rotating part.

The control unit controls the driving unit such that an angle between the transmitting unit and the receiving unit is a focal angle according to the distance of the reflective member, and the transmitting unit transmits terahertz waves toward an object disposed on the reflective member, and the receiving unit Receives reflected terahertz waves, and the controller can measure the moisture of the object according to the intensity change of the received terahertz waves.

The apparatus for adjusting the angle of focus according to another aspect of the present invention may further include a housing in which the transmitting unit and the receiving unit are disposed, and a transmitting unit provided in the housing to transmit air through the terahertz wave and prevent air from entering the housing. have.

The reflective member may be disposed outside the housing.

A moisture remover may be disposed inside the housing.

The method for adjusting the focus angle and the apparatus for adjusting the focus angle according to an embodiment of the present invention is for automatically adjusting the focus angle by setting the angle at which the intensity of the terahertz wave is maximized according to the distance of the reflective member.

The effects of the present application are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 shows an apparatus for adjusting a focal angle according to an embodiment of the present invention.
Figure 2 shows the angle change of the transmitter and receiver.
3 shows the principle of moisture measurement using terahertz waves.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the accompanying drawings are only described to more easily disclose the contents of the present invention, and the scope of the present invention is not limited to the scope of the attached drawings, and it is easily carried out by those skilled in the art. You will know.

In addition, the terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described herein, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

1 shows an apparatus for adjusting a focal angle according to an embodiment of the present invention. As shown in FIG. 1, the apparatus for adjusting the focus angle according to an embodiment of the present invention includes a transmitter 110, a receiver 120, a driver 130, a memory 140, and a controller 150.

The transmitter 110 transmits terahertz waves. The transmitter 110 may transmit the terahertz wave generated by the beating source unit. The beating source for forming the terahertz wave is common to those skilled in the art, so a detailed description thereof is omitted. The transmitter 110 may include a terahertz wave transmission module 111 that transmits a terahertz wave and a base member 113 for transmission where the terahertz wave transmission module 111 is fixed. The terahertz wave transmission module may include a photodiode for converting a beating source into electromagnetic waves.

The receiver 120 receives terahertz waves reflected by the reflective member 160. An object to be measured using terahertz waves may be disposed on the reflective member 160. The terahertz wave output from the transmitter 110 may reach the reflective member 160 through the lens 170 for transmission. The transmission lens 170 is a collimation lens and can make terahertz waves into parallel light.

At this time, the transmission lens 170 may be fixed to the transmission base member 113, the terahertz wave transmission module 111 and the transmission lens 170 in order to efficiently convert the terahertz wave to parallel light It can be arranged in a suitable position of the transmission base member 113. Accordingly, the terahertz wave transmission module 111 and the transmission lens 170 may rotate at the same time as the transmission base member 113 rotates.

The reflective member 160 may reflect terahertz waves toward the receiver 120, and the reflected terahertz waves may be incident on the receiver 120 through the receiving lens 180 which is a focusing lens. The receiving unit 120 may include a terahertz wave receiving module 121 and a receiving base member 123.

The terahertz wave receiving module 121 includes an antenna for receiving terahertz waves, a rectifier for rectifying the terahertz waves received through the antenna, and a low pass filter for low-pass filtering the rectified terahertz waves. You can. The terahertz wave receiving module 121 may be fixed to the receiving base member 123.

At this time, the receiving lens 180 may be fixed to the receiving base member 123, and the terahertz wave receiving module 121 and the receiving lens 180 may be used to efficiently convert condensing of terahertz waves. The credit base member 123 may be aligned at an appropriate location. Accordingly, the terahertz wave receiving module 121 and the receiving lens 180 may rotate simultaneously as the receiving base member 123 rotates.

The driving unit 130 changes the angle formed by the transmitting unit 110 and the receiving unit 120. The driving unit 130 may include a transmitting rotating unit 131, a receiving rotating unit 133, and a driving motor 135.

The transmission rotation unit 131 is for rotation of the transmission unit 110. The receiving rotation unit 133 is for rotating the receiving unit 120. The driving motor 135 rotates the transmitting rotating portion 131 or the receiving rotating portion 133. That is, in FIG. 1, the rotation axis of the drive motor 135 is connected to the transmission rotation unit 131, but in some cases, it may be connected to the reception rotation unit 133. The driving motor 135 may be a step motor, but is not limited thereto.

In FIG. 1, the rotating part 131 for transmission and the rotating part 133 for receiving may be in the form of a cogwheel, or may be pulley differently. In addition, in FIG. 1, a rotating rotation unit 137 in the form of a gear to be described later is disposed between the transmission rotation unit 131 and the reception rotation unit 133, and the relay rotation unit 137 is a transmission rotation unit 131 And the receiving rotation part 133 can be engaged at the same time. Alternatively, the gears of the rotating part 131 for transmission and the gears of the receiving part 133 may rotate in engagement with each other without the rotating part 137 for relay.

When the rotating part 131 for transmission and the rotating part 133 for receiving are in a pulley form, the rotating part 131 for transmission and the rotating part 133 for receiving may be connected by a belt.

On the other hand, the memory unit 140 stores the focal angle of the maximum intensity of the terahertz wave received through the receiving unit 120 according to the distance from the reflective member 160. The control unit 150 controls the driving unit 130 such that the angles of the transmitting unit 110 and the receiving unit 120 become the focal angles according to the distance of the reflective member 160.

The control unit 150 and the memory unit 140 may be implemented in the form of a circuit board, but are not limited thereto. A lock-in amp may be implemented on the circuit board to remove noise of the electrical signal output from the receiver 120.

The memory unit 140 and the control unit 150 will be described in detail later with reference to the drawings.

In FIG. 1, the display unit 190 may display an image corresponding to an electrical signal converted by the reception unit 120. The display unit 190 may include an LCD panel or an OLED panel, but is not limited thereto.

The optical cable box 200 is for storing an optical cable, and the optical cable may connect the beating source unit and the terahertz wave transmission module 111.

A method of adjusting a focal angle according to an embodiment of the present invention will be described with reference to FIG. 2. 2 shows an angle change between the transmitter 110 and the receiver 120.

The method for adjusting the focal angle according to an embodiment of the present invention includes changing the angle formed by the transmitting unit 110 and the receiving unit 120 while the reflective member 160 is disposed. The angle formed by the transmitter 110 and the receiver 120 may be an angle formed by the terahertz wave incident on the reflector and the terahertz wave reflected from the reflector. In the structure of the apparatus for adjusting the focal angle of FIG. 2, it may be an angle formed by the terahertz wave emitted from the transmitter 110 and the terahertz wave received by the receiver 120.

The method for adjusting the focal angle according to an embodiment of the present invention includes deriving a focal angle at which the intensity of the terahertz wave received through the receiver 120 is maximum. For example, as in the driving example 1 of FIG. 2, the reflective member 160 may be disposed at a distance d1 to measure the object 1 having the thickness t1.

At this time, the distance of the reflective member 160 may be a distance between objects at a reference point. For example, as shown in FIG. 2, it may be a distance between the reflective member 160 at the center of the receiving rotating part 133, or a reflective member at the center of the transmitting rotating part 131 or the center of the rotating rotating part 137. It may be a distance between 160.

The controller 150 may drive the driving motor 135 so that the angles of the transmitter 110 and the receiver 120 are changed from the minimum angle of the transmitter 110 and the receiver 120 to the maximum angle.

In this process, the control unit 150 continuously derives the strength of the terahertz wave received by the receiving unit 120, and the angle at which the receiving unit 120 receives the greatest strength of the terahertz wave, that is, a1 is obtained from the distance d1. Can be set to the focal angle of.

The method for adjusting the focal angle according to an embodiment of the present invention includes storing the focal angle in the memory unit 140 in association with the distance from the reflective member 160. The controller 150 may store the distance d1 and the focal angle a1 in the memory unit 140.

In the same way, when the reflective member is disposed at a distance d2 as in the driving example 2 of FIG. 2, the control unit 150 allows the angles of the transmitting unit 110 and the receiving unit 120 to be changed from a minimum angle to a maximum angle. The control unit 150 measures the intensity change of the terahertz wave received by the receiver 120 in this process, and can derive the angle a2 having the greatest intensity of the terahertz wave as the focal angle.

The controller 150 may store the derived focal angle a2 in relation to the distance d2 of the reflective member 160 in the memory unit 140.

The forms stored in the memory unit 140 may be variously formed. For example, a focal angle may be set for each unit distance in a range between a minimum distance and a maximum distance at which the reflective member 160 can be disposed.

Alternatively, a focal angle may be set for each distance of the reflective member 160 disposed according to the thickness of the object. For example, the manufacturer may perform measurement for object n from object 1 of different thickness, but the distance of the reflective member 160 may be different because the thickness of the objects is different. Therefore, a focal angle may be derived for each distance of the reflective member 160 according to the thickness of the metabolite.

As described above, since the focal angle is set according to the distance of the reflective member 160, when the distance of the reflective member 160 is set, the controller 150 controls the driving unit 130 to focus the angle of focus according to the distance of the reflective member 160 set. The transmission unit 110 and the reception unit 120 can be automatically driven to be

The apparatus for adjusting the angle of focus according to the embodiment of the present invention described above can measure the object without a beam splitter or the like to set the path of the terahertz wave, so the configuration of the apparatus can be simplified.

Since the beam splitter decreases the strength of the terahertz wave each time the terahertz wave passes, the transmitter 110 needs to transmit the terahertz wave of high power, and thus the design of the device is complicated and the manufacturing price may increase. have.

The apparatus for adjusting the focus angle according to an embodiment of the present invention may perform focus angle adjustment without a beam splitter, but may employ a beam splitter in some cases.

The apparatus for adjusting the focus angle and the method for adjusting the focus angle according to the embodiment of the present invention can measure moisture contained in the object. That is, as shown in FIG. 3, when the terahertz wave passes through moisture, the strength of the terahertz wave may be reduced.

Using this, the method for adjusting the focus angle according to an embodiment of the present invention is such that the angle formed by the transmitter 110 and the receiver 120 according to the distance of the reflective member 160 becomes the focal angle, and the transmitter 110 and the receiver 120 Is driven, the transmitting unit 110 transmits the terahertz wave toward the object disposed on the reflective member 160, and the moisture of the object according to the intensity change of the terahertz wave received through the receiving unit 120 It may further include the step of measuring.

The control unit 150 controls the driving unit 130 such that the angle formed by the transmitting unit 110 and the receiving unit 120 is the focal angle according to the distance of the reflective member 160, and the transmitting unit 110 is connected to the reflective member 160. The terahertz wave may be transmitted toward the object to be disposed, and the receiver 120 may receive the reflected terahertz wave. The control unit 150 may measure the moisture of the object according to the received intensity change of the terahertz wave.

The method for adjusting the angle of focus and the apparatus for adjusting the angle of focus according to the embodiment of the present invention may be used for distance measurement with an object in addition to moisture measurement.

Meanwhile, as illustrated in FIG. 1, an axis of the driving motor 135 may be inserted into one of the rotating part 131 for transmission and the rotating part 133 for receiving. At this time, the diameter of one rotating part into which the shaft of the driving motor 135 is inserted may be smaller than the diameter of the other rotating part.

Although the angle corresponding to the unit rotation of the drive motor 135 is large and the unit rotation angle of the one rotating part is large, the unit of the other rotating part according to the gear ratio between the transmitting rotating part 131 and the receiving rotating part 133 The angle per revolution can be reduced.

For example, even if the rotation angle per unit step of the step motor corresponding to the drive motor 135 is large, the transmission rotation unit 131 or the reception rotation unit according to the diameter ratio of the transmission rotation unit 131 and the reception rotation unit 133 The angle of rotation per unit step of the rotating unit 133 may be reduced. Therefore, even if the driving motor 135 that rotates precisely is not used, the focal angle according to the distance can be set in detail.

Meanwhile, as illustrated in FIG. 1, the driving unit 130 is disposed between the transmitting rotating unit 131 and the receiving rotating unit 133 to transmit the driving force of one rotating unit to the driving force of the other rotating unit. (137) may be further included. At this time, the diameter of one rotating portion may be smaller than the diameter of the relay rotating portion 137.

The relay rotating part 137 may also be in the form of a gear, and even if the unit rotation angle of one rotating part connected to the driving motor 135 is large, the other rotating part according to the gear ratio of the relay rotating part 137 and one rotating part. The angle per unit rotation of may be reduced.

On the other hand, the focus angle adjustment device according to an embodiment of the present invention, the housing 210 and The transmission unit 220 may be further included.

The transmitting unit 110 and the receiving unit 120 may be disposed inside the housing 210. The transmission unit 220 may be provided in the housing 210 and transmit terahertz waves while preventing air inflow from outside the housing 210. At this time, the reflective member 160 may be disposed outside the housing 210.

Due to such a structure, even if the housing 210 is not opened to the outside, measurement of the object may be performed. That is, since the measurement is performed in a state in which the object is not disposed inside the housing 210 but the object is disposed outside the housing 210, the housing 210 needs to be opened for the object 210 to be drawn in. none. Therefore, since moisture outside the housing 210 does not flow into the housing 210, measurement errors due to moisture measurement can be prevented in advance.

Since the permeable portion 220 must transmit terahertz waves and prevent external air from flowing into the housing 210, it may be made of a non-polar material such as plastic, dried wood, label sheet, or ceramic.

Meanwhile, a moisture remover 230 may be disposed inside the housing 210. The moisture remover 230 may include silica gel or carbon, but is not limited thereto. Accordingly, moisture inside the housing 210 may be removed, thereby reducing moisture measurement errors.

In addition, since the housing 210 is sealed by a sealing member such as a gasket or a rubber ring, it is possible to prevent external air from flowing into the housing 210.

As described above, the embodiments according to the present invention have been looked at, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope of the embodiments described above are those with ordinary knowledge in the art. It is self-evident. The above-described embodiments are to be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description and may be changed within the scope of the appended claims and their equivalents.

Transmitter (110)
Terahertz wave transmission module (111)
Base member for transmission (113)
Receiver 120
Terahertz wave receiving module (121)
Base member for receiving (123)
Driver 130
Transmission rotating part (131)
Receiving rotating part (133)
Drive motor (135)
Relay rotating part (137)
Memory unit 140
Control unit 150
Reflective member 160
Transmission Lens (170)
Receiving Lens (180)
Display unit 190
Optical cable box (200)
Housing (210)
Transmitting part (220)
Moisture remover (230)

Claims (10)

In the focus angle adjustment method through a transmitter for transmitting terahertz waves and a receiver for receiving the terahertz waves reflected by a reflective member,
Changing an angle between the transmitter and the receiver while the reflective member is disposed;
Deriving a focal angle at which the intensity of the terahertz wave received through the receiving unit is maximum; And
And storing the focal angle in relation to a distance from the reflective member to a memory unit.
The transmitting unit and the receiving unit are disposed inside the housing, and the transmission unit is provided in the housing to transmit air from outside the housing while transmitting terahertz waves,
The reflection member and the object are disposed outside the housing, the reflection member reflects the terahertz wave transmitted through the object, and the transmission angle adjustment method, characterized in that the transmission portion is made of a non-polar material.
According to claim 1,
The transmitting unit and the receiving unit is driven so that the angle between the transmitting unit and the receiving unit is a focal angle according to the distance of the reflective member,
Transmitting a terahertz wave by the transmitting unit toward the object disposed on the reflective member,
Measuring the moisture of the object according to the change in the intensity of the terahertz wave received through the receiving unit
Focus angle adjustment method further comprising a.
A transmitter for transmitting terahertz waves;
A receiver configured to receive the terahertz wave reflected by a reflective member;
A driving unit that changes an angle between the transmitting unit and the receiving unit;
A memory unit for storing a focal angle having the maximum intensity of the terahertz wave received through the receiving unit according to a distance from the reflective member; And
A control unit controlling the driving unit such that an angle of the transmitting unit and the receiving unit becomes the focal angle according to the distance of the reflective member;
A housing in which the transmitter and the receiver are disposed; And
It is provided in the housing and transmits terahertz wave and includes a permeable part to block the inflow of air outside the housing,
The reflective member and the object are disposed outside the housing, and the reflective member reflects terahertz waves transmitted through the object,
The transmission angle adjustment device, characterized in that the transmission portion is made of a non-polar material.
According to claim 3,
The driving unit,
And a driving motor for rotating the transmitting unit for rotating the transmitting unit, a receiving rotating unit for rotating the receiving unit, and a driving motor for rotating the transmitting rotating unit or receiving rotating unit.
According to claim 4,
The shaft of the drive motor is inserted into one of the rotating part for the transmission and the receiving rotation,
The angle of focus of the one rotating part is smaller than the diameter of the other rotating part.
The method of claim 5,
The driving unit further includes a relay rotating unit that is disposed between the transmitting rotating unit and the receiving rotating unit to transmit the driving force of the one rotating unit to the driving force of the other rotating unit,
The diameter of the one rotating part is smaller than the diameter of the relay rotating part, the focus angle adjustment device.
According to claim 3,
The control unit controls the driving unit such that an angle between the transmitting unit and the receiving unit becomes a focal angle according to the distance of the reflective member,
The transmitting unit transmits terahertz waves toward an object disposed on the reflective member, and the receiving unit receives the reflected terahertz waves,
The control unit is a focus angle adjustment device characterized in that for measuring the moisture of the object according to the intensity change of the received terahertz wave.
delete delete According to claim 3,
Focus angle adjustment device, characterized in that the water removal agent is disposed inside the housing.

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