JPH04283630A - Spectroscopic measuring apparatus - Google Patents

Abstract

PURPOSE:To realize a simple spectroscopic measuring apparatus whose measuring speed is quick. CONSTITUTION:The light from a light source to be measured 4 is so received with a monochromatic photodetector and reference photodetector 1 that the monochromatic lights of narrow bands of 420nm, 460nm, 490nm and 650nm reference light of 545nm. The amounts of the received lights are digitized in an A/D converter 2. The ratios between the amounts of four monochromatic received lights and the amount of the received reference light are obtained in a operator 3. The ratios are compared with the ratio which is obtained for every kind of the light source beforehand, and the kind of the light source is judged. The instability of the illuminance of the light source is avoided by using the relative amounts of received lights, and the measurement can be performed in a short time.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectrometer for determining the types of various types of fluorescent lamps.

0002

2. Description of the Related Art In recent years, lighting equipment has developed and there are many types, one of which is a fluorescent lamp.

[0003] In the manufacturing process of fluorescent lamps, various types of lamps are manufactured at the same time, and each type of lamp has
The product number will be printed after completion. In a subsequent process, it may be necessary to automatically determine the type of lamp. Since then, there has been a method of image processing in which characters and symbols printed on lamps are imaged using a video camera.

0004

Problems to be Solved by the Invention In such conventional devices, there have been problems in that the image processing takes time for discrimination, the discrimination speed is not sufficient, and the cost of the device is high.

[0005] The present invention solves the above-mentioned problems and aims to provide a simple spectrometer with high discrimination speed.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention, as a first means of solving the problem, receives light from a light source to be measured, and includes a wavelength range of 41 within the wavelength range of the received light.
0-430nm, 445-475nm and 480-500
monochromatic light receiving means that separates and receives light from 630 to 670 nm and obtains an output corresponding to the amount of received light, and a standard for obtaining an output corresponding to the amount of light received in a narrow band near any one wavelength in the received wavelength region. comprising a light receiving means, an A/D converting means for converting into numerical values the outputs of the monochromatic light receiving means and the reference light receiving means, and a calculating means for performing calculations upon receiving the output of the A/D converting means, the calculating means Ratios R1, R2, R3, and R of the amount of received light in each wavelength range and the reference amount of received light
4, and compares the values with the ratios R1n, S2n, S3n and S4n determined in advance for each type of light source, thereby determining the type of the light source to be measured. , as a means of solving the second problem, receiving the light of the light source to be measured,
Among the receiving wavelength ranges, the wavelength ranges are 410-430 nm, 445-475 nm, 480-500 nm, and 630-6.
A monochromatic light receiving means that separates and receives light of 70 nm and obtains an output corresponding to each received light amount, a photometric light receiving means that measures and outputs the relative value of the received light amount, and A that converts each of the above outputs into numerical values. /D conversion means, and calculation means for performing calculations upon receiving the output of the A/D conversion means, and the calculation means calculates the ratio R between the amount of received light in each wavelength range and the output of the photometric light receiving means.
1, R2, R3, and R4, and the ratio R1n obtained in advance for each type of light source.
, R2n, R3n, and R4n, respectively, to determine the type of light source to be measured.As a means for solving the third problem, the monochromatic light receiving means and the reference light receiving means are replaced with a photodiode array. Claim 1 comprising a continuous interference filter disposed over the entire surface of the filter in which the wavelength of transmitted light changes continuously with respect to the incident position in the visible light band.
As the spectrometer described above, and as a fourth problem solving means,
The monochromatic light receiving means consists of a photodiode array and a continuous interference filter disposed in front of the photodiode array, in which the wavelength of transmitted light changes continuously with respect to the incident position in the visible light band. In the spectrometer according to claim 2, the relative illuminance value is determined from the output using a standard luminous efficiency function.

[0007]

[Operation] With the above configuration, the present invention extracts and measures only the components in the above four wavelength bands out of the spectral power distribution of the lamp to be measured, and uses these values at a specific wavelength (545 nm).
It is expressed as a measured value (near m) or a ratio of the photometric amount to the measured value, and the type of lamp to be measured is determined from the value of these ratios.

[0008] The above four wavelength bands are the parts that particularly well represent the characteristics of the spectral distribution of various fluorescent lamps (the fluorescent emission part excluding the mercury emission line), and are the wavelength bands of the reference receiver (54
5 nm) is a wavelength (typical mercury emission line) that has strong power in any fluorescent lamp, and by selecting these wavelengths, many types can be identified without error using measured values of a small number of wavelengths.

[0009]

Embodiments (Embodiment 1) Hereinafter, a spectroscopic measurement apparatus according to an embodiment of the first problem-solving means of the present invention will be described with reference to the drawings. FIG. 1 shows, in a block diagram, the configuration of a spectrometer according to an embodiment of the first problem-solving means of the present invention. In the figure, 1 is a group of monochromatic light receivers, each of which has wavelengths of 420 nm, 460 nm, 490 nm, and 545 nm.
, has sensitivity in a narrow band around 650 nm. 2 is A/D
In the converter group, 3 is an arithmetic unit, and 4 is a fluorescent lamp to be measured. Each photoreceiver in the photoreceiver group 1 has a narrow band spectral sensitivity with a half width of about 20 nm. Further, as the fluorescent lamp 4 to be measured, all types of fluorescent lamps (excluding those for ultraviolet and infrared radiation) including colored fluorescent lamps are targeted. Column of light source name in (Table 1)

[0010]

[Table 1]

The types (29 types) of fluorescent lamps to be measured in this example are shown below. Further, FIG. 2 graphically shows an example of the spectral power distribution of the fluorescent lamp to be measured.

The interrelationship and operation of the above components will be explained. First, the light receiver group 1 receives the spectral radiation power of the lit fluorescent lamp 4 to be measured. Here, the output of each receiver in receiver group 1 is set to V420 and V46, respectively.
0, V490, V545, and V650. Each of these outputs is digitized by the A/D converter group 2 and sent to the arithmetic unit 3. Here, when the fluorescent lamp to be measured is turned on for a short time during the manufacturing process, it is difficult to stably reproduce its emission intensity, and when the emission intensity changes, the output of the light receiver group 1 also changes. Therefore, the calculation device 3 first calculates the measured values V420, V460, V490, and V65 of each wavelength.
0 and the measured value V545 at 545 nm, R420
=V420/V545, R460=V460/V545
, R490=V490/V545, R650=V650
/V545. By determining the ratio in this manner, changes in the lighting state of the fluorescent lamp 4 to be measured can be offset.

[0013] Next, this R420, R460, R49
0 and R650 are determined in advance by experiment or calculation for 29 types of fluorescent lamps.
=1,2,. ．． ．． , 29 for R420(i), R4
60(i), R490(i), and R650(i) are stored in the arithmetic device 3. In the arithmetic unit 3, first, R46
By comparing 0 and R460(i), we narrow down candidate product types with sufficient noise margin in mind. Next, the candidate varieties are compared for other wavelengths of 460 nm, 490 nm, and 650 nm, and the varieties are determined from those that match in each case. If the discrimination time is not an issue, the product type can be discriminated by comparing in any order, but in the case of this example, 460n
When starting from m, the variety could be determined with the least number of comparisons. (Table 1) assumes that lamps whose R460 values differ by more than ±20% (considered as noise margin) can be distinguished, and lamps that can be distinguished are ○, and lamps that cannot be distinguished are ○.
This is shown in . For example, in the case of lamp 11 (three-wavelength fluorescent lamp 1), looking at the 11th row horizontally, lamps 01 to 10 cannot be distinguished from lamps 01 and 05, and the 11th row Viewed vertically, lamps 12-2
It can be seen that all cases 9 can be discriminated. The type of lamp 15 and lamp 25 can be determined only by the R460 value. Even if the type cannot be determined by R460, all types of the 29 types of fluorescent lamps shown in (Table 1) can be identified by sequentially using data of other wavelengths (R420, R490, R650).

[0014] The four wavelengths (420 nm, 4
60nm, 490nm, 650nm) are wavelengths of 410-430nm, 445-475nm, 480-480nm, respectively.
These wavelengths were used as representative wavelengths within each region of 500 nm and 630 to 670 nm. As shown in Figure 2, various types of fluorescent lamps have various spectral distribution curves, but the four wavelength regions mentioned above are the mercury emission line (406 nm, 4
This is a wavelength range between 36 nm, 546 nm, and 578 nm), in which almost all the target fluorescent lamps have emission energy, and excludes the part where the spectral distribution curve is steep. By selecting these wavelength ranges, all types of fluorescent lamps can be identified accurately with the least number of receivers. Furthermore, by avoiding a steep portion of the spectral distribution curve, it is possible to suppress errors caused by changes in the spectral response of the light receiver.

(Embodiment 2) A spectroscopic measuring device according to an embodiment of the third problem-solving means of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing the configuration of a spectrometer according to an embodiment of the third problem-solving means of the present invention. In the figure, 1 is a photodiode array, 2 is a continuous interference filter fixed in front of the photodiode array 1, 3 is an amplifier group, 4 is an A/D converter group, 5 is an arithmetic unit,
6 is a fluorescent lamp to be measured. The continuous interference filter 2 has a spectral transmission band over the entire visible range, and is set to have a characteristic that the wavelength of transmitted light changes continuously at the incident position due to the interference effect. for example,
This is a filter in which the transmission wavelength changes from 400 nm to 700 nm as the incident position moves from the upper end to the lower end of the filter 2 shown in the figure. The diodes of the diode array arranged at the rear of the filter 2 all have the same characteristics, but because of their different positions relative to the filter, they receive different wavelengths of light. The receiving wavelength is 410 nm to 430 nm, 445 nm to 475 nm, or 4 as described in Example 1.
By selecting and using diodes at positions corresponding to 80 nm to 500 nm and 630 nm to 670 nm, the output of each bit of each photodiode array 1 has a narrow band spectral sensitivity with a half-value width of about 20 nm in the wavelength range. Become. Further, as the fluorescent lamp 6 to be measured, fluorescent lamps of various types are used as in the first embodiment.

The interrelationship and operation of the above components will be explained. When the photodiode array 1 receives light from the illuminated fluorescent lamp 6 to be measured through the continuous interference filter 2, each bit of the photodiode array 1 outputs a signal corresponding to the spectral power distribution of each wavelength of the incident light. This signal is amplified into a voltage signal by the amplifier group 3, digitized by the A/D converter group 4, and the output value is sent to the arithmetic unit 5.

The arithmetic unit 5 selects wavelengths of around 420 nm, around 460 nm, and around 490 nm among the sent measurement values.
Take out the measured values of wavelengths near, 545 nm, and 650 nm (V420, V460, V490, V650), and calculate the ratio of these values and the measured value of 545 nm, V545, as R420=V420/V545, R460=V460
/V545, R490=V490/V545, R650
= R650/V545. Thereafter, the types of the 29 types of fluorescent lamps to be measured can be determined by the same operation as in the first embodiment.

(Embodiment 3) A spectroscopic measurement apparatus according to an embodiment of the second problem-solving means of the present invention will be described below with reference to the drawings. FIG. 4 is a block diagram showing the configuration of a spectrometer according to an embodiment of the second problem-solving means of the present invention. In the figure, in the photoreceiver group 1 in the configuration of Example 1,
A photometric photoreceiver 7 is provided in place of the photoreceiver sensitive to wavelengths around 545 nm. The photometric photodetector 7 is a photodetector whose spectral response is approximated to standard luminous efficiency, and outputs relative values of illuminance and luminous flux.

If the output of this photometric photoreceptor 7 is V0, then
The output of each receiver of monochromatic light receiver group 1 is set to V42.
0, V460, V490, and V650, the ratio of these values to V0 is R420=V420/V0, R46
0=V460/V0, R490=V490/V0, R6
50=V650/V0. by this,
Even if the lighting intensity of the lamp 4 to be measured changes, the change in the light receiver output due to the change in the amount of light can be canceled out.

Thereafter, the types of the 29 types of fluorescent lamps to be measured can be determined by the same operation as in the first embodiment.

(Embodiment 4) Hereinafter, a spectroscopic measurement apparatus according to an embodiment of the fourth problem-solving means of the present invention will be described with reference to the drawings. In this embodiment, the configuration of the second embodiment shown in FIG. 3 is used, and the output of each bit of the photodiode array 1 is input into the arithmetic unit 5 through the A/D converter group 4. The photometric quantity V0 is determined by multiplying by the function.

In the arithmetic unit 5, among the measured values sent from the A/D converter group 4, the wavelength of around 420 nm, 460 nm
Take out the measured values of wavelengths around nm, around 490 nm, and around 650 nm (V420, V460, V490, V650), and calculate the ratio of these values and V0 as R420=V42
0/V0, R460=V460/V0, R490=V4
90/V0, R650=R650/V0. Thereby, even if the lighting intensity of the lamp 4 to be measured changes, the change in the light receiver output due to the change in the amount of light can be canceled out.

Hereinafter, by the same operation as in the first embodiment,
The types of 29 types of fluorescent lamps to be measured can be determined.

As described above, according to the spectrometer of the embodiment of the present invention, the amount of light received at a specific wavelength is measured as a ratio to the amount of light received at other specific wavelengths, and from that ratio, the amount of light received by the light source is determined. Since the means for determining the type does not use the absolute value of the amount of received light, the type of light source can be accurately determined even if the measurement time is short, and the device is simple.

[0025]

[Effects of the Invention] As is clear from the above embodiments, a means for measuring the amount of light received at a specific wavelength as a ratio to the amount of light received at other specific wavelengths, and determining the type of light source from that ratio. Since the absolute value of the amount of received light is not used, the type of light source can be accurately determined even if the measurement time is short. Also,
The components are a combination of 5 monochromatic receivers (or 4 monochromatic receivers combined with a photometric receiver), an A/D converter and an arithmetic unit, or a continuous receiver instead of a monochromatic receiver. The configuration is simple because it is a combination of an interference filter and a photodiode array.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a spectrometer for identifying fluorescent lamp types according to a first embodiment of the present invention.

[Figure 2] Graph showing an example of the spectral distribution of the fluorescent lamp to be measured

FIG. 3 is a block diagram showing the configuration of a spectrometer for identifying fluorescent lamp types according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing the configuration of a spectrometer for determining types of fluorescent lamps according to a third embodiment of the present invention.

[Explanation of symbols]

1 Monochromatic light receiver (monochromatic light receiving means) and reference receiver (
Reference light receiving means) 2 A/D converter (A/D conversion means) 3 Arithmetic device (arithmetic means) 4 Light source to be measured

Claims (4)

[Claims] Claim 1: Receives light from a light source to be measured, and includes a wavelength range of 410 to 430 nm and 445 to 475 nm among the received wavelength ranges.
monochromatic light receiving means that separately receives light of wavelengths of 480 to 500 nm and 630 to 670 nm and obtains outputs corresponding to respective amounts of received light; comprising a reference light receiving means for obtaining an output, an A/D converting means for converting into numerical values the outputs of the monochromatic light receiving means and the reference light receiving means, and an arithmetic means for performing calculations upon receiving the output of the A/D converting means, The calculation means calculates a ratio R1 between the amount of received light in each wavelength range and the reference amount of received light;
While calculating R2, R3, and R4, respectively,
The ratio R1 whose value is determined in advance for each type of light source
The spectrometer is configured to determine the type of the light source to be measured by comparing the light source with the light source to be measured.n, S2n, S3n, and S4n. Claim 2: Receives light from a light source to be measured, and includes a wavelength range of 410 to 430 nm and 445 to 475 nm among the received wavelength ranges.
monochromatic light receiving means that separates and receives light of 480 to 500 nm and 630 to 670 nm and outputs an output corresponding to each amount of received light; a photometric light receiving means that measures and outputs a relative value of the amount of received light; A/D conversion means for converting into numerical values each output of the A/D conversion means, and calculation means for performing calculations upon receiving the output of the A/D conversion means, and the calculation means calculates the amount of light received in each of the wavelength ranges and the photometric light receiving means. Ratio to output R1, R2, R3
, and R4, and their values are calculated using the ratios R1n, R2n, and R3 determined in advance for each type of light source.
A spectrometer that determines the type of light source to be measured by comparing the values of n and R4n. 3. The monochromatic light receiving means and the reference light receiving means are constituted by a photodiode array and a continuous interference filter disposed over the entire surface of the photodiode array, in which the wavelength of transmitted light changes continuously with respect to the incident position in the visible light band. spectrometer. 4. The monochromatic light receiving means comprises a photodiode array and a continuous interference filter disposed in front of the photodiode array, in which the wavelength of transmitted light changes continuously with respect to the incident position in the visible light band, and the photodiode is used as the photometric light receiving means. 3. The spectrometer according to claim 2, wherein the relative illuminance value is determined from the output of each element of the array using a standard luminous efficiency function.