EP0639267A1 - Lamp for transmitting ultraviolet light - Google Patents

Lamp for transmitting ultraviolet light

Info

Publication number
EP0639267A1
EP0639267A1 EP93910511A EP93910511A EP0639267A1 EP 0639267 A1 EP0639267 A1 EP 0639267A1 EP 93910511 A EP93910511 A EP 93910511A EP 93910511 A EP93910511 A EP 93910511A EP 0639267 A1 EP0639267 A1 EP 0639267A1
Authority
EP
European Patent Office
Prior art keywords
lamp
ultraviolet light
light
light source
discharge tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93910511A
Other languages
German (de)
French (fr)
Inventor
Lars A. Bergkvist
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UV TECH i UMEA AB
Original Assignee
UV TECH i UMEA AB
Labino Patent AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UV TECH i UMEA AB, Labino Patent AB filed Critical UV TECH i UMEA AB
Publication of EP0639267A1 publication Critical patent/EP0639267A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/38—Investigating fluid-tightness of structures by using light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/06—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for filtering out ultraviolet radiation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details

Definitions

  • the present invention relates to an ultraviolet lamp.
  • the invention relates to a lamp of the kind used to detect oil leakages in jet engines, among other things.
  • Oil will fluoresce when illuminated with ultraviolet 10 light and such lighting is therefore used to detect oil leakages in jet engines, among other things, oil leakages from other sources are also traced with the aid of ultraviolet lighting.
  • Ultraviolet light is also used in other determining contexts, for instance to determined between different types of rock.
  • a known oil leakage detecting lamp includes a parabol- 20 ic reflector and a conventional gas discharge tube or bulb, which has an electrode distance of 30 to 70 mm. The use of such a tube renders the lamp very large and awkward.
  • the present invention solves these problems and pro ⁇ vides a lamp which is compact, easy to operate and effective.
  • the present invention thus relates to a lamp which emits ultraviolet light and is intended for illuminat ⁇ ing objects for inspection purposes, such as for detecting oil leakages in jet engines, said lamp including a reflector, a light source which emits ultraviolet light, and a filter for filtering-out light within the visible spectrum, said lamp being characterized in that the light source is comprised of a gas discharge tube having an electrode distance of less than 5 mm.
  • Figure 1 illustrates a lamp for emitting ultraviolet light and intended for irradiating objects for inspec- tion purposes, such as to detect oil leakages in jet engines.
  • the lamp includes a reflector 1, a light source 2 for emitting ultraviolet light, and a filter 3 for filtering-out light within the visible spectrum.
  • the filter 3 is suitably comprised of so-called Wood's glass.
  • the filter may be included in a lamp-covering glass, or may alternatively be placed in some other location in the beam path, for instance around the light source.
  • the light source 2 is com ⁇ prised of a gas discharge tube which has an electrode distance of less than 5 mm.
  • the reflector may, for ins ⁇ tance, have an aperture diameter of 135 mm, although said diameter may, of course, be both larger and smaller.
  • the reflector is suitably a parabolic round reflector.
  • This tube is a mercury discharge tube of the gas discharge 5 type having an electrode distance of 4.2 mm.
  • % discharge tube has a wattage of 35 W.
  • inventive lamp provides completely different possibilities of detecting oil leakages to those afforded by the known lamp, particu ⁇ larly when the space available is limited.
  • the lamp is supplied with a high frequency voltage from a power means 4.
  • the power means is intended to deliver in a discharge tube ignition phase a high frequency voltage 25 at high voltage, preferably exceeding 10 kHz at a voltage higher than 10 kV.
  • the power means may be of any known kind and may, for instance, deliver 15 kV at 11.5 kHz during the igni-
  • the power means 4 is integrated with the lamp.
  • the lamp it is also possible for the lamp to include a battery 5, so that the lamp can be run on battery power.
  • the battery will preferably be a compact lead accumulator or an Ni/Cd-battery.
  • the present invention may be varied as regards the aforesaid voltages and frequencies and structural configuration of the lamp.

Abstract

A lamp for emitting ultraviolet light and illuminating objects for inspection purposes, such as detecting oil leakages in jet engines. The lamp comprises a reflector (1), a light source (2) for emitting ultraviolet light, and a filter (3) for filtering-out light within the visible spectrum. The invention is characterized in that the light source (2) is comprised of a gas discharge tube having an electrode distance of less than 5 mm.

Description

Lamp for Transmitting Ultraviolet Light
The present invention relates to an ultraviolet lamp.
•I 5 More specifically, the invention relates to a lamp of the kind used to detect oil leakages in jet engines, among other things.
Oil will fluoresce when illuminated with ultraviolet 10 light and such lighting is therefore used to detect oil leakages in jet engines, among other things, oil leakages from other sources are also traced with the aid of ultraviolet lighting.
15 Ultraviolet light is also used in other determining contexts, for instance to determined between different types of rock.
A known oil leakage detecting lamp includes a parabol- 20 ic reflector and a conventional gas discharge tube or bulb, which has an electrode distance of 30 to 70 mm. The use of such a tube renders the lamp very large and awkward.
25 One problem with the known lamp is that focusing of the light becomes poor because of the large electrode distance. In turn, this means that the wattage of the tube must be as high as 110 W. Despite this high wattage, it is necessary to hold the lamp close to the 30 object concerned, as close as 30 cm or even closer, in order to enable oil leakages in jet engines to be "* detected, for instance. This makes it very difficult
> to handle the lamp, particularly when the inspection i or control needs to be carri.ed out i.n confi.ned spaces.
35
The present invention solves these problems and pro¬ vides a lamp which is compact, easy to operate and effective. The present invention thus relates to a lamp which emits ultraviolet light and is intended for illuminat¬ ing objects for inspection purposes, such as for detecting oil leakages in jet engines, said lamp including a reflector, a light source which emits ultraviolet light, and a filter for filtering-out light within the visible spectrum, said lamp being characterized in that the light source is comprised of a gas discharge tube having an electrode distance of less than 5 mm.
The invention will now be described in more detail with reference to an exemplifying embodiment thereof and also with reference to the accompanying drawing, the Figure 1 of which is a schematic longitudinal section view of an inventive lamp.
Figure 1 illustrates a lamp for emitting ultraviolet light and intended for irradiating objects for inspec- tion purposes, such as to detect oil leakages in jet engines. The lamp includes a reflector 1, a light source 2 for emitting ultraviolet light, and a filter 3 for filtering-out light within the visible spectrum. The filter 3 is suitably comprised of so-called Wood's glass. The filter may be included in a lamp-covering glass, or may alternatively be placed in some other location in the beam path, for instance around the light source.
According to the invention, the light source 2 is com¬ prised of a gas discharge tube which has an electrode distance of less than 5 mm. This enables the reflector to focus the light generated by the light source to an area corresponding to the light aperture of the re- fleeter, for instance. The reflector may, for ins¬ tance, have an aperture diameter of 135 mm, although said diameter may, of course, be both larger and smaller. The reflector is suitably a parabolic round reflector. A light source developed by Philips under the designa¬ tion 35 DI UV -constitutes one example of a light source that can be used with the inventive lamp. This tube is a mercury discharge tube of the gas discharge 5 type having an electrode distance of 4.2 mm. The
% discharge tube has a wattage of 35 W.
Surprisingly, it has been found that when using the inventive lamp fitted with the aforesaid discharge 10 tube, it is possible to detect oil leakage at a dis¬ tance as far away as roughly 25 metres, when irradiat¬ ing the object concerned, which shall be compared with the known lamp which must be held as close as 30 centimetres to the object to be inspected.
15
It is quite evident that the inventive lamp provides completely different possibilities of detecting oil leakages to those afforded by the known lamp, particu¬ larly when the space available is limited.
20
According to one preferred embodiment, the lamp is supplied with a high frequency voltage from a power means 4. The power means is intended to deliver in a discharge tube ignition phase a high frequency voltage 25 at high voltage, preferably exceeding 10 kHz at a voltage higher than 10 kV.
The power means may be of any known kind and may, for instance, deliver 15 kV at 11.5 kHz during the igni-
30 tion phase. The discharge tube will then ignite imme¬ diately. The known lamp is connected directly to the
^ mains supply through the agency of a reactor, although without the provision of the aforesaid power means, resulting in an ignition time of about 5 minutes.
35 While the lamp is in operation, the power means can supply the discharge tube with 85 V at 11.5 kHz, i.e. with a much lower voltage. Reference numeral 7 identifies the lamp housing, while reference numeral 8 identifies a cable for connecting the lamp to the mains supply network.
According to one preferred embodiment of the inven¬ tion, the power means 4 is integrated with the lamp. ' It is also possible for the lamp to include a battery 5, so that the lamp can be run on battery power. In this case, the battery will preferably be a compact lead accumulator or an Ni/Cd-battery.
The use of a battery powered lamp provides a complete¬ ly different degree of flexibility in investigatory work than when the lamp must be connected to a mains supply source and provided with the cables to this end.
The present invention may be varied as regards the aforesaid voltages and frequencies and structural configuration of the lamp.
The present invention is not therefore considered to be restricted to the aforedescribed embodiments, since variations can be made within the scope of the following Claims.

Claims

Claims
1. A lamp for emitting ultraviolet light and irradi¬ ating objects for inspection purposes, such as for
5 detecting oil leakages in jet engines, said lamp comprising a reflector (1), a light source (2) for emitting ultraviolet light, and a filter (3) for filtering-out light within the visible spectrum, c h a r a c t e r i z e d in that the light source 10 (2) is comprised of a gas discharge tube having an electrode distance of less than 5 mm.
2. A lamp according to Claim 1, c h a r a c ¬ t e r i z e d by a power means (4) which functions to
15 supply the lamp with high frequency voltage and which is intended to deliver in a discharge tube ignition phase a high frequency voltage at high voltage, pref¬ erably exceeding 10 kHz at a voltage higher than 10 kV.
20
3. A lamp according to Claim 2, c h a r a c ¬ t e r i z e d in that the power means (4) is integral with the lamp; and in that the lamp includes a facili¬ ty for including a battery (5) so as to enable the
25 lamp to be operated on battery power.
-
/
EP93910511A 1992-05-08 1993-05-07 Lamp for transmitting ultraviolet light Withdrawn EP0639267A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9201461A SE9201461L (en) 1992-05-08 1992-05-08 Luminaire for emitting ultraviolet light
SE9201461 1992-05-08
PCT/SE1993/000403 WO1993023730A1 (en) 1992-05-08 1993-05-07 Lamp for transmitting ultraviolet light

Publications (1)

Publication Number Publication Date
EP0639267A1 true EP0639267A1 (en) 1995-02-22

Family

ID=20386192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93910511A Withdrawn EP0639267A1 (en) 1992-05-08 1993-05-07 Lamp for transmitting ultraviolet light

Country Status (3)

Country Link
EP (1) EP0639267A1 (en)
SE (1) SE9201461L (en)
WO (1) WO1993023730A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5959306A (en) * 1996-02-08 1999-09-28 Bright Solutions, Inc. Portable light source and system for use in leak detection
DE19608042A1 (en) * 1996-03-02 1997-09-04 Imab Stiftung Simple UV filter lamp
AU2003262498B9 (en) * 1997-04-03 2005-09-08 Bright Solutions, Inc. Light Source for Use In Leak Detection in Heating, Ventilating, and Air Conditioning Systems
US9093258B2 (en) 2011-06-08 2015-07-28 Xenex Disinfection Services, Llc Ultraviolet discharge lamp apparatuses having optical filters which attenuate visible light
US9165756B2 (en) 2011-06-08 2015-10-20 Xenex Disinfection Services, Llc Ultraviolet discharge lamp apparatuses with one or more reflectors
US9867894B2 (en) 2015-07-02 2018-01-16 Xenex Disinfection Services, Llc. Germicidal apparatuses with configurations to selectively conduct different disinfection modes interior and exterior to the apparatus
US9517284B1 (en) 2015-07-02 2016-12-13 Xenex Disinfection Services, Llc. Germicidal apparatuses with configurations to selectively conduct different disinfection modes interior and exterior to the apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136890A (en) * 1961-07-12 1964-06-09 Harry C Wain Broad spectrum prospector
US3495118A (en) * 1968-03-04 1970-02-10 Varian Associates Electrode supports for arc lamps
US4229658A (en) * 1978-08-18 1980-10-21 Dentsply Research & Development Corp. Xenon light apparatus for supplying ultraviolet and visible spectra
US4386292A (en) * 1980-07-02 1983-05-31 Gte Products Corporation Projection lamp comprising single ended arc discharge lamp and an interference filter
US4800282A (en) * 1985-02-07 1989-01-24 Sharp Kabushiki Kaisha Apparatus and method for detecting residual organic compounds
US4897551A (en) * 1988-04-11 1990-01-30 Spectral Sciences, Inc. Leak detector

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9323730A1 *

Also Published As

Publication number Publication date
SE9201461D0 (en) 1992-05-08
SE9201461L (en) 1993-11-09
WO1993023730A1 (en) 1993-11-25

Similar Documents

Publication Publication Date Title
US5674000A (en) Light source for use in leak detection in heating, ventilating, and air conditioning systems that utilize environmentally-safe materials
US5526237A (en) Lighting system for increasing brightness to a light guide
US6177678B1 (en) Method and apparatus for leak detection and non-destructive testing
US5742066A (en) Light source for use in leak detection in heating, ventilating, and air conditioning systems that utilize environmentally-safe materials
GB2206707A (en) Light collecting device for flow cytometry
KR960034846A (en) Reflective Hybrid Lamp Assembly
EP0639267A1 (en) Lamp for transmitting ultraviolet light
US5256852A (en) Process and device for laser working with remote control
ES2162634T3 (en) ELECTRICAL REFLECTING LAMP.
DE59904233D1 (en) LIGHTING EQUIPMENT
EP0210626A3 (en) Metallic halide electric discharge lamps
SE8307157D0 (en) PROJECTOR FOR THE MANUFACTURE OF A PLOT OF LIGHTED LIGHT, SPECIFICALLY FOR BIOSTIMULATION
CA2200364C (en) Light source for use in leak detection in heating, ventilating, and air conditioning systems that utilize environmentally-safe materials
CA2243579A1 (en) Improvement in videoprojection lamps
NZ209186A (en) Smoke detector with reflector for flashlamp
ES2087897T3 (en) GASEOUS DISCHARGE LAMP.
US6274970B1 (en) Arc lamp
EP0860655A3 (en) Lamp reflector for use with gaseous discharge lighting
SE9202494D0 (en) DEVICE FOR EMISSION OF LIGHT OR LASER LIGHT
US1781064A (en) Adjustable lamp socket
RU2070057C1 (en) Device for pulse sterilization of medical instruments
SE0201121L (en) Globe-type electro-light fixture
AU723572B2 (en) Light source for use in leak detection in heating, ventilating and air conditioning systems
SU1073822A2 (en) Gaseous discharge lamp
JPH08148285A (en) Discharge lamp lighting apparatus

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19941110

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: UV TECH I UMEA AB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19961202