JPH07280645A - Mobile illuminance measuring method and apparatus - Google Patents

Abstract

PURPOSE:To provide a method and apparatus for detecting a measuring point and measuring the illuminance thereat automatically while moving an illuminance meter, in which the efficiency is enhanced in the illuminance measuring work and measurement of illuminance distribution is facilitated. CONSTITUTION:The mobile measuring apparatus comprises a mobile measuring section 10 and an operational display section 20. The mobile measuring section 10 comprises an illuminance meter 14 carried on a truck 13. Number of revolutions of measuring wheels 11, 12 are detected by a rotation detector 15 and an illuminance measuring point is determined at the operational display section 20 based on a measurement of illuminance, a moving amount and a differential moving amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving illuminance measuring method and apparatus for measuring illuminance within a predetermined range while moving.

[0002]

2. Description of the Related Art Regarding the general method of measuring the illuminance of artificial lighting, its purpose and illuminance measuring method are JIS (C7).
612), according to which the purpose is to obtain basic data on whether the illuminance complies with the specified standards or standards, or to meet the design conditions, or to investigate the temporal change of the illuminance. This is done to obtain data necessary for maintenance and improvement of lighting and to compare the illuminance at each facility.

In measuring the illuminance of the artificial lighting, an operator generally stands at a predetermined point in the measurement area with an illuminance meter,
A method is used in which measurement is performed at each point according to the method specified in JIS or the like, and the obtained data is manually analyzed to estimate the illuminance distribution.

For the above-mentioned illuminance measurement, an illuminance meter which incorporates a light receiving element using a photocell and which measures the illuminance by converting the measuring light into a digital electric signal proportional to the illuminance is used.

[0005]

In general, when measuring illuminance, a measurement area is divided into several areas, an illuminance meter is used by an operator to measure the illuminance at each point, and the entire measured data is averaged. Alternatively, the average value is calculated for each specific range to obtain the illuminance value.

However, this is possible as long as the measurement range is limited and the worker can walk on foot, but the measurement range is, for example, a parking lot at an airfield or a dome shape. In an extremely large area such as a baseball field, it may no longer be possible to process all by manual measurement.

[0007] In such a vast facility, it is necessary to measure the illuminance at the time of completion of the lighting equipment in order to confirm that the lighting degree of the equipment is functioning according to the designed value. There is a demand for an illuminance measuring method that can perform the above-mentioned processing and efficiently calculate necessary illuminance values.

The present invention pays attention to various problems in the above-mentioned conventional measuring method, and measures the illuminance value while moving the measurement target area, and at the same time, measures the position of the moving measuring point to obtain the illuminance distribution. It is an object of the present invention to provide a moving illuminance measuring method and device capable of surely measuring light with high efficiency and high accuracy.

[0009]

[Means for Solving the Problems] As a means for solving the above problems, a first invention of this application is to mount an illuminance meter on a moving carriage and move the moving carriage to measure a moving distance while measuring a measuring area. The moving illuminance measuring method for continuously measuring the illuminance of

In the above measuring method, the movable carriages are moved in a measuring area along straight lines parallel to each other and at constant intervals, and the illuminance is measured at constant intervals on each straight line while measuring the moving distance. Good to do.

Further, in that case, when the movable carriage is displaced from a straight line to be moved, its position and illuminance are measured in the vicinity of the fixed interval position for measuring the illuminance, and the measured illuminance value is set to the fixed interval position. It is preferable to correct the value in 1 according to a predetermined arithmetic expression.

Further, the moving amount is measured by at least two wheel measuring wheels provided on the moving carriage, a moving angle value is obtained from this moving amount and the difference moving amount thereof, and the moving angle value is provided at the center of the two wheel measuring wheels. It is advisable to obtain the position of the illuminance meter after the shift and measure the illuminance at that position.

As an apparatus for carrying out the above measuring method,
An illuminance meter is provided in the center of the moving carriage having at least two wheels, and the rotation detector detects the rotation of the two wheels and receives the detection signal and the illuminance measurement signal from the illuminance meter. When the current position is calculated from the coordinate position calculation means, the illuminance measurement value calculation means, and the moving carriage that obtains the current position from the movement amount and the movement angle value from the reference point, the illuminance measurement value measured at the shifted position is measured at the predetermined position. The moving illuminance measuring device including the logical operation control circuit having the correction illuminance calculating means for correcting to the value of is adopted.

[0014]

In the method according to the first aspect of the invention, the moving distance and the distance between the respective measuring points are measured while the illuminance meter is moved by the moving carriage. Therefore, the illuminance is automatically recorded by the illuminometer even in a vast measurement area without manually measuring the illuminance distribution.

In the second invention, as a method of measuring the illuminance, the illuminance is measured by moving on straight lines parallel to each other and at predetermined intervals. When the measurement is performed with a constant ratio between the measurement intervals on each straight line and the parallel straight lines, the illuminance distribution is measured by dividing the measurement target region like a grid.

According to the third aspect of the invention, when the moving carriage is displaced from the straight line, the illuminance value measured at the displaced position is used to correct the illuminance value at the predetermined position by a predetermined arithmetic expression. Therefore, an accurate distribution of illuminance values can be obtained.

In the method of the fourth aspect of the invention, the above correction is carried out by measuring the amount of movement of the two wheels, and the moving angle, and hence the moving direction, is accurately calculated from the amount of movement and the amount of difference movement. The illuminance measurement value at the shifted position is corrected to the illuminance value at the predetermined position. The above correction method is performed according to the following theory.

When the illuminance is measured while moving by the moving carriage, as shown in FIG. 17, the measurement points to be finally measured are P (m-1, n-1), P (m, n-1), P (m + 1, n-1) ... P (m-1, n), P (m, n), P (m + 1, n). However, the moving carriage to be measured is actually a straight line Y
_It is not always possible to travel exactly on each of the _n-1 , Y _n, ... Straight lines, and in many cases, the measurement is made in a meandering manner as shown in the figure.

Now, suppose that the measurement points P (m-1, n), P
For each point on the straight line Y _{n of} (m, n), P (m + 1, n) ..., the point where the actual measurement is performed is D (m−1, n),
If it is D (m, n), D (m + 1, n) ..., it is necessary to correct these measured values to the values on the measurement point P.

As shown in FIG. 18, if the illuminance is measured at these two points while moving from the point (X ₀ , Y ₀ ) to the point (X, Y), the coordinates before the movement (X ₀ , The relationship between (Y ₀ ) and the coordinates (X, Y) after movement is obtained as follows. The symbols are defined as follows.

D ₁ : Moving amount and moving section length of measuring wheel 1 D ₂ : Moving amount of measuring wheel 2 L: Distance between two measuring wheels R ₁ : Radius of rotation of measuring wheel 1 R ₂ : Measuring wheel 2 Radius of rotation Q: Rotation angle (unit is radian) R ₁ × Q = D ₁ (1) R ₂ × Q = D ₂ (2) When D ₂ > D ₁ , R ₂ = R ₁ + L…. (3) From the above, the rotation angle is represented by θ = (D ₂ −D ₁ ) / L (4). When D ₂ <D ₁ , θ becomes −, so that the rotation direction can be obtained by using the above equation as it is. D ₂ , D ₁
Since the value of is actually measured, the value of the rotation angle θ can be obtained by substituting the measured value into the equation (4).

Next, assuming that the coordinates (X ₀ , Y ₀ ) before the movement are known, the coordinates (X, Y) after the movement can be obtained as follows. The coordinates (X ₀ , Y ₀ ) and the coordinates (X, Y) are the coordinate positions of the measuring device. Since the coordinate position of the measuring device is calculated by obtaining the coordinate position of the center of the measuring device, its radius is R _{0.
If, R 0 = R 1 + L} / 2 ...... (5) before the movement of the moving direction angle theta _0, when the moved to become theta from FIG _{18, X a = R 0 ·} sinθ Y a = R 0 _{· (1-cosθ) X b} = X a -Y a · tanθ 0 Y b = Y a / cosθ 0 X = X 0 + X b · cosθ 0 _{or, X = X 0 + R 0} · (sinθ- (1-cosθ ) ・ Ta
nθ ₀ ) · cos θ ₀ Y = Y ₀ + Y _b × X _b · sin θ ₀ or Y = Y ₀ + R ₀ · (1-cos θ) / cos θ ₀ + R ₀ · sin θ · sin θ ₀ −R ₀ · (1-cos θ ) · Cos θ ₀ moving direction θ _n is represented by θ _n = θ ₀ + θ.

The coordinates (X ₀ , before and after the movement, X ₀ ,
Let Y ₀ ), (X, Y) correspond to points D _{m + 1, n} , D _{m, n} in FIG. 17 _{, and if} the coordinates before the movement match beforehand, the coordinates after the movement (X _, Y) can also be obtained by the above equation. Then, the coordinate after the movement can be again determined as the coordinate before the movement, and the coordinate after the next movement can be obtained one after another by the same formula. Thus the points D _{m + 1, n} , D
The coordinates of _{m + 2, n} are obtained.

Next, as shown in FIG. 17, the points obtained as described above are slightly displaced from the measured points P _{m-1, n} , P _{m, n} . Therefore, the points D _{m-1, n} , D
Using the values of the illuminance values measured at the respective points _{m, n} ..., The values at the points P _{m-1, n} , P _{m, n} ... Which are to be obtained are corrected as follows.

The correction of the illuminance value is performed by obtaining an approximate value by a quadratic equation that passes through three measurement points.

Measuring points D _{m-1, n} , D on the three Y _n lines
_{The data of m, n} and D _{m + 1, n} are as follows.

Illuminance of D _{m-1, n} : Coordinate value of L ₁ m direction: Illuminance of X ₁ D _{m, n} : Coordinate value of L ₁ m direction: X ₂ D _{Il + 1, n} illuminance: L ₃ If the coordinate value in the m direction is X ₃ , the following simultaneous equations hold.

Ax ₁ ² + bx ₁ + c = L ₁ ax ₂ ² + bx ₂ + c = L ₂ ax ₃ ² + bx ₃ + c = L _{3 In the} above formula, x ₁ , x ₂ , x ₃ , L ₁ , L ₂ , L ₃ Is known because it is a measured value at each point, and the values of the coefficients a, b, and c are obtained by substituting the respective values. a, b, c
Once the coefficient of is determined, P is replaced by P in the above equation instead of x _1.
X of (m-1, n), P (m, n), P (m + 1, n)
Substituting the values of the coordinate lines Y _n points on P (m-1,
n), P (m, n), and P (m + 1, n) at illuminance values L ₁ , L ₂ , L ₃ corrected values are obtained. Illuminance values at each measurement point P on the carrying out the above calculation for each 3 points on the line Y _n lines Y _n is obtained all.

Then, the above calculation is performed by using the lines Y _n-1 , Y _n ,
Y _{n + 1} , Y _{n + 2} , etc. are sequentially performed to correct the Y line direction component, and then the correction value of the Y line direction component is used to similarly correct the X direction component. A corrected illuminance value L at the measurement point is obtained.

In a fifth aspect of the invention, a logical operation control circuit receives a rotation speed signal from two wheel measuring devices and an illuminance measurement signal from an illuminometer, and coordinate position calculation is performed from these signals in the control circuit. The measured illuminance value at the coordinate position deviated based on the above correction theory is corrected to the illuminance value at the predetermined position. Therefore,
It is possible to reliably execute any one of the above methods and obtain a highly accurate distribution of illuminance values extremely quickly.

[0031]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an overall schematic perspective view of the moving illuminance measuring apparatus of the embodiment. This measuring device comprises a movement measuring unit 10 and a calculation display unit 20. The movement measuring unit 10 includes an illuminance meter 14 on a moving carriage 13 having at least one wheel 11 and 12 on the left and right, and a rotation detector 15 using a rotary encoder that detects the number of rotations of the wheel 11 and 12. It has and. The moving carriage 13 is connected to the measuring automobile X by a connecting rod 13a.
Connected through. Reference numerals 18 and 19 are connection cords. The calculation display unit 20 is loaded in the automobile X at the time of measurement.

FIG. 2 is an external perspective view of the illuminance meter 14.
a is a light receiving element using a silicon photocell, b is a display panel, and c is an operation panel. The illuminance meter 14 can directly measure the illuminance by a manual operation, and the measured illuminance value (Lux) is displayed on the display panel b, but at the same time, the measurement signal is output to the outside through the connection cord 18 and the personal computer is operated. It is sent to the used electronic logical operation control circuit 20X.

FIG. 3 shows a plan view (a) and a side view (b) of the moving carriage 13 of the moving measuring unit 10. The moving carriage 13 is integrally provided with a connecting rod 13a, and the tip portion 1 thereof is provided.
6b is rotatably connected to the measuring vehicle X. Ring 1
In this embodiment, 1 and 12 are formed so that the circumference thereof is just 1 m, so that the moving carriage 13 is set to be "15 cm or less on the floor or the ground", which is the JIS standard when measuring illuminance outdoors. Has decided the height of. Also, the connecting rod 13a
Has a length of 3 m or more in the center of the two measuring wheels 11 and 12 at right angles to the axial direction of the two measuring wheels.

FIG. 4 shows the measurement side view, the overall schematic plan view (a) of the measurement vehicle X, and the side view (b).

FIG. 5 shows an overall schematic block diagram of an electric circuit of the above-mentioned measuring device. The rotation speed signals of the rotation detectors 15 and 15 are sent to the I / O port 21 of the logical operation control circuit 20X via the interface 17a and the illuminance measurement signal of the illuminance meter 14 to the central processing unit. It is temporarily stored in a temporary storage unit (RAM: random access memory) 23 in response to a command from the (CPU) 22.

Then, the storage memory is stored in a large-capacity storage unit 25 such as a floppy disk at a predetermined timing. Fixed storage (HDD: hard disk memory) 2
4 includes various calculation means a to d shown in FIG. The calculation result is displayed on the display unit 2 via the drive units 26D and 27D.
6 or printed by the printer 27. 28 is a converter, AC / DC, DC / D
The power supply voltage and current of C are changed to supply power to each part.

The illuminance is measured by the moving illuminance measuring apparatus of the embodiment constructed as described above as follows.

FIG. 7 is a flowchart mainly for recording the measurement data in the measurement data file. When the power of the measuring device is turned on, as a preparatory work, parts other than the work file and the measurement data file are initialized in step S ₀₁ , and in step S ₀₂ , overwrite / addition is determined and a new work file is created ( S ₀₃ ) or open (S ₀₄ )
Is performed. The working file is a file on the program for temporarily saving the obtained measurement data,
It is provided separately from the measurement data file. Overwriting means creating a new work file, and adding means writing data to another address of a work file that has already been used.

In step S ₀₅ , it is determined whether to stop reading the measurement data. The conditions for cancellation are
If the measurement is interrupted for some reason during the measurement, or if the predetermined area is divided into straight lines at predetermined intervals like a grid, run on that straight line for the measurement and come to the end of the measurement area and change the direction. This is a case of temporarily stopping when changing.
This stop instruction is given as an external input from the keyboard in step SS ₀₁ , and when the direction rotation input signal in step SS ₀₂ is given as an interrupt signal, the operation is interrupted even during the subsequent various calculations. The operation proceeds to the next step unless the cancellation is determined in step S ₀₅ .

In step S ₀₆ , the setting of the timing for reading the illuminance value is determined. This setting judgment is made by measuring wheel 1
When an arbitrary value of 1 m unit in which the moving distance of 1 and 12 is from 1 m to 10 m is selected, it is determined whether or not it is the set value. The set value is changed in step S ₀₇ , and if the set value is a predetermined distance, the measurement is started. The above is the preparatory operation for starting the measurement.

When the measurement is started in step S ₁ , the memory of the moving distance is reset (S ₂ ), the moving distance is read in step S ₃ , and when the moving distance reaches the set value (S ₂ ).
₄ ) Each time, a trigger signal is sent from the logical operation control circuit to the illuminance meter, and the illuminance value data is taken in at that moment in step S ₆ .

This data is serial / parallel converted in step S ₇ , the illuminance measurement value is ASCII converted in step S ₈ , and the data is written in the work file together with the line number and the measurement point number in step S ₉ . The step S ₁₀ after the data writing is incremented points No measurement point, repeat the same action as the returns to step S _2.

The above data writing operation is continuously performed over the entire measurement area (when the direction is changed in the middle, the operation is temporarily stopped, the sign of the operation is reversed and the operation is continued), and when all the measurements are completed. By the signal of step S ₀₅ , all the data in the work file are input after inputting the file name (S ₁₁ ) to the specific measurement data file (S ₁₂ ).

FIG. 8 is a flow chart for displaying the data value on the display by correcting the data after the measurement work is completed and for producing and printing the isolux curve.
Again measured data by selecting a predetermined measurement data file is read in step S _21, after conducted the sort file (sort the data in the order of the measurement points) (S _22), the two-dimensional array conversion (serial sequence replacing the data in a two-dimensional array) or manual editing is performed (S _23). Manual editing manually corrects specific abnormal data to correct measured values. Further, the data obtained in step S ₂₄ is corrected. See Figure 9 for details.
Shows the flowchart.

As shown in FIG. 9, data correction is performed in the order of coordinate position calculation, illuminance calculation, and correction calculation to correct the data. That is first respective Hakawa moving amount calculating step S of the left and right from the measurement data ₂₄₁ Hakawa 11, calculation of the moving direction is performed from the amount of movement and the difference between the moving amount in step _242, from the results Step S _{24 3}
At, the coordinate position is calculated to obtain the coordinate position before and after the movement.

When the coordinate position of the measurement point is obtained, the measured illuminance value at that coordinate position is calculated in step _S244 .
Then, the following correction calculation for the measured illuminance value is performed from the above calculation result. This correction calculation occupies an important position in carrying out the measuring method by the measuring apparatus of this embodiment, so that an accurate illuminance value at each measuring point can be obtained.

For the correction calculation, the above-mentioned arithmetic expression is used, for example, as shown in FIG.
It is applied to the case where measurement is performed while meandering as described above.

The data of each measurement point thus obtained stores the illuminance value corresponding to each coordinate point. The measurement result can be displayed on the display 26 and printed on the printer 27.

Further, since it is difficult to understand the illuminance distribution only with the above illuminance value data, it is also possible to obtain an isolux curve and display it as an isolux curve diagram in step S ₂₅ .
The isolux curve is built in accordance with the program shown in FIG. 11 and is created according to this program, but this program is an existing one, and its method will be briefly described here, and a detailed flowchart will be omitted.

In order to obtain an isolux curve, for example, 0 to 20 and 20 to 4 are applied to all data obtained at each measurement point.
The range of the illuminance value is set to 0, 40 to 60, 60 to 80 (looks). Then, first, the limit region of the maximum illuminance value in the first illuminance range (0 to 20) is obtained. This is done as follows in the illustrated example.

2 between points (X _a, Y ₁ ) to (X _b, Y ₁ ).
Find a point of 0 (looks).

₂ between points (X _a, Y ₁ ) to (X _b, Y ₂ ).
Find a point of 0 (looks).

₂ between points (X _a, Y ₁ ) to (X _b, Y ₂ ).
Find a point of 0 (looks).

The above is moved to another point and repeated in the same manner.

Thus, the points of 20 lux are connected and connected by an approximate curve. After performing the above operation for all measurement points, the level of the illuminance range is raised to the second illuminance range and the above operation is repeated. The operation ends when the set illuminance level is exceeded.

FIG. 12 is an overall schematic layout diagram when illuminance measurement is performed at a parking lot at Kansai New Airport using the moving illuminance measuring device of the above embodiment. FIG. 13 shows an enlarged view of a part of them and shows the measurement ranges when the measurement is performed by spot illumination and general illumination, respectively. Spot illumination means a case where a specific illumination light is emitted toward a specific airplane as shown in FIG.

FIG. 15 is an isolux curve diagram for general lighting,
FIG. 16 shows an isolux curve diagram in the case of spot illumination.

[0058]

[Effect] As described in detail above, in the measuring method of the first invention of this application, the illuminance is continuously measured while moving by placing the illuminometer on the moving carriage, so that the conventional work is performed. It is possible to obtain an effect that an illuminance value can be automatically measured with high efficiency at an arbitrary place, rather than having a person carry it and stop at each measurement point for measurement.

In the second invention, the illuminance is measured at regular intervals while moving on straight lines parallel to each other, and the moving distance is also measured at the same time. Therefore, the position of the illuminance measuring point and each of the points are measured. The illuminance value can be obtained while moving, and the measurement can be performed with high efficiency.

In a third aspect of the present invention, when the illuminance is measured while moving, when the vehicle deviates from the planned traveling on a straight line, the measured value at the displaced position is calculated according to a predetermined arithmetic expression as the illuminance value at the predetermined position. Since it is corrected to, the illuminance value at the predetermined position can be obtained even when the moving carriage deviates from the predetermined traveling line in the actual measurement, and since the deviation from the predetermined position occurs, it is repeated many times. It is not necessary to repeat the measurement, and it is possible to measure very quickly and highly efficiently even in a vast measurement area.

In the fourth invention, the above correction is performed by obtaining a movement angle value from the movement amount of the two wheels and the difference movement amount thereof, and using this, a deviation from a predetermined position is obtained and an illuminance measurement value is obtained at a predetermined position. The correction can be performed with extremely accurate accuracy because the value is corrected to the value in (1), and an accurate illuminance value can be obtained by practically sufficient correction.

In the fifth aspect of the invention, an illuminometer is provided on the moving carriage as a device for carrying out any of the above-mentioned measuring methods, and rotation from two wheel measuring wheels of the moving carriage is detected by a rotation detector,
Based on this signal, the moving amount and the moving angle are calculated to calculate the coordinate position, and the measuring device is provided with a calculating unit that corrects the illuminance measurement value according to the amount of deviation from the predetermined position. There are various advantages that the measuring method can be carried out reliably, and highly accurate illuminance measurement values can be measured with high efficiency and economical working cost.

[Brief description of drawings]

FIG. 1 is an overall schematic perspective view of a moving illuminance measuring device according to an embodiment.

FIG. 2 is an external perspective view of the illuminometer.

FIG. 3 is a plan view and a side view of the moving carriage.

FIG. 4 is a side view of a moving illuminance measurement of the embodiment, and an overall schematic plan view and side view of a measurement vehicle.

FIG. 5 is an overall schematic block diagram of an electric circuit of a moving illuminance measurement side view of the embodiment.

FIG. 6 is a schematic diagram of arithmetic means in a logical operation control circuit.

FIG. 7: Flow chart of illuminance measurement work

FIG. 8 is a flowchart of measurement data correction work.

FIG. 9 is a flowchart of correction calculation.

FIG. 10 is an explanatory diagram of an actual measurement point locus.

FIG. 11 is an explanatory diagram of a method of obtaining an isolux curve.

[Fig. 12] Schematic layout of the entire parking area at the airport where actual measurements were performed

FIG. 13 is a partially enlarged view of FIG.

FIG. 14 is an explanatory diagram of spot lighting.

FIG. 15: Illuminance curve diagram of general lighting

FIG. 16: Illuminance curve diagram of spot lighting

FIG. 17 is an explanatory diagram of measurement on a meandering locus.

FIG. 18 is an explanatory diagram of theoretical calculation of a meandering locus.

[Explanation of symbols]

 10 Movement Measuring Section 11, 12 Wheel Measuring 13 Mobile Carriage 14 Illuminance Meter 15 Rotation Detector 16 Connection Rod 20 Calculation Display Section 20X Logical Operation Control Circuit 22 CPU

Claims (5)

[Claims] 1. A moving illuminance measuring method in which an illuminance meter is placed on a moving carriage, and the moving carriage is moved to measure a moving distance to continuously measure the illuminance in a measurement region. 2. The moving carriage is moved along a straight line parallel to each other in an arbitrary direction and having a constant interval in a measurement area, and the illuminance is measured at a constant interval position on each straight line while measuring a moving distance. The moving illuminance measuring method according to claim 1. 3. When the movable carriage is displaced from a straight line to be moved, its position and illuminance are measured in the vicinity of a fixed interval position where the illuminance is measured, and the measured illuminance value is a value at the fixed interval position. The moving illuminance measurement method according to claim 2, wherein the correction is performed according to a predetermined arithmetic expression. 4. The moving amount is measured by at least two measuring wheels provided on the moving carriage, a moving angle value is obtained from the moving amount and the difference moving amount, and the moving angle value is provided at the center of the two measuring wheels. The moving illuminance measuring method according to claim 3, wherein a position of the illuminometer after the shift movement is obtained and the illuminance is measured at the position. 5. An illuminance meter is provided in the center of the movable carriage having at least two wheels, and the rotation detector detects the rotation of the two wheels to detect the detection signal and the illuminance by the illuminometer. When receiving a signal, the coordinate position calculation means for obtaining the current position from the movement amount and the movement angle value from the reference point, the illuminance measurement value calculation means, and the illuminance measurement measured at the displaced position when the moving carriage deviates from the predetermined position A moving illuminance measuring device comprising a logical operation control circuit having a corrected illuminance calculation means for correcting a value to a value at a predetermined position.