JPH0915047A - Spectrum analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect energy within a measuring wavelength band uniformly through a simple structure and to analyze the spectrum of incident light accurately. SOLUTION: An incident light passes through a slit 12 in a light receiving unit 10 and impinges on a dispersion prism 13 and projected, while being dispersed, onto a line sensor 14. The line sensor 14 is driven with a drive pulse delivered from a drive circuit 21 and each pixel outputs a signal having a magnitude corresponding to the intensity of every wavelength, in time series. Output signal from the line sensor 14 is amplified through an amplifier 22 and converted through an A/D converter 23 into a digital data which is corrected at a spectroscopic characteristics correcting section 24 before being outputted to a display section 25. Optical intensity of incident light is displayed for every wavelength at the display section 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectrum analyzer for analyzing the spectrum of incident light.

[0002]

2. Description of the Related Art In a color CRT (cathode ray tube), white balance adjustment is performed to adjust the level of color signals so that white is reproduced faithfully. In order to perform this white balance adjustment, it is necessary to analyze the ratio of the color components of the light from the screen of the CRT when reproducing white. Conventionally,
A color CCD (charge coupled device) sensor was used for this analysis.

A color CCD sensor is disclosed in, for example, Japanese Unexamined Patent Publication No.
As disclosed in Japanese Patent Publication No. 205163, R (red), G
It has pixels for each color (green) and B (blue), and a filter for transmitting corresponding colored light is provided on the front surface of the pixel for each color. When this color CCD sensor is used, the ratio of the color components of the incident light can be known from the ratio of the pixel output for each color. This color CCD sensor is also used to identify the color of any object.

[0004]

However, in the above-described color CCD sensor, the relative spectral sensitivity characteristic (spectral sensitivity characteristic normalized by the peak value) of the pixel for each color of R, G, B is shown in FIG. As shown in a), each pixel can only detect the light intensity within each wavelength region of R, G, B having a predetermined width. Therefore, the color CCD sensor cannot detect the light intensity for each wavelength that is finely divided, and it is difficult to analyze the spectrum of the incident light.

Further, in the color CCD sensor, as shown in FIG.
As shown in (a), each pixel of R, G, B has sensitivity only in each wavelength region of R, G, B respectively.
Therefore, the composite spectral sensitivity characteristic is as shown in FIG. 7B, and it is impossible to detect all the energy in the visible light region uniformly. In addition, in the color CCD sensor, as shown in FIG.
As shown in (b), the composite spectral sensitivity characteristic does not become flat, but only the outputs in the R, G, and B wavelength regions having a predetermined width are obtained, so the composite spectral sensitivity characteristic becomes flat. Cannot be corrected.

Further, in the color CCD sensor, since the spectral sensitivity characteristics of the pixels for each color are overlapped with each other, a crosstalk component is generated. Therefore, a circuit for removing the crosstalk component is required, and the configuration becomes complicated.

Further, the color CCD sensor requires three amplifiers for amplifying the output for each color, which complicates the configuration and also causes a difference in the gain of each amplifier due to temperature drift or the like, for each color. The ratio of the output of changes, and causes a measurement error.

By the way, conventionally, a spectroscope as shown in FIG. 8 has been known. This spectroscope includes a collimator 101 that collimates incident light, a prism 102 that disperses the light emitted from the collimator 101 and emits the light in different directions depending on the wavelength, and light dispersed by the prism 102. That is, it has a telescope 103 for observing the spectrum. The collimator 101 has a slit 111 and a collimator lens 112 that makes the light that has passed through the slit 111 parallel light.

However, with such a conventional spectroscope, the spectrum of the incident light can be visually observed, but the light intensity for each wavelength cannot be quantitatively detected, and the spectrum of the incident light is analyzed. Is difficult to use. Further, as shown in FIG. 8, when the parallel light is generated by the slit 111 and the collimator lens 112, the amount of light passing through the slit 111 is small, so that there is a problem that the brightness of the spectrum becomes small. On the other hand, slit 1 is used to increase the brightness of the spectrum.
When the diameter of 11 is increased, the light emitted from the collimator lens 112 has a spread, and the accuracy of the spectroscope deteriorates. Further, in the conventional spectroscope, in order to change the measurement range, it is necessary to adjust the distance between the measurement target and the spectroscope, and there is a problem that the operation becomes complicated.

The present invention has been made in view of the above problems, and the first problem is that the energy in the measurement wavelength band can be detected uniformly with a simple structure and the spectrum of incident light can be accurately analyzed. It is to provide a spectrum analyzer that is capable of performing the above.

A second object of the present invention is, in addition to the above object, to provide a spectrum analyzer capable of increasing the amount of dispersed light.

A third object of the present invention is to provide a spectrum analyzer in which the measurement range can be easily changed in addition to the above-mentioned objects.

[0013]

According to a first aspect of the present invention, there is provided a spectrum analyzer which disperses incident light and emits the light in different directions according to wavelengths, and light having different wavelengths dispersed by the dispersive means. And a solid-state image pickup device for black and white for detecting the light intensity of each wavelength received by each pixel.

The spectrum analyzer according to claim 2 is
The spectrum analyzer according to claim 1 further comprises a correction means for correcting the spectral sensitivity characteristic of the monochrome solid-state imaging device.

The spectrum analyzer according to claim 3 is
The spectrum analyzer according to claim 1 further comprises a correction means for correcting the spectral characteristics of the emitted light of the dispersion means and the spectral sensitivity characteristics of the black and white solid-state imaging device.

The spectrum analyzer according to claim 4 is
Parallel light having a reticle and a first optical system for forming an image of an analysis target on the reticle and a second optical system for emitting light from the image formed on the reticle as substantially parallel light. A generating unit, a dispersing unit that disperses the light emitted from the parallel light generating unit and emits the light in different directions according to wavelengths, and a plurality of pixels that receive the light beams of different wavelengths dispersed by the dispersing unit. And a black and white solid-state image sensor for detecting the light intensity of each wavelength received by each pixel.

The spectrum analyzer according to claim 5 is
In the spectrum analyzer according to claim 4, the first optical system is a zoom lens system.

The spectrum analyzer according to claim 6 is
The spectrum analyzer according to claim 4, wherein an imaging lens system of a single-lens reflex camera is used as the first optical system, a focusing plate of a viewfinder of the single-lens reflex camera is used as the focusing plate, and a single-lens reflex camera is used as the second optical system. This is a viewfinder eyepiece system.

The spectrum analyzer according to claim 7 is
In the spectrum analyzer according to claim 6, the image forming lens system is a zoom lens system.

In the spectrum analyzer according to the first aspect of the present invention, the incident light is dispersed by the dispersion means and is emitted in different directions depending on the wavelength, and the light intensity for each wavelength is detected by the black and white solid-state image pickup device.

In the spectrum analyzer according to the second aspect, the spectral sensitivity characteristic of the monochrome solid-state image pickup device is corrected by the correction means.

In the spectrum analyzer according to the third aspect, the correction means corrects the spectral characteristic of the emitted light of the dispersion means and the spectral sensitivity characteristic of the black and white solid-state image pickup device.

In the spectrum analyzer according to the fourth aspect, an image to be analyzed is formed on the focusing screen by the parallel light generating means, and the light from this image is emitted as substantially parallel light to generate the parallel light. The light emitted from the means is dispersed by the dispersion means and emitted in different directions depending on the wavelength, and the light intensity for each wavelength is detected by the monochrome solid-state imaging device.

In the spectrum analyzer of the fifth aspect, since the first optical system is the zoom lens system, the range of the image formed on the focusing screen can be changed by the zoom lens system. The measurement range can be changed while keeping the positional relationship between the target and the spectrum analyzer constant.

In the spectrum analyzer according to the sixth aspect, since the image forming lens system and the finder of the single lens reflex camera are used as the parallel light generating means, it is possible to easily generate the parallel light by using the existing single lens reflex camera. Is possible.

In the spectrum analyzer according to the seventh aspect, since the image forming lens system of the single-lens reflex camera is a zoom lens system, the range of the image formed on the focusing screen can be changed by this zoom lens system. Therefore, the measurement range can be changed while keeping the positional relationship between the analysis target and the spectrum analyzer constant.

[0027]

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

FIG. 1 is an explanatory diagram showing the configuration of the spectrum analyzer according to the first embodiment of the present invention. This spectrum analyzer includes a light receiving unit 10.
The light receiving unit 10 includes a housing 11, a slit 12 provided at a front end portion of the housing 11, a dispersion prism 13 as a dispersion means arranged on an optical path of light passing through the slit 12 in the housing 11, A black-and-white CCD line sensor (hereinafter, simply referred to as a line sensor) 14 arranged at a position where the light emitted from the dispersion prism 13 is received in the housing 11.
The line sensor 14 is configured by using a CCD type solid-state image sensor and has a plurality of, for example, 5000 pixels arranged in a line. The dispersion prism 13 has a slit 12
The light that has passed through is dispersed and emitted in different vertical directions depending on the wavelength. The line sensor 14 is arranged such that the pixels are arranged vertically, and the light emitted from the dispersion prism 13 is projected onto the line sensor 14.
In general, the shorter the wavelength, the larger the refractive index. Therefore, on the line sensor 14, light of each wavelength from long-wavelength light (red light) to short-wavelength light (purple light) is continuous from the upper side. Line up. Each pixel of the line sensor 14 receives light of a different wavelength, and outputs a signal having a magnitude corresponding to the light intensity of each wavelength.

The spectrum analysis apparatus further includes a drive circuit 21 for applying a drive pulse to drive the line sensor 14.
And an amplifier 22 for amplifying the output signal of the line sensor 14.
And an A / D converter 23 for converting the output signal of the amplifier 22 from analog to digital (hereinafter referred to as A / D).
Then, with respect to the output data of the A / D converter 23, the spectral characteristic correction unit 24 that performs correction according to the spectral sensitivity characteristic of the line sensor 14 and the data corrected by the spectral characteristic correction unit 24 are input. And a display unit 25 for displaying the light intensity of each wavelength of the incident light. The spectral characteristic correction unit 24
For example, it is configured by a personal computer or a microcomputer.

Here, referring to FIG. 2, the spectral characteristic correction unit 2
The correction method in 4 will be described. As shown in FIG. 2 (a), the spectral characteristic correction unit 24 displays the light when the intensity is constant regardless of the wavelength in the visible light region, which is the measurement wavelength band of the spectrum analyzer. As shown in FIG. 2 (c), the spectral characteristics of the incident light obtained by the spectrum analyzer are also corrected so that the intensity becomes constant regardless of the wavelength. Therefore, when the line sensor 14 has a relative spectral sensitivity characteristic as indicated by reference numeral 31 in FIG. 2B, for example, the spectral characteristic correction unit 24 represents the inverse of the relative spectral sensitivity as a function of wavelength. It has a correction coefficient as indicated by 32. Then, the spectral characteristic correction unit 24 multiplies the data for each wavelength, which is output from the A / D converter 23 in time series, by a correction coefficient corresponding to each wavelength, and outputs the result. As a result, the spectral characteristic corrected by the spectral characteristic correction unit 24 has a constant intensity regardless of the wavelength as shown in FIG.

When the dispersion prism 13 has a spectral characteristic in which the intensity of the output light is not constant regardless of the wavelength when the light of which the intensity is constant regardless of the wavelength is incident, the spectral characteristic correction unit 24 At the dispersion prism 13
The correction may be made by including the spectral characteristic of the outgoing light and the spectral sensitivity characteristic of the line sensor 14. In this case,
If a light having a constant intensity regardless of the wavelength is incident on the spectrum analyzer, the correction coefficient is determined so that the spectral characteristic after the correction by the spectral characteristic correction unit 24 becomes constant regardless of the wavelength. good.

Next, the operation of the spectrum analyzer according to this embodiment will be described. In FIG. 1, the color CRT 2 is used by the spectrum analyzer according to the present embodiment.
The spectrum of the light from the screen of 6 is analyzed, and the color C
An example of performing white balance adjustment of the RT 26 is shown. The light from the screen of the color CRT 26 passes through the slit 12 of the light receiving unit 10, enters the dispersion prism 13, is dispersed by the dispersion prism 13 and is emitted, and is projected onto the line sensor 14. Line sensor 1
4 is driven by a drive pulse from the drive circuit 21, and outputs a signal having a magnitude corresponding to the light intensity of each wavelength received by each pixel in time series. The output signal of the line sensor 14 is amplified by the amplifier 22, converted into digital data by the A / D converter 23, and input to the spectral characteristic correction unit 24.

Here, for example, when light having a spectral characteristic as shown in FIG. 3A enters a spectrum analyzer, the spectral sensitivity characteristic of the line sensor 14 causes the spectral characteristic of the output signal of the line sensor 14. For example in Figure 3
The result is as shown in FIG. The spectral characteristic correction unit 24 is shown in FIG.
As shown in (c), the correction coefficient 32, which is the reciprocal of the relative spectral sensitivity characteristic 31 of the line sensor 14, is set to the A / D converter 23.
Correction is performed by multiplying the output data of. As a result, the spectral characteristic corrected by the spectral characteristic correction unit 24 becomes substantially the same as the spectral characteristic of the incident light shown in FIG. 3A, as shown in FIG. 3D.

The output data of the spectral characteristic correction unit 24 is input to the display unit 25, and the display unit 25 displays the light intensity for each wavelength of the incident light. That is, the spectrum of the incident light is analyzed. Then, based on this analysis result, for example, white balance adjustment of the color CRT 26 is performed. The display method on the display unit 25 is as shown in FIG.
The method of displaying by the graph as shown in (d) may be used, or the method of displaying the light intensity of an arbitrary wavelength as a numerical value may be used.

As described above, according to the spectrum analyzer of the present embodiment, a circuit for removing the crosstalk component is provided as in the case of using the conventional color CCD sensor, or an amplifier is provided for each color. There is no need, and the spectrum of the incident light can be accurately analyzed with a simple configuration using the dispersion prism 13 and the black and white line sensor 14.

Further, according to the spectrum analyzer of the present embodiment, the spectral sensitivity characteristic of the line sensor 14 and the spectral characteristic of the outgoing light of the dispersion prism 13 can be corrected.
It enables more accurate spectrum analysis. FIG.
As shown in (c), the total energy within the measurement wavelength band can be detected evenly.

FIG. 4 is a sectional view showing a light receiving unit in a spectrum analyzer according to the second embodiment of the present invention. In the spectrum analyzer according to the present embodiment, the light receiving unit 40 shown in FIG. 4 is provided instead of the light receiving unit 10 in the first embodiment. The light receiving unit 40 is provided with a condenser lens group 43 including a convex lens 41 and a concave lens 42 on the front side of the slit 14. The condenser lens group 43 converts the light flux converged by the convex lens 41 into a parallel light flux by the concave lens 42 and makes it enter the slit 12.

With such a configuration, the spectrum analyzer according to the present embodiment is suitable for analyzing the spectrum within a somewhat large measurement area because the measurement area is expanded as compared with the first embodiment. Becomes Other configurations, operations and effects are similar to those of the first embodiment.

FIG. 5 is a sectional view showing a light receiving unit in a spectrum analyzer according to a third embodiment of the present invention. In the spectrum analyzer according to the present embodiment, the light receiving unit 50 shown in FIG. 5 is provided instead of the light receiving unit 10 in the first embodiment. The light receiving unit 50 includes a housing 51, a slit 52 provided at a front end portion of the housing 51, and a reflection type diffraction grating as a dispersion means arranged on an optical path of light passing through the slit 52 in the housing 51. 53 and the line sensor 1 disposed in the housing 51 at a position for receiving the emitted light (diffracted light) of the reflection type diffraction grating 53.
4 is provided. The reflective diffraction grating 53 disperses the incident light and emits it in different vertical directions depending on the wavelength. The line sensor 14 is arranged such that the pixels are arranged in the vertical direction, and the light emitted from the reflection type diffraction grating 53 is projected onto the line sensor 14.

In the spectrum analyzer according to the present embodiment, the incident light is dispersed by the reflection type diffraction grating 53,
Similar to the first embodiment, the line sensor 14 detects the light intensity for each wavelength. Other configurations, operations and effects are similar to those of the first embodiment.

FIG. 6 is a sectional view showing the structure of the spectrum analyzer according to the fourth embodiment of the present invention. The spectrum analyzer according to the present embodiment emits light from the first optical system that forms an image of the reticle and the analysis target on the reticle and the image formed on the reticle as substantially parallel light. The parallel light generation unit 60 having the second optical system and the spectrum measurement unit 70 connected to the parallel light generation unit 60.

In the present embodiment, an image forming lens system of a single-lens reflex camera and a finder optical system are used as the parallel light generating section 60. The parallel light generator 60 has a camera body 61 having an opening at the front end and an eyepiece 62 at the rear end.
And a zoom lens unit 63 connected to the front of the opening at the front end of the camera body 61. The zoom lens unit 63 includes a zoom lens system 64 as an imaging lens system including a plurality of lens groups, and the zoom lens system 64.
And a zoom lens system drive unit 65 for holding each of the lens groups constituting the above and performing zooming by changing the positional relationship of each lens group. In the camera body 61, as a finder optical system, a movable mirror 66 arranged between the zoom lens system 64 and a film surface (not shown) at an inclination of 45 ° with respect to the optical axis of the zoom lens system 64,
A focusing plate (focus glass) 67 arranged on the optical path of the light passing through the zoom lens system 64 and reflected by the movable mirror 66, a pentaprism 68 arranged above the focusing plate 67, and an eyepiece section 62. And an eyepiece lens system 69 housed inside.

The spectrum measuring unit 70 includes a housing 71 having a connecting portion 72 detachably connectable to the eyepiece portion 62 of the parallel light generating portion 60. In the housing 71, the dispersion prism 13 arranged on the optical path of the light emitted from the eyepiece 62, the line sensor 14 arranged in front of the light emitted from the dispersion prism 13, and the dispersion prism 13 And a collimator lens 73 for condensing light of each wavelength emitted from each of them on different pixels of the line sensor 14, respectively.

First, the operation of the viewfinder optical system of the single-lens reflex camera used as the parallel light generator 60 will be described. In viewfinder optical system of single-lens reflex camera,
The light that has passed through the zoom lens system 64 is reflected upward by the movable mirror 66, and an image of the subject is formed on the focusing screen 67 by the zoom lens system 64.
A normal image is formed through the eyepiece lens system 69. By the way, since the distance between the eye and the eyepiece lens system 69 changes depending on whether or not a person who views the subject image through the eyepiece unit 62 uses glasses, in such a case, in the viewfinder optical system of the single-lens reflex camera, However, it is designed so that the image magnification does not change. Specifically, the focusing screen 6
The light from the image formed on the image plane 7 is collimated by the eyepiece lens system 69 and emitted. In this embodiment,
By utilizing the characteristics of the finder optical system of such a single-lens reflex camera, parallel light to be incident on the dispersion prism 13 is generated.

Next, the operation of the spectrum analyzer according to this embodiment will be described. An image to be analyzed such as a screen of a color CRT is formed on the focusing screen 67 by the zoom lens system 64, and the light from the image formed on the focusing screen 67 is collimated by the eyepiece lens system 69 to be in contact with it. It is emitted from the eye portion 62. The light emitted from the eyepiece 62 is dispersed by the dispersion prism 13 in the spectrum measurement unit 70. The dispersed light of each wavelength becomes parallel light and is emitted in a different direction for each wavelength. The light of each wavelength is condensed by the collimator lens 73 on different pixels of the line sensor 14. That is, the spectrum to be analyzed is projected on the line sensor 14. Therefore, similarly to the first embodiment, the spectrum of the analysis target can be analyzed by using the output signal of the line sensor 14. Further, when the zoom lens system drive unit 65 changes the positional relationship between the lens groups that form the zoom lens system 64 to perform zooming, the range of the image formed on the focusing screen 67 changes, so the analysis target The measurement range at can be changed.

As described above, according to the spectrum analyzer of the present embodiment, the parallel light is generated by using the zoom lens system 64 and the finder optical system of the single-lens reflex camera without using the slit. The amount of light incident on the dispersion prism 13 can be increased as compared with the case where parallel light is generated using a slit, and as a result, the brightness of the spectrum is increased and the analysis accuracy can be improved. Further, by performing zooming with the zoom lens system 64, it is possible to easily change the measurement range while keeping the positional relationship between the analysis target and the spectrum analyzer constant.

In the present embodiment, the parallel light generating section 6
Although the zoom lens system 64 and the finder optical system of the single-lens reflex camera are used as 0, an optical system having the same operation as these may be separately configured to serve as the parallel light generation unit.
Further, as the dispersion means, a reflection type diffraction grating may be used as in the third embodiment. Other configurations, operations, and effects are similar to those of the first embodiment.

The present invention is not limited to the above embodiments, and for example, a transmission type diffraction grating is provided as a dispersion means,
The line sensor 14 may be arranged at a position where the light emitted from the transmission type diffraction grating is received. Further, a MOS type may be used as the solid-state image sensor.

Also in the second to fourth embodiments, the dispersion prism 13 is used in the spectral characteristic correction unit 24.
Alternatively, the spectral characteristics of the emitted light of the reflection type diffraction grating 53 and the spectral sensitivity characteristics of the line sensor 14 may be corrected.

Further, the spectrum analyzer of the present invention is
Color C for white balance adjustment of color CRT
It can be used not only when analyzing the spectrum of light from the RT screen, but also when analyzing the spectrum of an arbitrary object.

[0051]

As described above, according to the spectrum analyzer of the first aspect, the black-and-white solid which receives the emitted light by dispersing the incident light by the dispersing means and emitting it in different directions depending on the wavelength. Since the light intensity for each wavelength is detected by the image sensor, the effect that the total energy within the measurement wavelength band can be detected uniformly with a simple configuration and the spectrum of the incident light can be accurately analyzed is provided. is there.

According to the spectrum analyzer of the second aspect, the spectral sensitivity characteristic of the black and white solid-state image pickup device is corrected, and according to the spectrum analyzer of the third aspect, the dispersion means is provided. Since the spectral characteristics of the incident light and the spectral sensitivity characteristics of the black and white solid-state image sensor are corrected, there is an effect that more accurate spectrum analysis can be performed in addition to the effect of the spectrum analyzer according to claim 1. .

According to the spectrum analyzer of the fourth aspect, the first image is formed on the reticle and the image of the object to be analyzed.
The parallel light generating means having the second optical system that emits the light from the image formed on the focusing plate as substantially parallel light is generated by the parallel light generating means. Therefore, in addition to the effect of the spectrum analyzer according to the first aspect, there is an effect that the amount of dispersed light can be increased.

According to the spectrum analyzer of the fifth aspect, since the first optical system is the zoom lens system, in addition to the effect of the spectrum analyzer of the fourth aspect, the zoom lens system allows the zoom lens system to move the focus lens on the focusing screen. There is an effect that the range of the image formed can be changed and the measurement range can be easily changed while keeping the positional relationship between the analysis target and the spectrum analyzer constant.

According to the spectrum analyzer of the sixth aspect, since the image forming lens system and the finder of the single-lens reflex camera are used as the collimated light generating means, in addition to the effect of the spectrum analyzer of the fourth aspect, the existing one is used. There is an effect that parallel light can be easily generated using a single-lens reflex camera.

According to the spectrum analyzer of the seventh aspect, since the image forming lens system is the zoom lens system, in addition to the effect of the spectrum analyzer of the sixth aspect, the zoom lens system is used to form the image on the focusing screen. There is an effect that the range of the image to be imaged can be changed, and the measurement range can be easily changed while keeping the positional relationship between the analysis target and the spectrum analyzer constant.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a spectrum analyzer according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram for explaining a correction method in a spectral characteristic correction unit in FIG.

FIG. 3 is a characteristic diagram for explaining the operation of the spectrum analyzer according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a light receiving unit in the spectrum analyzer according to the second embodiment of the present invention.

FIG. 5 is a cross-sectional view of a light receiving unit in a spectrum analyzer according to a third embodiment of the present invention.

FIG. 6 is a cross-sectional view showing the configuration of a spectrum analyzer according to a fourth embodiment of the present invention.

FIG. 7 is a characteristic diagram showing a relative spectral sensitivity characteristic and a composite spectral sensitivity characteristic for each color of a conventional color CCD sensor.

FIG. 8 is a cross-sectional view showing a configuration of a conventional spectroscope.

[Explanation of symbols]

 10 Light-receiving unit 12 Slit 13 Dispersion prism 14 Monochrome CCD line sensor 24 Spectral characteristic correction unit 25 Display unit

Claims (7)

[Claims] 1. A dispersion means for dispersing incident light and emitting the light in different directions according to wavelengths, and a plurality of pixels for receiving light of different wavelengths dispersed by the dispersion means, each pixel receiving light. And a solid-state image pickup device for black and white for detecting the light intensity for each wavelength. 2. The spectrum analyzer according to claim 1, further comprising a correction unit that corrects a spectral sensitivity characteristic of the monochrome solid-state image pickup device. 3. The spectrum analyzer according to claim 1, further comprising a correction unit that corrects the spectral characteristic of the emitted light of the dispersion unit and the spectral sensitivity characteristic of the monochrome solid-state image sensor. 4. A first optical system for forming an image of a focusing plate and an analysis target on the focusing plate and a second optical system for emitting light from the image formed on the focusing plate as substantially parallel light. A parallel light generating means having an optical system, a dispersing means for dispersing the light emitted from the parallel light generating means and emitting the light in different directions depending on the wavelength, and light of different wavelengths dispersed by the dispersing means. A spectrum analyzer having a plurality of pixels for receiving light, and a black and white solid-state image sensor for detecting the light intensity for each wavelength received by each pixel. 5. The spectrum analyzer according to claim 4, wherein the first optical system is a zoom lens system. 6. An imaging lens system of a single-lens reflex camera is used as the first optical system, a focusing plate of a viewfinder of the single-lens reflex camera is used as the focusing plate, and a viewfinder of a single-lens reflex camera is used as the second optical system. 5. The spectrum analyzer according to claim 4, wherein the eyepiece lens system is used. 7. The spectrum analyzer according to claim 6, wherein the imaging lens system is a zoom lens system.