JPS6122281A - Optical distance measuring device having self-checking function - Google Patents

Abstract

PURPOSE:To enable rapid maintenance on a measuring site, by storing a program for checking the function of each part of an optical distance measuring device in a memory apparatus and allowing a microprocessor to perform the function check of each part to display the same. CONSTITUTION:All operational programs are stored in the fixed memory apparatus of memory 68 and a microprocessor 46 successively reads said programs to perform the same. The program for checking the function of each part of an apparatus is also contained in said programs and a mode change-over switch 48 is set to a test mode to drive the apparatus and, at first, the checking of an in ternal light quantity level is performed in an internal mode. Subsequently, AGC function is operated to check whether the light quantity level is normal and data is subjected to operation processing by the microprocessor 46 to perform the judgement of irregularity. Next, the internal mode is changed over to an external mode to check whether the lght quantity level is equal to or more than a prescribed value and normal or abnormal display is performed to be informed to an operator.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light wave distance meter having a self-check function.

Conventionally, various light wave distance meters are known. However, there was no system that automatically checked the functions of each part of the light wave rangefinder and displayed the location of any defects. In the past, if an abnormality occurred in a light-wave distance meter during a survey using a light-wave distance meter, the operator at the site had no choice but to stop the survey.

This is because the operator lacks specialized knowledge about the inside of the light-wave distance meter, and only the manufacturer or a specialized repair person can check the light-wave distance meter and repair any malfunctions. However, the electric device of a light wave distance meter is constructed by combining printed circuit boards, and even an amateur can easily repair it by simply replacing the faulty printed circuit board once the fault location is known.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a light wave distance meter that automatically checks the functions of each part and simultaneously displays a plurality of defective locations on a display. As a result, the operator can refer to the check results displayed on the display and the malfunction indications 1 to 1 and 1 (
By checking the printed circuit board when a failure occurs, the printed circuit board can be replaced and maintenance can be carried out quickly at the measurement site. Therefore, it is possible to continue surveying on the optical distance side without abandoning the survey plan.

In the light wave distance meter according to the present invention, a program for checking the functions of each part of the light wave distance ^1 is programmed in the storage device, and the microprocessor executes the program according to the program stored in the storage device. A function check is performed on each part on the optical distance side, and the results are displayed on the display device. In a preferred embodiment of the present invention, the check program is fixedly recorded in the device, and each time the microprocessor performs a function check of each part, the check result is written in the second record (, l). Temporarily record it in the device, and after all function checks are completed, display all the check results at once on the display device. Then, give different values to each check target, and the values are different from each other. The relationship is such that the cumulative value does not match the numerical value, and the plurality of function check data is displayed on the display device as the cumulative value of the recorded value.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a light wave distance meter according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a schematic configuration of a light wave distance meter. In the light wave distance meter shown in FIG.
Generates signals with three frequencies of 1z, 15MIIz and 7
A 5 KHz signal is supplied to the light emitting diode 14 via the changeover switch 12. The light emitted from the light emitting diode 14 is passed through the chopper 1 controlled by the arithmetic and control unit 16.
8 into an external optical path 20 and an internal optical path 22. The light directed to the external optical path 20 is reflected by a reflective mirror, such as a prism 24, placed at the target and passes through the variable optical attenuator 2.
6 is received by the light receiving diode 28 , while the light passing through the internal optical path 22 is also received by the light receiving diode 28 via the variable optical attenuator 26 . The light from the light receiving diode 28 is supplied to a mixer 30. The mixer 30 receives a 3.75 KI+z low frequency signal from the light-emitting diode 14 sent from the synthesizer 34 via the changeover switch 32 controlled by the arithmetic and control unit 16, and receives the signal from the light-receiving diode 28. It is mixed with the signal, converted into a received signal of 3.75 Kllz, and outputted to the phase measuring device 36. The phase measuring device 36 further receives a signal of 3.75 K11z as a reference signal from the transmitter 10 and outputs a phase difference signal between the received signal and the reference signal to the arithmetic and control unit 16. The aforementioned synthesizer 34 is
Receives signals of three frequencies from the transmitter 10, 14.99
The signals of 625MIIz and 71.25K11z are output to the changeover switch 32.

Next, the operation will be schematically explained. First, selector switch 12
and 32 are switched from the position shown in FIG.
1 group is sent (long wavelength mote) and chopper 18
is forming an external optical path, a phase difference array between the received signal from the mixer 30 and the reference signal from the transmitter 10 is output from the phase measuring device 36 to the arithmetic and control device 16. Find the count value corresponding to the phase difference,
Remember. Next, even during the period when the chopper 18 is forming the internal optical path, the arithmetic control unit 16 calculates and stores a count value corresponding to the phase difference signal based on the phase difference signal between the received signal and the reference signal. Thereafter, the arithmetic and control device 16 calculates the difference between the two stored values and calculates the distance based on the difference.

In the case of measurement using a long wavelength signal of 75KIIz, 1/10
When measured with an accuracy of 2000m, the distance is 2000m.
It can be measured with a resolution of cm.

Next, the changeover switches 12 and 32 are switched to the upper position as shown in FIG. 1, and the light emitting diode 14 is energized with a signal having a frequency of 15M1lz (short wavelength mode).

Then, as in the case of 75KIIz, the count values corresponding to the phase differences are calculated and stored for each of the external optical path and the internal optical path, and the distance is calculated based on the difference. 15MI
In the case of measurement using a short wavelength signal of Iz, 1/1'0000
It is possible to measure distances up to 10 m with a resolution of 1 mm. Then, the two measured values obtained in this manner are combined, for example, by correcting the measured value obtained in the long wavelength mode, which is 10 m or more, with the measured value obtained in the short wavelength mode. Distances up to 2 km can thereby be measured with an accuracy of 11 m.

In the above operation, two or more measurements, for example, five measurements, are performed in each of the long wavelength mode and short wavelength mode, and the difference between the maximum value and minimum value of the five measured values is within a predetermined tolerance value. A check is made to see if the value exists, and if it is within the allowable value, the average of the five measured values is calculated and the average value is taken as the measured value for that mode. If the difference between the maximum and minimum values exceeds the allowable value, the maximum and minimum values are rounded down, two more measurements are taken, and the two new measurements are combined with the previous three remaining measurements. The maximum value and minimum value are extracted from among them, and the above-described process is repeated again.

For details on the basic configuration of a light wave distance meter, see U.S. Patent No. 3,619.058 and Japanese Patent Application Laid-Open No. 1983-130.
Please refer to No. 67.

FIG. 2 is a block diagram of the arithmetic and control unit 16 of FIG. 1. The phase difference signal from phase measurement device 36 is applied to one input of AND gate 40 .

The other input of the AND gate 40 is connected to, for example, 15MI from the oscillator 10 in order to count the pulse width of the phase difference signal.
The Iz signal is supplied as clock signal A. AN
The output of the D gate is applied to an up/down counter 42. Phase measuring device 36 further applies a timing pulse synchronized with the reference signal to timing counter 44 . The timing counter 44 has a timing counter of, for example, 20
When the timing pulse of 0 is counted, the phase measuring device 3
6 to stop the phase measuring device 36 from outputting the phase difference signal to the AND gate 40. Additionally, timing counter 44 outputs an interrupt signal to microprocessor 46 when the count reaches 200.

The microprocessor 46 is provided with a mode changeover switch 48 for selecting a test mode, a rough measurement mode, and a precision measurement mode, and a meter/feet changeover switch 50 for selecting a distance display unit. Data is input via the bus 46a, control signals are output via the data bus 46a and the output port 54, and display data is directly output to the display device 56.

An offset switch 58 is connected to the input boat 52 via a gate 60 and a PPM switch (weather correction switch) 6
2 is connected through a gate 64, and an external optical path light amount level signal and an internal optical path light amount level signal are connected through a gate 66, respectively. The microprocessor 46 further includes a memory 6 such as a fixed memory memory (ROM).
A memory 70, such as a random access memory (RAM), is provided. The output of the up/down counter 42 is connected to the input port 52 and the data bus 46.
The data is input to the memory 70 via a, and is written as #. The memory 68 is programmed with a program to be executed by the microprocessor 46.

Gates 60, 64 and 66 and up/down counter 42 are connected to data bus 4 by microprocessor 46.
．． 6a, controlled via output port 54 and decoder 72. Additionally, the microprocessor 46 has a data bus 46a, an output port 54, and a bus amplifier 74.7.
Operating signals are output to the buzzer 80, the drive motor 82 of the chopper 18, and the changeover switches 12 and 32 through the switches 6 and 78, respectively.

The display device 56 includes an address counter 86, an address selector 88, and a memory 90, such as a random access memory.
, a decoder/driver 92, an I/ED display 94 consisting of, for example, seven display elements, an address decoder 96,
Further, drive amplifiers 98 and 100 are provided. The address counter 86 receives a clock signal B from a clock pulse generator (not shown) and outputs an address signal corresponding to each display element of the LED display 94 at a constant cycle. Data to be displayed is input via data bus 46a to an address in memory 90 specified by address selector 88, which receives the address signal of microprocessor 46 from memory 70, and is stored therein. When a series of data is thus transferred from the memory 70 to the memory 90 and stored, the memory 90 at the address specified by the address selector 88 receives the periodically changing address signal from the address counter 86. The data is sequentially read out and output to a decoder/driver 892, where it is converted into a signal of the type that drives the LED display, output to each display element of the LED display 94, and , the read decimal point information is input to the LP, D display 94 via the amplifier 98. On the other hand, an address decoder 96 that receives an address signal from the address counter 86 sequentially drives each display element of the LED display specified by the address signal at high speed, and transfers the data from the memory 90 to the LED display. Display it.

Next, the operation of the apparatus shown in FIG. 2 will be explained. All programs for the operations described below are stored in the fixed storage device of the memory 68, and are sequentially read out and executed by the microprocessor 46.

Now, when the mode selector switch 48 is set to the test mode and the apparatus is started, the processes shown in FIGS. 3A to 3C are executed. When the test mode starts, the buzzer 80 is first reset, and then the address of the memory 70 where test data is to be stored is specified. For example, address Xo is specified. Then, the short wavelength mode is set, and the changeover switches 12 and 32 are switched to the short wavelength mode via the output port 54 and the amplifier 78. Furthermore, it is set to internal mode and output port 5
A drive signal is provided to motor 82 via 4 and amplifier 76, and internal optical path 22 is established by chopper 18. There, we checked the internal light level,
When the level is normal, zero is stored at address Xo in the memory 70, and when the level is below the reference value, 1 is stored.
At the same time, in order to store the next data, the address number is decreased by one, that is, address (Xo-1).
Specify.

Next, the AGC function (not shown) is operated to check whether the ζ light amount level is normal. This AGC function check takes advantage of the fact that in internal mode, the input signal level of the AGC circuit is within the specified level range due to the circuit configuration, and the control voltage of the AGC [1lil path is within the corresponding range. We are determining whether or not there is. If normal,
Zero is stored in the address (Xo-1) of the memory 70, 2 is stored in the case of a defect, and the next address (Xo-2) is specified. After that, the counter count is checked in the short wavelength mode in the internal mode, and if it is normal, zero is input to the address (Xo -2) of the memory 70, and if it is defective, 4 is input and the next address (Xo -2) is input.
Xo-3).

This counter counting check is performed by counting 200 phase difference signal names in the internal optical path using the counter 42 and storing them in the memory 70 during the internal light intensity level check and AGC function check.
These two pieces of data are subjected to arithmetic processing to determine the dispersion.

Next, the internal mode is switched to the external mode, and it is checked whether the light intensity level is above the specified value. If it is above the specified value, the buzzer 80 is sounded to signal to the operator that the light wave distance meter and prism 24 are illuminated. On the other hand, if the value is below the specified value, the buzzer 80 is muted to signal that the target is not aimed, and the process proceeds to the next step. In that step, it is checked whether it is in long wavelength mode, and if it is not in long wavelength mode, it switches to long wavelength mode, returns to step B of FIG. Check the light level. If it is normal, input a zero to the address (Xo-3) of the memory 70, if it is defective, input a 1 and move to the next address (Xo-3).
Xo-4). Next, the AGC function is checked on the internal optical path in the long wavelength mode, and the result is stored in the address (Xo-4) of the memory 70.

Thereafter, a count check of the counter is performed using the internal optical path in the long wavelength mode, and if it is normal, zero is input to the address (Xo-5), and if it is defective, 4 is input. Next, it is switched to the external mode, it is checked whether the light intensity level is -1- or less than the specified value, it is checked whether it is in the long wavelength mode, and if it is in the long wavelength mode, it proceeds to the next step. That is, it is checked whether the offset inch 58 is normal, and if it is normal, zero is input to the address (Xo-6) of the memory 70, and if it is defective, 2 is input. This off-sen 1-- switch check is to check whether each digit is "9" or less by using the same switch in a BCD coat. Next, the PPM switch 62 is checked, and if it is normal, zero is input into the address (Xo-7) of the memory 70, and if it is defective, 1 is input. This PPM switch is checked by using the fact that the switch is a rotary switch and only one contact is ON, and when two or more contacts are connected or none of them are connected. is considered an error.

After that, check the mode switch 48, and if it is normal, address (X) of the memory 70.

-8) is stored as zero, and if it is defective, 2 is stored.

This mode switch check uses a 3-mode toggle switch, and when one contact is connected,
It is in test mode, and when the other is connected, it is in coarse measurement mode, and when both are not connected, it is in precision measurement mode. Therefore, if both are connected, an error will occur.

Next, it is checked whether the meter/feet changeover switch 50 is normal, and if it is normal, the address (X
Zero is stored in o-9), and 4 is stored in case of failure. This meter/feet switch check uses a two-mode toggle switch; if one is connected, it's a meter, and if the other is connected, it's a foot. Therefore, if both are not connected, an error will occur.

Finally, check whether the values stored in addresses Xo to (Xo-9) are all zeros, and if they are all zeros, enter the address "8" in the memory 90 that corresponds to each digit on the display 94. Then, all seven digit display elements of the LED display display "8", and each display element is checked at the same time.

If the stored values at addresses Xo to (Xo-9) are all non-zero, the following calculation is performed.

M(Xo-9) 10M(Xo-8)+M(Xo-7)
-M(D7) ・-=+11M(Xo-6)+M(X
o-5) +M(Xo-3) -M(D6) -...+
21M(Xo-2)+M(Xo-1)+MXo=
M(Ds) −−+31 Then, the calculation result of formula (1) is stored in the address D of the memory 90 corresponding to the display element of the most significant digit of the LED display 94, and,
The calculation results of equations (2) and (3) are made to correspond to the display elements of the second and third digits from the top of the LED display 94. Addresses D6 and D5 of the memory 90 are respectively written with 1α, and the result of the check is displayed on the upper three digits of the LED display 94. FIG. 4 shows the relationship between the numerical value of each digit and the check result. The numerical value of the defect display is 1.2.4, and there are no combinations of 2 or 3 sums that take the same value, so it is possible to make the operator aware that something is defective (for example, R150J). If it is displayed, PP
It can be seen that there is a defect in the M switch, a decrease in the amount of light in the internal optical path in the long wavelength mode, and a defect in the counter counting result in the internal optical path in the long wavelength mode. In addition, as the number of failure indications increases, for example, indication 6 is a combination of 2 and 4, and indication 7 is a combination of 1, 2, and 4. can be instantly recognized.

Since it is sufficient to check the AGC function in short wavelength mode, checking in long wavelength mode may be skipped. Further, although the check results are displayed as three-digit numbers, they may be displayed separately on nine display elements. Furthermore, the targets of the function check can be selected arbitrarily.

Next, the operation when the mode selector switch 48 is switched to the precision measurement mode will be explained. Note that for measurements in coarse measurement mode, measurements are performed twice each in precision measurement mode and long multiple wavelength mode, and after determining reliability, the first measurement value of each wavelength is processed ( That is, the average value is not calculated), so it will be omitted. (In addition, in the rough measurement mode, the measurement process is not displayed.) In the precision measurement mode, the measurement program set in the memory 68 is divided into five measurement processes.
In the measurement process, five distance measurements are carried out in long wavelength mode, in the second measurement process the reliability of the five measurements in long wavelength mode is determined and the average value is determined, and in the third measurement process the short and long distance measurements are determined. Five distance measurements are carried out in wavelength mode, in a fourth measurement process the reliability of the five measurements in short wavelength mode is determined and the average value is determined, and in a fifth measurement process in long wavelength mode. Digit alignment and combination processing is performed between the average value of the measured values and the average value of the measured values in the short wavelength mode, and the measured values can be displayed completely.

More specifically, as shown in the flowcharts of FIGS. 5A to 5C, at the start of the precision measurement mode, a display timer (not shown) is first reset. This display timer is used to set the time during which the distance measurement value is displayed, and is set so that the time required for normal measurement in precision measurement mode is approximately 6 seconds when displaying the measurement value on the display 94. . If the measurement conditions are poor and the time required for measurement exceeds 6 seconds, the display timer is reset, the display of the previous measurement value is erased, and the measurement process currently being executed is displayed on the display 94.

Next, the measurement process number is written to u1'' and recorded in the memory 70 to 4M.Then, the long wavelength mode is set and the buzzer 8o is held in the reset state.Then, the reset state of the display timer is confirmed at T11. Then, the measurement process is displayed on the LIED display 94. That is, in this state, the measurement process number is 1, and for example, the measurement process is displayed on the LIED display 94.
An energizing signal is outputted to the location of the memory 9o corresponding to the decimal point of the lowest digit of the display 94 based on the memory 70 to cause the decimal point of the lowest digit of the LED display 94 to light up. . This indicates to the operator that the first measurement process is currently being executed. next,
Set to external mode, phase difference of external mode measurement is counted. This is done by the timing counter 44 as described above.
For example, a count value corresponding to the pulse width of 200 phase difference pulses is obtained and temporarily stored. After that, during the counting period, it is checked whether the amount of external light is appropriate. If it is defective, the memory is erased, and the phase difference is counted again in external mode measurement. If it is appropriate, it is switched to internal mode. It will be done. and,
The phase difference in the internal mode is counted and temporarily stored,
The difference between the count value in the external mode and the count value in the internal mode is determined and stored in the memory 70 as actual distance data.

Next, it is determined whether the actual distance data stored in the memory 70 has reached 5 pieces, and if the number has not reached 5 pieces, the process returns to the external mode set again as shown in FIG. 5A, and the actual distance data is stored. The measurement-calculation process is repeated. When the number reaches 5, "+1" is added to the measurement process number and the measurement process number stored in the memory 70 is "2".
shall be. Then, check the reset status of the display timer and display the measurement process. At this time, the memory in the memory 90 is erased, and 1 from the lowest digit of the LED display 94
An energizing signal is outputted and stored in the memory 90 at a location corresponding to the decimal point of the next higher digit based on the memory in the memory 70, and the decimal point of the LED display 94 one higher than the lowest digit is It will be turned on. Then, in order to judge the reliability of the measurement results, that is, the variation, the maximum value and minimum value are selected from among the five pieces of actual distance data stored in the memory 70, and the selected maximum value and minimum value are It is determined whether the difference is less than or equal to the allowable value ε. If the tolerance value ε is exceeded, the maximum and minimum values stored in the memory 70 are deleted, "-1" is added to the measurement process number, and the fifth
Returning to E in Figure A, repeat the measurement two more times in the long wavelength mode. Therefore, at this time, the decimal point of the least significant digit of the LED display 94 is lit again. When the difference between the maximum value and the minimum value is less than the allowable value ε, the average value of the five * distance data is calculated and stored in the memory 70, and then "+1" is added to the measurement process number.

After that, it is determined whether the short wavelength mode measurement has been completed, and if it has not been completed, the mode is switched to the short wavelength mode, and the process returns to E in Fig. 5A, and the five actual distances are measured in the short wavelength mode. Find the data and find the average value. During measurement in the short wavelength mode, the decimal point in the last third digit of the LED display 94 lights up, and during the dispersion determination and average value calculation of the five actual distance data in the short wavelength mode, the LED indicator 94 lights up. The decimal point in the fourth lower digit of the D display 94 is lit.

When the measurement in the short wavelength mode and the calculation of the average value are completed in this way, the measurement process is displayed as shown in FIG. 5C, and the decimal point at the fifth digit from the bottom of the LED display 94 lights up. be done. Then, it is determined as follows whether digit matching and combining of the average values of the actual distance data in the long wavelength mode and short wavelength mode stored in the memory 70 is possible, and the digit matching and combining is executed.

As mentioned above, the measurement range in long wavelength mode is O
, 1999.8 m from Orn, and the measurement range of the short wavelength moat' is from 0.000 m to 9.999 m. Therefore, in the digit matching and combination, the numerical values of the m-unit digits of the data obtained in the quantity mode are compared and corrected so that the two match. However, if the amount of correction is large, the measurement data is considered to be unreliable, so in that case, discard all measurement data, return to G in Figure 5A, and execute the entire measurement process again. . For example, if the maximum correction amount is limited to 2 m, and the value in units of m for long wavelength data and m for short wavelength data are
When the difference from the unit value is 2 m or less, the shorter wavelength data is given priority and both data are combined. For example, if the long wavelength data average value is 110.6 m and the short wavelength data average value is 8.215 m, the combined value is 108.2 m.
The length shall be 15m.

After completing the digit alignment and combination in this manner, offset/sight correction and PPM correction are applied to the composite value, and if necessary, meter/feet exchange is performed.

Then, the display timer is set, the buzzer 80 is set and the buzzer sounds to notify the operator that the measurement has been completed, the measured value is transferred to the memory 3, and the L E D
It is displayed on the display 94.

The relationship between the execution of the measurement process as described above and the display of the measurement process being executed by the LED display is shown in FIG.

Also, instead of lighting up the decimal point as shown in FIG. 6, as shown in FIG.
It is also possible to light up the central horizontal segments of the display elements of the ED display sequentially starting from the lowest one. In this case, it is possible to give the impression that the illuminated horizontal bar of the LED indicator is extending as the measurement process progresses. Furthermore, as shown in FIG. 8, the number of lit decimal points can be increased. Furthermore, as shown in FIG. 9, the number of the measurement process in progress may be displayed in the lowest digit.

Alternatively, the measurement process may be divided into three instead of five, the first measurement process and the second measurement process may be combined into one, and the third measurement process and the fourth measurement process may be combined into one. . Conversely, it is also possible to display the executed measurement process by dividing the measurement process into six or more, for example seven.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of a light wave distance meter, FIG. 2 is a block diagram showing a configuration of an arithmetic and control unit in FIG. 1, and FIGS. A flowchart of the operation when the optical distance meter shown in the figure is in the test mode, FIG. 4 is a diagram showing the display mode of the check result in the test mode, and FIGS. The flowchart of the operation of the precision measurement mode of the light wave distance meter shown in the figure, and FIGS. 6, 7, 8, and 9 are diagrams showing the measurement process display mode, respectively. 10... Transmitter 12.32... Changeover switch 1
4... Light emitting diode 16... Arithmetic control device 1
8... Chopper 20... External optical path 22... Internal optical path 24... Prism 26... Variable optical attenuator 28... Light receiving diode 30... Mixer
34... Synthesizer 36... Phase measuring device 43... Asop down counter 44... Timing counter 46... Microprocessor 94... LED display Patent applicant Tokyo Kogaku Kikai Co., Ltd. ■■ Town and '5 ゝ(. To Ryoshichi ℃0

Claims (2)

[Claims] (1) In a light wave distance meter that measures distance according to pre-programmed steps and has a display section that displays the measured data, performs a function check of each part of the light wave distance meter, and temporarily stores the check data in a storage device. The check data is stored and each of the check data corresponds to a predetermined numerical value, and the cumulative value of the corresponding numerical values is in a relationship that does not match the above numerical value, and the plurality of function check data are displayed on the display section as the cumulative value of the numerical value. A light wave distance meter with a self-check function, characterized in that multiple function checks can be recognized at the same time. (2) The self-check function according to claim 1, characterized in that a plurality of cumulative values of numerical values indicating the plurality of function check data are obtained and displayed on a plurality of digits of the display section. A light wave distance meter.