CN115126978A - Portable wireless optical frequency detector - Google Patents

Portable wireless optical frequency detector Download PDF

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Publication number
CN115126978A
CN115126978A CN202210754738.1A CN202210754738A CN115126978A CN 115126978 A CN115126978 A CN 115126978A CN 202210754738 A CN202210754738 A CN 202210754738A CN 115126978 A CN115126978 A CN 115126978A
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China
Prior art keywords
arc
ring
frequency detector
shaped
sides
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Granted
Application number
CN202210754738.1A
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Chinese (zh)
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CN115126978B (en
Inventor
苏义
张荣国
朱涛
王瑶
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Erlei Instrument Equipment Co ltd
Original Assignee
Xuzhou Zhigu Optical Frequency Industry Research Institute Co ltd
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Priority to CN202210754738.1A priority Critical patent/CN115126978B/en
Publication of CN115126978A publication Critical patent/CN115126978A/en
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Publication of CN115126978B publication Critical patent/CN115126978B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/18—Heads with mechanism for moving the apparatus relatively to the stand
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/20—Undercarriages with or without wheels
    • F16M11/22—Undercarriages with or without wheels with approximately constant height, e.g. with constant length of column or of legs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M7/00—Details of attaching or adjusting engine beds, frames, or supporting-legs on foundation or base; Attaching non-moving engine parts, e.g. cylinder blocks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Abstract

The invention provides a portable wireless optical frequency detector, which relates to the technical field of portable optical frequency detectors and comprises the following components: the inside both sides of body frame have an expansion bracket through the cooperation of transfer line sliding connection respectively, and two link top positions are fixed connection in arc below both sides position respectively. According to the portable wireless optical frequency detector provided by each embodiment of the invention, the two telescopic frames are driven by the transmission rod to extend and retract, so that the overall size of the device can be changed conveniently, and when the two telescopic frames are in a retracted state, the overall size of the device can be reduced conveniently.

Description

Portable wireless optical frequency detector
Technical Field
The invention relates to the technical field of portable optical frequency detection instruments, in particular to a portable wireless optical frequency detector.
Background
The absolute frequency measurement of the optical frequency refers to frequency measurement directly based on cesium atom reference frequency, and when the cesium atom reference frequency is measured, a person is required to conveniently carry a detector, so that the optical distance, the wavelength and other aspects of various places can be conveniently measured.
However, most of the conventional portable optical frequency detectors are handheld when detecting the optical frequency, and have a large error in equidistant measurement, and the portable optical frequency detectors need to be carried and placed at specific positions, and need to be unfolded at a single position when being folded, which is cumbersome.
Disclosure of Invention
In view of the above, the present invention provides a portable wireless optical frequency detector, which has a main frame, and can be expanded and contracted simultaneously, thereby achieving a higher efficiency and an anti-tipping effect.
The invention provides a portable wireless optical frequency detector, which specifically comprises: a main frame;
the body frame is U word shape, and the inside both sides of body frame is a link of fixedly connected with respectively, and two links are the symmetry and set up, and the inside intermediate position of body frame rotates and is connected with the transfer line, and the transfer line body of rod is provided with the screw thread, and the inside both sides of body frame have an expansion bracket through the cooperation of transfer line sliding connection respectively, and two link top positions are fixed connection in arc below both sides position respectively.
Optionally, the two expansion brackets are symmetrically arranged, the front and rear positions of the outer ends of the two expansion brackets are respectively and rotatably connected with a support plate, each support plate is in an L shape, and the support end position of each support plate is elastically connected with a support leg.
Optionally, when the four support plates are in a closed state, the support legs of the support plates are attached to the lower wall of the interior of the main frame, and the four support plates are attached to the two sides of the front end and the rear end of the main frame.
Optionally, the arc is semicircular, and the u-shaped groove has been all seted up to the rear end both sides, the both sides position of arc rear end top respectively with precision ring front end both sides position fixed connection, the precision ring outer peripheral face is provided with the latch, and precision ring top plain noodles position is provided with the angle value scale, precision ring and arc constitute the annular shape jointly.
Optionally, two side positions below the rear end of the arc-shaped plate are respectively fixedly connected with two side positions of the front end of the auxiliary ring, the auxiliary ring is located right below the precision ring, the precision ring and the auxiliary ring are respectively located at the upper end and the lower end of the U-shaped groove of the arc-shaped plate, and the middle position of the precision ring and the middle position of the auxiliary ring are slidably connected with the adjusting piece.
Optionally, the adjusting part is in an I shape, arc-shaped grooves are formed in the upper end and the lower end of the adjusting part respectively, the precision ring is located in the arc-shaped groove in the upper end of the adjusting part, and the auxiliary ring is located in the arc-shaped groove in the lower end of the adjusting part.
Optionally, the rear end of the adjusting part is fixedly connected with the front end of the driving motor, the top of the driving motor is rotatably connected with a gear through a rotating shaft, and the gear is meshed with the latch on the outer peripheral surface of the arc-shaped plate.
Optionally, an L-shaped extension frame with an adjustable up-down distance is arranged at the front end of the adjusting piece, the front end of the extension frame is arranged at the rear end of a detection instrument, and the detection instrument is arranged at the inner side of the precision ring.
Has the advantages that:
according to the portable wireless optical frequency detector provided by each embodiment of the invention, the two telescopic frames are driven by the transmission rod to extend and contract, so that the overall size of the device can be changed conveniently, and when the two telescopic frames are in a contracted state, the overall size of the device can be reduced conveniently.
In addition, the driving motor drives the gear to rotate when rotating, the gear is meshed with the clamping teeth of the precision ring, so that the whole adjusting piece performs semicircular movement at the position below the peripheral surface of the precision ring, the movement track of the adjusting piece is limited by the positions of the auxiliary ring and the adjusting piece, the movement angle range of the adjusting piece is determined according to the angle value on the precision ring, the rotation amplitude of the detecting instrument can be determined, data information of the optical frequency end of the detecting instrument at different positions with equal distance can be counted, and the conditions that most optical frequency detectors are in handheld detection and have large errors when in equidistant measurement are avoided.
In addition, when being closed state according to four extension boards, the inside lower wall position of the stabilizer blade laminating body frame of extension board, and the both sides position of four extension board laminating body frame front and back end is in closed state at four extension boards, can restrict the horizontal position extension of expansion bracket, avoids the mistake to touch the transfer line and leads to the expansion bracket position to change, and on the other hand is in open state when four extension boards, and the stabilizer blade of extension board pops out to this point of application that increases the stabilizer blade of extension board.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
The drawings in the following description relate to some embodiments of the invention only and are not intended to limit the invention.
In the drawings:
FIG. 1 is a schematic diagram illustrating an expanded front view of a radio frequency detector according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an expanded left-view configuration of a radio-frequency detector in accordance with an embodiment of the present invention;
FIG. 3 is an exploded top view of a radio frequency detector according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing an expanded side view of the wireless optical frequency detector according to the embodiment of the present invention, in which the position of the support leg of the support plate can be clearly seen;
FIG. 5 is a schematic diagram illustrating a front view of a storage structure of the wireless optical frequency detector according to the embodiment of the invention;
FIG. 6 is a schematic diagram illustrating a storage left-view structure of the wireless optical frequency detector according to the embodiment of the invention;
FIG. 7 is a schematic diagram showing a side view of a receiving structure of the wireless optical frequency detector according to the embodiment of the invention;
FIG. 8 illustrates an expanded side view schematic of a radio-frequency detector mainframe according to an embodiment of the present invention;
fig. 9 is a schematic view of a combined structure of the arc-shaped plate, the adjusting member and the detecting instrument according to an embodiment of the present invention, in which the scales of the angle values of the position of the adjusting member, the latch arranged on the outer peripheral surface of the precision ring and the position of the top smooth surface of the precision ring can be clearly shown;
FIG. 10 is a side view of the three adjusting members according to the embodiment of the present invention, which clearly shows the shape of the adjusting members and the arc-shaped grooves at the upper and lower ends;
list of reference numerals
1. A main frame; 101. a connecting frame; 102. a transmission rod; 103. a telescopic frame; 104. a support plate; 2. an arc-shaped plate; 201. a precision ring; 202. an auxiliary ring; 3. an adjustment member; 301. a drive motor; 302. a gear; 303. an extension frame; 4. and (5) detecting the instrument.
Detailed Description
In order to make the objects, aspects and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. Unless otherwise indicated, terms used herein have the ordinary meaning in the art. Like reference symbols in the various drawings indicate like elements.
The first embodiment is as follows:
please refer to fig. 1 to 10: the invention provides a portable wireless optical frequency detector, which comprises: a main frame 1; the body frame 1 is U word shape, and the inside both sides of body frame 1 are connecting frame 101 of fixedly connected with respectively, and two connecting frames 101 are the symmetry and set up, and the inside intermediate position of body frame 1 rotates and is connected with transfer line 102, and the transfer line 102 body of rod is provided with the screw thread, and the inside both sides of body frame 1 have a expansion bracket 103 through the cooperation of transfer line 102 sliding connection respectively, and two connecting frame 101 top positions are fixed connection in 2 below both sides positions of arc respectively.
In addition, according to the embodiment of the present invention, as shown in fig. 8, two expansion brackets 103 are symmetrically disposed.
In addition, according to the embodiment of the present invention, as shown in fig. 9, the arc-shaped plate 2 is a semicircular ring shape, two sides of the rear end of the arc-shaped plate are both provided with u-shaped grooves, two sides of the upper portion of the rear end of the arc-shaped plate 2 are respectively fixedly connected with two sides of the front end of the precision ring 201, and the outer peripheral surface of the precision ring 201 is provided with latches.
In addition, according to the embodiment of the present invention, as shown in fig. 9, the adjusting part 3 is in an i shape, and the upper and lower ends of the adjusting part 3 are respectively provided with an arc-shaped groove, the precision ring 201 is located in the arc-shaped groove at the upper end of the adjusting part 3, and the auxiliary ring 202 is located in the arc-shaped groove at the lower end of the adjusting part 3.
Further, according to the embodiment of the present invention, as shown in fig. 8, the front end position of the adjusting member 3 is provided with an L-shaped extension 303 whose up-down distance is adjustable, the front end position of the extension 303 and the rear end position of the detecting instrument 4, and the detecting instrument 4 is located at the inner side position of the precision ring 201.
The specific use mode and function of the embodiment are as follows: in the invention, when the device is carried to be unfolded and fixed, a user rotates the transmission rod 102, the transmission rod 102 rotates to drive the expansion brackets 103 on two sides in the main frame 1 to synchronously extend in opposite directions, so that the expansion brackets 103 are unfolded, when the main frame 1 is integrally placed on the ground, the dispersed contact area of the whole weight of the device is increased through the extension of the two expansion brackets 103, the arc-shaped plate 2 above the main frame 1, the adjusting piece 3 and the detecting instrument 4 are supported, and then the position distance of the light frequency is detected through the detecting instrument 4.
Example two:
based on the radio frequency detector that portable that first embodiment provided, though carry out horizontal position extension to body frame 1 through two expansion brackets 103, increase the horizontal stress point of body frame 1, possible support position extends, but when body frame 1 wholly receives fore-and-aft effort, the condition of empting appears in body frame 1 wholly very probably, and then portable's radio frequency detector is still including: the front and back positions of the outer ends of the two telescopic frames 103 are respectively and rotatably connected with a support plate 104, each support plate 104 is L-shaped, the supporting end position of each support plate 104 is elastically connected with a support leg, when the four support plates 104 are in a closed state, the support legs of the support plates 104 are attached to the inner lower wall position of the main frame 1, and the four support plates 104 are attached to the two side positions of the front and back ends of the main frame 1;
when the expansion bracket 103 is in a contraction state, the lower wall positions inside the expansion bracket 103 are attached to the support legs of the support plates 104, before the expansion bracket 103 is adjusted by rotating the transmission rod 102, the support plates 104 at the two ends of the two expansion brackets 103 are firstly rotated, the support plates 104 at the two ends of each expansion bracket 103 are linear, when the support legs of the support plates 104 are not attached to the main frame 1, the support plates 104 are in an extension state according to the elastic action of the support plates 104, the length of the support plates 104 extending is the same as the bottom height of the expansion bracket 103, the front end position and the rear end position of the expansion bracket 103 are reinforced in an auxiliary mode, the situation that the main frame 1 longitudinally topples over is avoided, meanwhile, the support plates 104 can also be adjusted in self-adaptive height according to different geographical positions, and the situation of uneven ground is coped with.
Example three:
based on the second embodiment provide a portable's wireless optical frequency detector, though can avoid the whole condition that appears longitudinal position and topple over of body frame 1 to take place, but when detecting the optical frequency position, can't carry out the detection of equidistance position, will carry out the position deviation that appears when the optical frequency detects in different angular position, and then portable's wireless optical frequency detector is still including: the smooth surface position at the top of the precision ring 201 is provided with an angle value scale, and the precision ring 201 and the arc plate 2 jointly form a circular ring shape.
In addition, according to the embodiment of the present invention, as shown in fig. 9, two side positions below the rear end of the arc-shaped plate 2 are respectively and fixedly connected with two side positions of the front end of the auxiliary ring 202, the auxiliary ring 202 is located right below the precision ring 201, the precision ring 201 and the auxiliary ring 202 are respectively located at the upper and lower end positions of the u-shaped groove of the arc-shaped plate 2, and the adjusting member 3 is slidably connected between the precision ring 201 and the auxiliary ring 202.
In addition, according to the embodiment of the present invention, as shown in fig. 9, the rear end position of the adjusting member 3 is fixedly connected to the front end of the driving motor 301, the top position of the driving motor 301 is rotatably connected to the gear 302 through the rotating shaft, and the gear 302 is engaged with the latch on the outer circumferential surface of the arc-shaped plate 2.
The optical frequency end required to be detected is arranged at the central position in a circular ring formed by the precision ring 201 and the arc plate 2 together, then the driving motor 301 is started, the driving motor 301 drives the gear 302 to rotate, and when the gear 302 rotates, the gear 302 is meshed with the clamping teeth on the outer peripheral surface of the arc plate 2, so that the whole regulating part 3 slides at the gap position between the precision ring 201 and the auxiliary ring 202, and the regulating part 3 is prevented from separating from the middle position between the precision ring 201 and the auxiliary ring 202 when moving according to the position limitation of the precision ring 201 and the auxiliary ring 202.
Finally, it should be noted that, when describing the positions of the components and the matching relationship between the components, the invention will be generally exemplified by one/a pair of components, however, it should be understood by those skilled in the art that such positions, matching relationship, etc. are also applicable to other components/other pairs of components.
The above description is intended to be illustrative of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims.

Claims (8)

1. A portable radio frequency detector, comprising: a main frame (1); the U-shaped main frame (1) is in a U-shaped shape, two connecting frames (101) are fixedly connected to two sides of the inside of the main frame (1) respectively, the two connecting frames (101) are symmetrically arranged, a transmission rod (102) is rotatably connected to the middle position of the inside of the main frame (1), a rod body of the transmission rod (102) is provided with threads, two telescopic frames (103) are slidably connected to two sides of the inside of the main frame (1) through the matching of the transmission rod (102) respectively, and the top positions of the two connecting frames (101) are fixedly connected to two sides of the lower portion of the arc-shaped plate (2) respectively.
2. A portable radio frequency detector as defined in claim 1, wherein: the two telescopic frames (103) are symmetrically arranged, the front and rear positions of the outer ends of the two telescopic frames (103) are respectively and rotatably connected with a support plate (104), each support plate (104) is L-shaped, and the support end position of each support plate (104) is elastically connected with a support leg.
3. A portable radio frequency detector as defined in claim 2, wherein: when the four support plates (104) are in a closed state, the support legs of the support plates (104) are attached to the inner lower wall of the main frame (1), and the four support plates (104) are attached to the two side positions of the front end and the rear end of the main frame (1).
4. A portable radio frequency detector as defined in claim 1, wherein: arc (2) are half-circular ring form, and the rear end both sides have all been seted up the U-shaped groove, the both sides position on arc (2) rear end top respectively with precision ring (201) front end both sides position fixed connection, precision ring (201) outer peripheral face is provided with the latch, and precision ring (201) top plain noodles position is provided with the angle value scale, precision ring (201) and arc (2) constitute the annular shape jointly.
5. The portable radio frequency detector as set forth in claim 4, wherein: the two sides of the lower part of the rear end of the arc-shaped plate (2) are fixedly connected with the two sides of the front end of the auxiliary ring (202) respectively, the auxiliary ring (202) is positioned right below the precision ring (201), the precision ring (201) and the auxiliary ring (202) are positioned at the upper end and the lower end of a U-shaped groove of the arc-shaped plate (2) respectively, and the middle positions of the precision ring (201) and the auxiliary ring (202) are connected with an adjusting piece (3) in a sliding mode.
6. A portable radio frequency detector as defined in claim 5, wherein: the adjusting part (3) is I-shaped, arc-shaped grooves are formed in the upper end and the lower end of the adjusting part (3) respectively, the precision ring (201) is located in the arc-shaped groove in the upper end of the adjusting part (3), and the auxiliary ring (202) is located in the arc-shaped groove in the lower end of the adjusting part (3).
7. A portable radio frequency detector as defined in claim 6, wherein: the rear end position of the adjusting piece (3) is fixedly connected with the front end of the driving motor (301), the top position of the driving motor (301) is rotatably connected with a gear (302) through a rotating shaft, and the gear (302) is meshed with the clamping teeth on the outer peripheral surface of the arc-shaped plate (2).
8. A portable radio frequency detector as defined in claim 7, wherein: the front end position of the adjusting piece (3) is provided with an L-shaped extension frame (303) with adjustable vertical distance, the front end position of the extension frame (303) and the rear end position of the detection instrument (4) are arranged, and the detection instrument (4) is positioned at the inner side position of the precision ring (201).
CN202210754738.1A 2022-06-30 2022-06-30 Portable wireless optical frequency detector Active CN115126978B (en)

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CN202210754738.1A CN115126978B (en) 2022-06-30 2022-06-30 Portable wireless optical frequency detector

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CN202210754738.1A CN115126978B (en) 2022-06-30 2022-06-30 Portable wireless optical frequency detector

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CN115126978B CN115126978B (en) 2024-01-09

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2193462A5 (en) * 1972-07-20 1974-02-15 Marini Lionello
KR200444323Y1 (en) * 2009-01-14 2009-05-07 (주)한국해외기술공사 Check-up apparatus for safety diagnosis of crack length of pier bridge
CN210372676U (en) * 2019-08-20 2020-04-21 兰州定辉电子科技有限公司 Security protection supervisory equipment
CN114002404A (en) * 2021-10-22 2022-02-01 上海市建设机械检测中心有限公司 Nondestructive testing equipment and method for steel structure engineering quality
CN114198617A (en) * 2021-12-13 2022-03-18 浙江省邮电工程建设有限公司 Communication machine room monitoring and management system
CN216219179U (en) * 2021-10-09 2022-04-08 王瑶 Folding municipal trees support frame

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2193462A5 (en) * 1972-07-20 1974-02-15 Marini Lionello
KR200444323Y1 (en) * 2009-01-14 2009-05-07 (주)한국해외기술공사 Check-up apparatus for safety diagnosis of crack length of pier bridge
CN210372676U (en) * 2019-08-20 2020-04-21 兰州定辉电子科技有限公司 Security protection supervisory equipment
CN216219179U (en) * 2021-10-09 2022-04-08 王瑶 Folding municipal trees support frame
CN114002404A (en) * 2021-10-22 2022-02-01 上海市建设机械检测中心有限公司 Nondestructive testing equipment and method for steel structure engineering quality
CN114198617A (en) * 2021-12-13 2022-03-18 浙江省邮电工程建设有限公司 Communication machine room monitoring and management system

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