JPS58202849A - Measuring method of flicker of discharge lamp - Google Patents

Abstract

PURPOSE:To easily measure the degree of flicker of the light emitted from a lamp when it is lit up at 50Hz, by previously measuring the peak ratio of light outputs when the lamp is lit up at 60Hz. CONSTITUTION:A discharge lamp 6 is lit up at 60Hz to measure time-dependent fluctuations of light output emitted from the lamp within one cycle for each predetermined minute time by a photo detector 1, and the measured results are recorded in a RAM 3 of a microcomputer 2. The measured data A at the (ni) address is obtained from the RAM 3 and the data B recorded at the (ni+20) address is called up therefrom to calculate the quotient M60C of the data B divided by the data A. The relationship between the peak ratio M60 of light outputs when the lamp 6 was lit up at 60Hz and the peak ratio M50 of light outputs when it was lit up at 50Hz as well as the relationship between the peak ratio M50 of light outputs and the degree of flicker felt by men, are previously recorded in an ROM 4. The peak ratio M50 of light outputs corresponding to the above quotient M60C is called up and the degree of flicker corresponding to the M50 is also called up, thereby to indicate the same at a display 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the flickering sensation felt by humans in response to light emitted from a light source when a discharge lamp is lit with alternating current.

Generally, when a discharge lamp is lit with alternating current, two peaks with different heights occur in the light output waveform within one cycle of temporal change in the power supply voltage, and when the ratio of these peaks exceeds a certain range, humans experience flickering. I come to feel it.

As shown in Figure 1a, if the peaks of the light output waveform within one cycle of the discharge lamp are completely equal, the frequency of this light output will be twice the power supply frequency.For example, if the power supply frequency is 60 Hz, the light output will be The output frequency will be 100 hertz. As shown in FIG. 1, when the peaks of the light output waveform within one cycle of the discharge lamp are different, this light output frequency is equal to the power supply frequency.

By the way, since the maximum frequency of light output that humans feel is about 60 hertz, the discharge has temporal fluctuation characteristics of light output as shown in Figure 1.

When a lamp is lit at 50 Hz or U60 Hz, humans may experience a flickering sensation from the light emitted from this light source. The degree of flickering that humans perceive is mainly determined by (a) the frequency of the optical output.

(b) Peak ratio M of optical output shown in Figure 1 (M =
I2/I+). Here, 11 is the maximum peak optical output within one cycle of temporal change in power supply voltage,
Part 2 is the optical output that is another peak within one cycle of the temporal change in the power supply voltage.

(c) Intensity of light output It depends on the

That is, there is a tendency for flickering to be felt more strongly when the optical output frequency is 50 Hz than when the frequency is 60 Hz. Also the first
The smaller the peak ratio of optical output shown in the figure is than 1, the more flickering tends to be felt.

Therefore, the same light output peak ratio M? Even with lamps that have a 60 Hz power source, you may feel a stronger flicker when lit with a 60 Hz power source than with a 60 Hz power source, or you may not feel a flicker when lit with a 60 Hz power source. If you turn it on at 50 Hz, you may experience flickering.

The present invention focuses on the fact that there is a certain correlation between the light output peak ratio Mso when the discharge lamp is lit at 60 Hz and the light output peak ratio M6G when the discharge lamp is lit at 60 Hz. By measuring the light output peak ratio M60k under the condition of
The present invention relates to a method of measuring the degree of flickering caused by light emitted from a light source when the light is turned on at Hertz.

The measurement principle and an example of the apparatus will be explained below.

FIG. 2 shows the relationship between the light output peak ratio Mso when various discharge lamps are lit at 50 Hz and the light output peak ratio M60 when they are lit at 60 Hz. Light output peak ratio M when the discharge lamp is lit at 60 Hz
Determined by 6oK measurement, the discharge lamp is
The value was calculated by converting it to the light output peak ratio Mso when the light was lit at 0 Hz, and the relationship between the light output peak ratio Mso when the light was lit at 50 Hz and the flickering sensation felt by humans as shown in Figure 3. From this, by measuring the light output peak ratio when the discharge lamp is lit at 60 Hz, the ripple when the discharge lamp is lit at 60 Hz is ``1.''
,.

It is possible to determine the degree of feeling.

An embodiment of the measuring device according to the present invention will be fully explained below.

As shown in FIG. 4, the discharge lamp 6 is lit at 60 Hz, and the temporal fluctuations in the light output within one cycle of the light emitted from this light source are measured over a certain minute period (for example, 1/24
00 g el O) is measured by the photoreceiver 1,
The measurement results are sequentially recorded in the RAM memory 3 of the microcomputer 2. In addition, 4 in the figure is ROM memory,
6 is a display device.

As shown in Fig. 6, a microcomputer is used to obtain measurement data corresponding to the maximum value of optical output within one cycle.
From this memory address ni, the data ■ recorded in the memory (address nl+20) located 20 addresses away is called up, and the quotient M60'& of data ■ and data ■ is calculated.

The relationship between the light output peak ratio M6o when the discharge lamp is lit at 60 Hz shown in Figure 2 and the light output peak ratio Mso when the discharge lamp is lit at 5 Hz, and the light output shown in Figure 3. The relationship between the output peak ratio Mso and the flickering sensation felt by humans is recorded in advance in the ROM memory of the microcomputer (4 in Figure 4), and the quotient Ma obtained by the above calculation is calculated.

Call the optical output peak ratio Mso k corresponding to ■, and further call the degree of flicker corresponding to this Mso,
This A' (displayed on the z display device (Fig. 4, 5).

By using the light waveform measurement method described above in the present invention, it becomes possible to easily measure the degree of flicker that would occur when a discharge lamp is lit at 50 Hz while it is lit at 60 Hz.

[Brief explanation of the drawing]

FIGS. 1a and 1b are diagrams illustrating temporal fluctuation characteristics of light output when a discharge lamp is lit with alternating current. FIG. 2 is a diagram showing the relationship between the light output peak ratio when various discharge lamps are lit at 50 hertz and the light output peak ratio when they are lit at 60 hertz. FIG. 3 is a diagram showing an example of the relationship between various light output peak ratios when a discharge lamp is lit at 50 hertz and the flickering sensation that humans feel from the light. FIG. 4 is a configuration diagram of the optical waveform measuring device. FIG. 6 is a diagram for explaining the functions of this measuring device. 1... Light receiver, 2... Microcomputer body, 3... RAM memory, 4...
...ROM memory, 6...Display device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Zushikan 118 lock f 2nd figure 604vyN, pT1 Gino Mototo Kaji°-ηKNs. Figure 3 50 Hertz force J! J1%＊'lt'rivjiO-ηK
Ms. Figure 4 Figure 5 Il Valley Gate CN6o”π □. Commissioner of the Japan Patent Office 1 Display of the case 1986 Patent Application No. 86734 2 Name of the invention Method for measuring flicker in discharge lamps 3 Person making the correction Relationship with the case Patent application
Address: 1006 Kadoma, Kadoma City, Osaka Prefecture
Name (582) Matsushita Electric Industrial Co., Ltd. Representative Toshihiko Yamashita 4 Agent 571 Address 6, Matsushita Electric Industrial Co., Ltd., 1006 Oaza Kadoma, Kadoma City, Osaka Contents of the amendment (1) Page 2 of the specification Line 11 “about 60 hertz” is changed to “
Corrected to "approximately 70 hertz." ) On the 3rd page, line 4, change ``Depends on.'' to ``
It depends on etc. ” will be corrected. ) On page 6, lines 8 to 9, ``Figure 5 ~ 1 cycle'' is changed to ``Figure 5 shows the RAM when the light output of a discharge lamp lit at 60 Hz is measured at a time interval of 1/2400860.'' This is a diagram showing the contents of the memory.In this case, one cycle of the optical waveform consists of 40 pieces of data.Correct it to "This one cycle"0 Correct the quotient M60■ to ``.

Claims (1)

[Claims] Measure the light output waveform of the discharge lamp lit at 60 Hz, calculate the peak ratio of the two light outputs within one cycle of the light output waveform obtained using this formula, and use this peak ratio to calculate the peak ratio of the two light outputs within one cycle of the discharge lamp lit at 50 Hz. A method for measuring flicker in a discharge lamp, comprising converting the light output to a light output peak ratio when the light output is reduced, and determining the degree of flicker perceived by a human from the converted light output peak ratio.