JPH046422A - Ultraviolet sensor for bactericidal lamp - Google Patents

Abstract

PURPOSE:To make it possible to improve measuring accuracy by providing a layer containing phosphor which receives bactericidal ultraviolet rays and emits excited ultraviolet rays whose wavelength is within a specified rage, providing a visible light cutting film, and detecting the emitted excited ultraviolet rays. CONSTITUTION:A layer 1 contains a phosphor A which receives bactericidal ultraviolet rays and emits excited ultraviolet rays whose wavelength is within the range of 300 - 400 nm. The layer 1, a visible-light cutting filter 2 and an ultraviolet-ray detector 3 are overlapped. The light from a bactericidal lamp is inputted into an ultraviolet sensor 10 for the bactericidal lamp. The bactericidal ultraviolet rays in the light, especially the ultraviolet rays whose wavelength is 254 nm, are received with the phosphor A. The phosphoor A emits the excited ultraviolet rays mainly in the range of 300 - 400 nm. In the light emitted from the layer 1 containing the phosphor A, the visible light is cut with the filter 2. Thereafter, the light is inputted into the detector 3. In this way, the detector 3 excludes the effect of the visible light and accurately measures only the excited ultraviolet rays, i.e. the bactericidal ultraviolet rays.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an ultraviolet sensor for germicidal lamps.

[Conventional technology]

Attaching ultraviolet light sensors (or ultraviolet monitors) for germicidal lamps to equipment that uses germicidal lamps is being considered. It is desirable that such an ultraviolet sensor for germicidal lamps be unaffected by visible light emitted from germicidal lamps and external light.

Examples of conventional ultraviolet sensors for germicidal lamps include those that convert ultraviolet rays into visible light using a phosphor and measure the illuminance of the visible light.

[Problem to be solved by the invention]

The conventional ultraviolet sensor for germicidal lamps described above has the drawback of poor accuracy due to the influence of visible light.

Therefore, an object of the present invention is to provide an ultraviolet sensor for germicidal lamps that is not affected by visible light emitted from germicidal lamps or external light.

[Means to solve the problem]

In order to solve the above problems, an ultraviolet sensor for germicidal lamps according to the present invention has a wavelength of 300 to 4
Phosphor A that emits excitation ultraviolet light within the range of 00nn+
and a visible light cut filter to detect the excitation ultraviolet rays.

In order to solve the above problems, the ultraviolet sensor for germicidal lamps according to the present invention further provides a UV sensor for germicidal lamps that receives germicidal ultraviolet light and has a wavelength of 3.
a layer containing a phosphor A that emits excitation ultraviolet light in the range of 00 to 400 na+, a visible light cant filter, and a layer containing a phosphor B that emits an excitation visible light upon receiving the excitation ultraviolet light; It is designed to detect visible light.

[For production]

The phosphor A converts germicidal ultraviolet light into excitation ultraviolet light with a wavelength of 300 to 4°, and the visible light filter blocks visible light emitted from germicidal lamps and other light sources. This makes it possible to measure excitation ultraviolet light even in a relatively bright place that is not affected by visible light. Since the excitation ultraviolet rays are generated by the germicidal ultraviolet rays, the sterilizing ultraviolet rays can be measured with high accuracy by measuring the excitation ultraviolet rays.

If excitation ultraviolet rays are converted into excitation visible light by phosphor B,
It can be read with a visible light detector such as a luminance needle. That is, it is not easily affected by visible light even in a relatively bright place, and germicidal ultraviolet rays can be measured by measuring excited visible light with a visible light detector. Since the excitation visible light is also derived from germicidal ultraviolet light, by measuring the excitation visible light, germicidal ultraviolet light can be measured with high accuracy.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings showing embodiments thereof.

FIG. 1 schematically represents one embodiment of the ultraviolet sensor for germicidal lamps according to the invention. As shown in FIG. 1, this ultraviolet sensor 1 for germicidal lamps consists of a layer 1 containing a phosphor A that emits excitation ultraviolet light with a wavelength of 300 to 400 nm by germicidal ultraviolet light (e.g., wavelength 254 nm), and a visible light cuff). Filter 2 and ultraviolet detector (UV detector) 3
are superimposed in this order.

When exposed to germicidal ultraviolet light, phosphor A has a luminescence of 300 to 400
It is not limited to those having an emission spectrum only in r+a+,
For example, excitation light of less than 300 nm may be emitted;
It is desirable that the emission spectrum is large in the range of 00 to 400 nm. As the phosphor A, for example, 5rBa Ot F
:Eu” (Commercially available products include rNP-802J blank light manufactured by Hinami Kagaku Kogyo ■),
Ca x (P 04) z: T 1 [Health lamp (
For example, there are fluorescent lamps for health lines), etc. Fluorescent material A may also emit excitation light upon receiving light other than 254 nm ultraviolet light, but if the energy of the excitation light due to 254 nm is different from that of other light (for example, 312 ns, 365 nm, etc.)
It is preferable that the excitation light is much larger than that of the excitation light.

The layer l containing the phosphor A can be formed by using the phosphor A and other materials as necessary. For example, the phosphor A can be mixed with KBr and press solidified, or the phosphor A can be formed by mixing the phosphor A with an ultraviolet transmitting material. It is formed by adding it to a liquid and forming a coating film, but the method of forming it is not particularly limited.

The visible light cut filter is designed to cut off ultraviolet rays (for example, wavelength 30
There is no particular limitation as long as it transmits ultraviolet rays with a wavelength of 0 to 400 nm and does not transmit visible light (for example, visible light with a wavelength of 400 to 700 nm). For example, glass doped with NiO [for example, easily available glass] Examples include glass for black lights (ultraviolet transmitting/visible light absorbing glass, etc.), but are not particularly limited.

The ultraviolet detector is not particularly limited as long as it can detect ultraviolet rays of 300 to 400 ni, and examples include an ultraviolet intensity meter and a silicon photodiode. Also, 3
As long as it can detect ultraviolet light of 00 to 400 nm, it may also detect visible light. This is because visible light is canted through a visible light cut filter.
This is because only ultraviolet rays of 300 to 400 nm are detected.

As shown in FIG. 1, when light from a germicidal lamp is made incident on the germicidal lamp ultraviolet sensor 10 as shown by the arrow, the phosphor A receives the germicidal ultraviolet light in the light, particularly the ultraviolet light with a wavelength of 254 nm. It emits excitation ultraviolet light mainly within the range of 300 to 400 nm. The light exiting the layer 1 containing the phosphor A is passed through the visible light cant filter 2 to filter visible light (for example, wavelengths 400 to 70
0 nm light) is cut off and enters the ultraviolet detector 3. This makes it possible to eliminate the influence of visible light (emitted from germicidal lamps and external light) and accurately measure only the excitation ultraviolet light, that is, the germicidal ultraviolet light.

FIG. 2 schematically represents one embodiment of the ultraviolet sensor for germicidal lamps according to the invention set forth in claim 2. As shown in FIG. 2, this ultraviolet light sensor +20 for germicidal lamps includes a layer 1 containing the phosphor A, a visible light cut filter 2, and a wavelength of 300 to 400 nm.
A layer 4 containing a phosphor B that emits excited visible light by the excited ultraviolet rays of 00nn+ and a visible light detector 5 are stacked in this order.

Fluorescent material B is a fluorescent material for ultraviolet-visible light conversion, and 3
It is preferable to use one that is easily excited by ultraviolet light of 00 to 400 nm and has a large emission spectrum in the visible range, but there is no particular limitation. As the phosphor B, for example, YgOs:Eu
Examples of commercially available phosphors include rEU-107j manufactured by Mitsui Toatsu Dyes Co., Ltd.), but there are no particular limitations.

Layer 4 containing phosphor B is formed using phosphor B and other materials as necessary, for example, in the same manner as layer 1 containing phosphor A, but there are no particular limitations on the method of formation. Not done.

As shown in FIG. 2, when light from a germicidal lamp is incident on the germicidal lamp ultraviolet sensor 20 as shown by the arrow, the germicidal ultraviolet rays in the light, especially the ultraviolet rays with a wavelength of 254 nm, mainly cause the phosphor A to It emits excitation ultraviolet light in the range of 300 to 400 nm. The visible light of the light exiting the layer 1 containing the phosphor A is cut off by a visible light cut filter 2, and enters the layer 4 containing the phosphor B. The phosphor B receives the excitation ultraviolet light and emits excitation visible light, which is incident on the visible light detector 5. This makes it possible to accurately measure the illuminance of excited visible light, that is, germicidal ultraviolet light, by eliminating the influence of visible light (emitted from germicidal lamps and external light).

The visible light detector is not particularly limited as long as it can detect visible light, and includes, for example, a visible light illuminometer, a silicon photodiode, and the like.

If the ultraviolet ray sensor for germicidal lamps according to the present invention is used, there are two methods: a method of directly detecting sterilizing ultraviolet rays using a photomultiplier tube, and a method of directly detecting sterilizing ultraviolet rays by cutting only visible light with a quartz glass interference filter. sensors (one that detects both ultraviolet and visible light, and one that detects only visible light)
Compared to methods that detect only ultraviolet rays, it is possible to measure germicidal ultraviolet rays at a lower cost.

Note that the ultraviolet sensor for germicidal lamps according to the present invention is not limited to that shown in the drawings above. For example, the order of superposition is
The order is not limited to that shown in the figures, and the order may be changed as appropriate if the purpose of the present invention can be achieved.

Specific examples and comparative examples of the present invention are shown below, but the present invention is not limited to the following examples.

Example 1 - 95 parts by weight of KBr powder (average particle size 1.cm) was added with a phosphor (
"rNP-802" manufactured by Nichia Chemical Industries, Ltd., powder) was added in an amount of 5M, and press molding (pressure 400 kgf/
c! ! , 10 minutes) and a layer containing phosphor A (φ20m,
Thickness 1. OD) was prepared.

Light from a germicidal lamp (wavelength 254n) is applied to the layer containing this phosphor A.
m), it emits excitation light with a wavelength of 370 nm.

The layer containing this phosphor A is coated with black light glass (φ2
0 Tsuru, thickness Imm) and combination (they are just placed one on top of the other, not glued together, but they may be integrated by gluing if necessary. The same applies to other cases), UV intensity meter [manufactured by Dobcon Co., Ltd.] Product name UVR-365, detector...
Silicon diode, for UV365 (sensitivity peak 365
nm)) to obtain an ultraviolet sensor for germicidal lamps having the configuration shown in FIG.

The black light glass used here has a wavelength of 3.
Transmittance of light from 00 to 400 nm is 90%, wavelength 400 to 400 nm
The transmittance beyond 700nw+ was 0%.

Comparative Example 1 In Example 1, a commercially available transparent glass (with a transmittance of 90% for light in the wavelength range of 300 to 400 nm and a transmittance of 90% for light in the wavelength range of 400 to 700 nm) was used instead of the black light glass. The same procedure as in Example 1 was carried out except that the following was used.

~Example 2 - One side (sterilizing ultraviolet irradiation side) of the blank light glass used in Example 1 (used as a visible light cut filter) was coated with UV-transparent paint (product name "Itotsubu" manufactured by Asahi Glass Co., Ltd., fluorine). A paint made by adding 10 parts by weight of the above-mentioned NP-802 to 90 parts (solid content of 5% by weight of the resin) is applied, and on the other side, 90 parts by weight of the above-mentioned cytotube is coated with a phosphor [Mitsui Toatsu Dyes]. Product name rEU- manufactured by Co., Ltd.
107'', powder (3 to 5.w)) 103i is applied and cured (curing conditions: dry at room temperature), and phosphor A is applied to one side of blank light glass. A layer containing phosphor B (about 100 nm thick) was formed on the other side, and a layer containing phosphor B (about 100 nm thick) was formed on the other side. The filter made in this way is used as an illuminance needle (product name rM-3 manufactured by Dobcon Co., Ltd., light receiver: silicon diode).
An ultraviolet sensor for germicidal lamps having the configuration shown in FIG. 2 was obtained.

Note that when the layer containing phosphor A used in Example 2 is irradiated with light from a germicidal lamp (including a wavelength of 254 nm), it emits excitation light with a wavelength of 370 nm.

The layer containing phosphor B is exposed to germicidal lamp light (wavelength 254 nm).
m) is incident after passing through the layer containing the phosphor A and the black light glass, the wavelength is 620 nm.
emits m excitation light.

- Comparative Example 2 - Example 2 was carried out in exactly the same manner as in Example 2, except that the transparent glass used in Comparative Example 1 was used instead of the blank light glass.

Using the UV sensors for germicidal lamps obtained in Examples 1 and 2 and Comparative Examples 1 and 2, germicidal ultraviolet light (wavelength 254 nm) was measured, and the results are shown in Table 1.

For measurement, a germicidal lamp (20W) and a general fluorescent lamp (20W) were used.
One sensor was used, and these two sensors were installed at the same location so that they could be turned on at two times of weight or one at a time, and each sensor was installed at a location 1-1 apart. Under condition ■, only the germicidal lamp was turned on, under condition ■ both the germicidal lamp and the fluorescent lamp were turned on, and under condition ■ only the fluorescent lamp was turned on.

Table 1 As shown in Table 1, the ultraviolet ray sensors for germicidal lamps of the examples are much less affected by external light than the corresponding comparative examples.

〔Effect of the invention〕

Since the ultraviolet ray sensors for germicidal lamps according to the inventions according to claims 1 and 2 are as described above, they can accurately measure sterilizing ultraviolet rays without being affected by external light.

Furthermore, according to the second aspect of the invention, since sterilizing ultraviolet rays can be measured by measuring the illuminance of visible light, it is possible to reduce the cost without using expensive instruments such as interference filters and photomultiplier tubes.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing one embodiment of the ultraviolet sensor for germicidal lamps according to the invention as claimed in claim 1, and FIG. 2 is the ultraviolet sensor for germicidal lamps as claimed in the invention as claimed in claim 2. FIG. 2 is a schematic cross-sectional view showing one embodiment of the invention. ■... Layer containing phosphor A 2... Visible light power 7 filter 3... Ultraviolet detector 4... Layer containing phosphor B 5... Visible light detector 10.20.・・Representative of ultraviolet ray sensor for germicidal lamps Patent attorney Takehiko Matsumoto

Claims (1)

[Scope of Claims] 1. A layer including a phosphor A that emits excitation ultraviolet light having a wavelength in the range of 300 to 400 nm upon receiving germicidal ultraviolet light, and a visible light cut filter, so as to detect the excitation ultraviolet light. UV sensor for germicidal lamps. 2. A layer containing a phosphor A that emits excitation ultraviolet light having a wavelength in the range of 300 to 400 nm upon receiving germicidal ultraviolet light, a visible light cut filter, and a phosphor B that emits excitation visible light upon receiving the excitation ultraviolet light. An ultraviolet sensor for a germicidal lamp, comprising a layer containing: and detecting the excited visible light.