JP2003057105A - Vibration meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration meter that can be easily corrected in time. SOLUTION: The portable type vibration meter 1 provided with a vibration measuring means (detector 20) measuring the vibration of a measuring object, in which an internal clock (clock 14), is provided with a time signal acquiring means (antennas 5a, 6a 7a) acquiring a time signal from an exterior by wireless, and a calibrating means (CPU 2) calibrating the time of the internal clock based on the time signal acquired by the time signal acquiring means. In addition, the time signal acquiring means is provided with a plurality of antennas, receiving means (receivers 5, 6, 7) receiving time signals in a plurality of different frequency bands placed at every antenna, and a switching means (a switch 4) selectively switches one receiving means from among a plurality of the receiving means to output the time signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrometer for measuring vibration of an object to be measured.

[0002]

2. Description of the Related Art There are various forms of vibrometers, and one of them is a small-sized vibrometer that is equipped with a detector that serves as a sensor for detecting vibration and a display unit that displays the detection result of this detector. A handheld vibrometer is known. In such a vibrometer, the measurer brings a part of the detector into contact with the measurement object to measure the vibration of the measurement object, and the measurement result is displayed on the display unit. The vibrometer is equipped with an internal clock so that the time is displayed on the display.

In the above-mentioned conventional vibrometer, the time is corrected by
This method is generally performed by operating a push button or the like provided on the housing of the vibrometer to manually set or correct the standard time of a television or radio.

Further, recently, based on the internal clock of a personal computer which has taken in the standard time on the Internet or the like, the personal computer and the vibrometer are connected by a communication cable or the like to correct the internal clock of the vibrometer.

[0005]

However, in the former method, since the time is manually adjusted, it takes time, and since it is done manually, a slight deviation from the actual standard time occurs at the operation stage. . Further, when the time is corrected by using a personal computer or the like like the latter, the connection between the personal computer and the vibrometer is complicated, and the work is troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibrometer which has been made in view of the above circumstances and which can easily adjust the time.

[0007]

The invention according to claim 1 is
For example, as shown in FIG. 2, in a portable vibrometer 1 equipped with a vibration measuring means (detector 20) for measuring the vibration of an object to be measured, an internal clock (clock 14) and a time signal from the outside are wirelessly transmitted. Time signal acquisition means (antenna 5)
a, 6a, 7a) and a calibration means (CPU2) for calibrating the time of the internal clock based on the time signal acquired by the time signal acquisition means.

According to the first aspect of the invention, in the portable vibrometer 1 equipped with the vibration measuring means for measuring the vibration of the measuring object, the time signal acquiring means wirelessly acquires the time signal from the outside. However, the calibrating means calibrates the time of the internal clock based on the time signal.

Therefore, the time can be adjusted more accurately than in the conventional case where the time is manually adjusted.

According to a second aspect of the present invention, for example, as shown in FIG. 2, the time signal acquisition means comprises a plurality of antennas.
Receiving means (receivers 5, 6, 7) for receiving time signals of a plurality of different frequency bands provided for each antenna, and one receiving means from among the plurality of receiving means are selectively switched, And a switching unit (switch 4) for outputting a time signal.

According to the second aspect of the present invention, since the switching means is provided, it is possible to arbitrarily select one antenna from the plurality of antennas and select the most suitable receiving means for signal reception. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic front view showing the external appearance of a vibrometer 1 according to an embodiment of the present invention. 2 is a block diagram for explaining the outline of the internal configuration of the vibrometer 1.

First, the external structure of the vibrometer 1 will be described.
The vibrometer 1 includes a box-shaped case 1a, and
A display unit 9 and an input unit 8 are provided on the front surface of the case 1a,
Further, a detector 20 for detecting vibration is provided on the upper end of the case 1a.
Is equipped with. Further, a plurality of antennas (5a, 6a, 7a) extend from the upper part of the case 1a so that radio waves from satellites or the ground can be received.

Next, the internal structure of the vibrometer will be described. In FIG. 2, the vibrometer 1 includes a CPU 2, a receiver (5, 6, 7) as a receiving unit, a switch 4 as a switching unit, a detection signal amplifier 30, and an A / D converter 4.
0, input unit 8, display unit 9, ROM 10, RAM
11, a clock 14, and an antenna (5a, 6a, 7a) are roughly configured.

CPU (Central Processing Unit) 2
Is an IPL (Initial Program) stored in the ROM 10.
ram Loader) program, time calibration processing program, etc., and the processing result is temporarily stored in the work memory area in the RAM 11 and displayed on the display unit 9.

As the time calibration process, the CPU 2 calibrates the time of the timepiece 14 based on the time signals input from the respective antennas (5a, 6a, 7a), and vibrates based on the 1-second pulse of the time signals. The clock signals related to the internal operation of the total 1 are synchronized.

A plurality of antennas (5a, 6a, 7a) are provided and receive radio waves in a plurality of frequency bands from the outside. In this embodiment, a GPS antenna 5a, a JJY antenna 6a, and an FM antenna 7a are provided.

The GPS antenna 5a receives radio waves transmitted from GPS satellites. The radio wave (frequency 1575.42 MHz) transmitted from the GPS satellite is a signal synchronized with the atomic clock (error of 1 / million second) in the satellite. J
From the JY antenna 6a, short wave (frequency 2.5-15M
Hz) and long wave (frequency 40 kHz) of two standard radio waves. The standard time signal is 1 using a cesium beam atomic frequency standard and a practical cesium beam atomic clock group.
The precision is maintained at the order of × 10 ^-13 . From the FM antenna 7a, FM waves (frequency 7
The time signal of 6.0 to 90.0 MHz) is received.

Here, the correlation between the time signal and the clock signal related to the internal operation will be described with reference to FIG.
FIG. 3A is a diagram showing a schematic waveform of a 1-second pulse of a time signal, and FIG. 3B is a diagram showing a schematic waveform of a clock signal relating to an internal operation of the vibrometer 1. In FIG.
The time signal is a signal that transits between H level and L level in a cycle of 1 second, and the L level signal further includes a signal representing time information and the like. The clock signal is a vibrometer 1.
Of the internal operation of the CPU 2, for example, a signal of several MHz to several hundred MHz which is the operating frequency of the CPU 2. In FIG. 3, 5 Hz is shown for simplicity.

The receivers (5, 6, 7) are functional modules built in the vibrometer 1 and each antenna (5a, 5a,
The time signal is extracted from the signals received by 6a, 7a) and output to the switch 4. In this example,
Corresponding to each antenna (5a, 6a, 7a), three types of receivers, a GPS receiver 5, a JJY receiver 6, and an FM receiver 7, are built in. The GPS receiver 5
May calculate and output the position information and the altitude information based on the received GPS signal.

The switch 4 is a changeover switch for connecting each receiver and the CPU 2, and each antenna (5a, 6)
a, 7a) to switch the time signal received from the CPU
Output to 2. The switch 4 is interlocked with the input unit 8 of the front panel of the vibrometer 1, and by operating the input unit 8, the type of the antenna (5a, 6a, 7a) to be received is selected.

The input unit 8 is composed of input keys and the like for inputting various set values and the like.
Output to 2. The input unit 8 is provided with a time adjustment button 8a for starting the time adjustment process. The display unit 9 is composed of an LCD (Liquid Crystal Display) or the like, and provides a real-time measurement value when vibration is measured,
Display the current time.

ROM (Read Only Memory) 10 is a CP
In addition to the IPL program executed by U2 when the vibrometer 1 is started, initial setting values of various processing programs are stored.

The RAM (Random Access Memory) 11 is
A buffer area for temporarily storing measurement data constantly input from the detector 20 via the detection signal amplifier 30 and a work memory area for storing various data relating to various processes such as time calibration process are formed. There is.

The clock 14 is composed of a quartz clock or the like with a small error, and in the recording process executed by the CPU 2, the time recorded in association with the measurement data is indicated by CP.
Output to U2. Further, the time of the timepiece 14 is calibrated based on the time signal by the time calibration processing executed by the CPU 2.

The detector 20 detects the vibration of the measuring object as an analog electric signal, and outputs the detected analog electric signal to the detection signal amplifier 30. The detection signal amplifier 30 amplifies the electric signal, which is an analog signal transmitted from the detector 20, and outputs it to the A / D converter 40. A
The / D converter 40 converts the amplified electric signal (analog signal) into measurement data, which is a digital signal expressed numerically as a vibration value, and outputs the measurement data to the CPU 2.

Next, the operation related to the time calibration process will be described. The time adjustment is started by first pressing the time adjustment button 8a of the input unit 8 on the front panel of the vibrometer 1. Then, a message prompting the selection of the GPS antenna 5a, the JJY antenna 6a, and the FM antenna 7a is displayed on the display unit 9 of the vibrometer 1. When the GPS antenna 5a is selected by the input unit 8, the fixed terminal 4a of the switch 4 and the connection terminal 5b of the GPS receiver 5 are connected.

Then, the time signal obtained by the GPS receiver 5 is output to the CPU 2 from the GPS signal received by the GPS antenna 5a. Then, the CPU 2
Based on this time signal, the time of the timepiece 14 is calibrated and the clock signal related to the internal operation is synchronized with the time signal. Similarly, when the JJY antenna 6a is selected, the fixed terminal 4a of the switch 4 and the connection terminal 6b of the JJY receiver 6 are connected, and the JJY receiver 6 obtains from the JJY signal received by the JJY antenna 6a. The time signal is output to the CPU 2. Further, when the FM antenna 7a is selected, the fixed terminal 4a of the switch 4 is
, The connection terminal 7b of the FM receiver 7 is connected, and the time signal acquired by the FM receiver 7 is output to the CPU 2 from the FM signal received by the FM antenna 7a.

As described above, the vibrometer 1 to which the present invention is applied.
Since it is configured to be able to receive a time signal from the outside by radio, it is possible to automatically calibrate the internal clock (clock 14). Therefore, it is not necessary to adjust the time via the personal computer, and the working time can be shortened. In addition, multiple receivers (5, 6,
7) has a built-in built-in receivable antenna (5a, 6a,
Since 7a) can be selected, even if one antenna cannot be received, the other antennas (5a, 6a, 7a) can be switched and received, so that the time can be surely adjusted.

The present invention is not limited to the contents of the above-mentioned embodiment, but can be modified as appropriate without departing from the spirit of the present invention. For example, in the above embodiment, the number of receiving antennas (5a, 6a, 7a) is three.
Although the number of the antennas used is not limited to this, one or a plurality of antennas may be used.

The antennas (5a, 6) described above are also used.
The configuration in the vibrometer 1 may be changed so that the switching of a) and 7a) is automatically performed. In this case, a plurality of antennas (5a, 6a,
7a) currently selected antenna (5
a), 6a, 7a), the standard time information is not obtained from the reception by the antennas (5a, 6a) by the switch 4.
a, 7a) is automatically switched, and the antennas (5a, 6a, 7a) for which the standard time information is obtained are searched. Therefore, when the standard time information cannot be obtained in the frequency band of one antenna, another frequency that can obtain the standard time information is searched, so that the time can be corrected with high probability.

Further, the time adjustment may be carried out at predetermined time intervals by a timer, or when the receiving means is an FM receiver, it may be carried out when an FM broadcast receiver outside the receiver is activated. Good. In this way, the time of the clock is corrected based on the standard time information in the character multiplex broadcast, and an accurate time can always be obtained without presetting the time.

[0034]

According to the first aspect of the invention, in the portable vibrometer 1 equipped with the vibration measuring means for measuring the vibration of the object to be measured, the time signal acquisition means wirelessly transmits the time signal from the outside. The calibration means calibrates the time of the internal clock based on the time signal. Therefore, the time can be adjusted more accurately as compared with the conventional case where the time is manually adjusted.

According to the invention described in claim 2, since the switching means is provided, it is possible to arbitrarily select one antenna from the plurality of antennas and select the receiving means most suitable for receiving the signal.

[Brief description of drawings]

FIG. 1 is a schematic front view showing the appearance of a vibrometer 1.

FIG. 2 is a block diagram showing an internal configuration of a vibrometer 1 to which the present invention is applied.

FIG. 3A is a diagram showing a schematic waveform of a 1-second pulse of a time signal. FIG. 3B is a diagram showing a schematic waveform of a clock signal related to the internal operation of the vibrometer 1.

[Explanation of symbols]

1 Vibration meter 2 CPU (calibration means) 4 switches (switching means) 5 GPS receiver (receiver) 6 JJY receiver (receiver) 7 FM receiver (receiver) 5a GPS antenna (time signal acquisition means) 6a JJY antenna (time signal acquisition means) 7a FM antenna (time signal acquisition means) 8 Input section 9 Display 10 ROM 11 RAM 14 clock (internal clock) 20 Detector (vibration measuring means) 30 Detection signal amplifier 40 A / D converter

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshio Tozawa             2-7-1 Hironodai, Zama City, Kanagawa Prefecture             Ceremony company Akashi Sagami Factory F term (reference) 2F002 AA05 BB02 BB04 FA16 GA04                 2G064 AB23 BA14

Claims (2)

[Claims] 1. A portable vibrometer equipped with vibration measuring means for measuring the vibration of an object to be measured, comprising an internal clock, a time signal acquiring means for wirelessly acquiring a time signal from the outside, and the time signal acquiring means. A vibrometer, comprising: a calibration unit that calibrates the time of the internal clock based on the time signal acquired by the unit. 2. The time signal acquiring means includes a plurality of antennas, a receiving means provided for each antenna to receive time signals of a plurality of different frequency bands, and one receiving means from among the plurality of receiving means. 2. The vibrometer according to claim 1, further comprising: switching means for selectively switching the means to output a time signal.