WO2008122935A1 - Remote measuring and display - Google Patents

Remote measuring and display Download PDF

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Publication number
WO2008122935A1
WO2008122935A1 PCT/IB2008/051247 IB2008051247W WO2008122935A1 WO 2008122935 A1 WO2008122935 A1 WO 2008122935A1 IB 2008051247 W IB2008051247 W IB 2008051247W WO 2008122935 A1 WO2008122935 A1 WO 2008122935A1
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WO
WIPO (PCT)
Prior art keywords
visible light
property
measurement
measuring
illuminating
Prior art date
Application number
PCT/IB2008/051247
Other languages
French (fr)
Inventor
Richard J. Caldwell
Adrian W. Payne
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2008122935A1 publication Critical patent/WO2008122935A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G01K1/04—Scales
    • G01K1/06—Arrangements for facilitating reading, e.g. illumination, magnifying glass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/026—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring distance between sensor and object
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D7/00—Indicating measured values
    • G01D7/005—Indication of measured value by colour change
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/025—Interfacing a pyrometer to an external device or network; User interface
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/0896—Optical arrangements using a light source, e.g. for illuminating a surface
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/645—Specially adapted constructive features of fluorimeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N2021/1793—Remote sensing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/645—Specially adapted constructive features of fluorimeters
    • G01N21/6456—Spatial resolved fluorescence measurements; Imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/42—Simultaneous measurement of distance and other co-ordinates

Definitions

  • the present invention relates to an apparatus and a method for remote measuring.
  • Remote measuring devices are well known. Examples are infra-red thermometers and laser scanners.
  • An infra-red thermometer or temperature sensor reads the infra-red emissions from the surface of an object and in this way provides a means to measure temperature at a distance without contact.
  • a laser scanner emits pulses of light to an object and measures the reflectivity of an object and distance to the object by detecting the intensity and the time-of- flight of the reflected pulses of light.
  • UV reflectivity /absorption spectra UV reflectivity /absorption spectra.
  • a color contour of an object is displayed from information that is obtained using an array of thermopile sensors.
  • a color contour of an object is generated by pre-establishing a relationship between IR radiation power and color, measuring the power of incident IR radiation emanating from different locations on the object, mapping the measured IR radiation powers to colors, and generating color contour information that can be displayed on a color display.
  • the color contour information represents the temperature of an object at different locations.
  • the measurement values are shown on its display. It is an object of the invention to improve the display of measurement information by remote measurement devices.
  • an apparatus comprising means for remotely measuring a property of an object, means for translating a measured value of the property to visible light and means for illuminating the object or an area near the object with the visible light.
  • the visible light projected on or near the object represents the measurement value.
  • the invention allows the operator of the remote measuring apparatus or any other person viewing the object being measured to easily judge the value of the measurement without looking at the apparatus itself.
  • US 2005/0064354 Al discloses a heat warning device for warning that a surface of for example a stove is hot. It comprises heat sensors adjacent to potentially hot surfaces and connected to a controller for ascertaining a surface temperature and communicating the surface temperature to the controller.
  • a fiber optic cable having a plurality of fibers surrounded by a protective sheathing runs from an electric light source controlled by the controller.
  • the plurality of fibers transmits light to illuminate predetermined warning symbols near the surfaces.
  • the illuminated heat warning symbols are visible to an observer who sees that the surfaces are dangerously hot. Whenever a specified surface temperature is reached, the corresponding symbol is lit and remains lit.
  • the heat sensors need to be pre-installed adjacent to the surface of which the temperature needs to be measured.
  • the optical fibers need to be pre-installed. In the apparatus according to the invention such pre-installed technology is avoided.
  • the means for translating are adapted for mapping the measured value to a parameter of the visible light according to a pre-established relationship. This allows the operator or any other observer to determine the measured value based on a parameter of the visible light.
  • the parameter of the visible light may be the presence of the visible light. For example, light may be emitted when the measured value is over a certain threshold value and not emitted if the measured value is below this threshold value.
  • This embodiment may be implemented in a very simple way.
  • the parameter of the visible light is the flashing of the visible light. Flashing light is a powerful tool for drawing the attention of an observer and therefore is a very suitable way of displaying measurement values, in particular if these measurement values are in a range that is considered as dangerous.
  • the parameter of the visible light is the brightness or intensity of the visible light or the color of the visible light.
  • the mapping of the measurements values to the visible light may be done in an intuitive way.
  • the visible light comprises text.
  • the text can be a number representing the value of a measurement such as "80" or a word describing the value of a measurement such as "hot”.
  • the visible light may also comprise an image.
  • a well chosen image may be very intuitive to show a measurement value. For example, a warning triangle could be displayed on a hot object.
  • the means for measuring are adapted to sweep the measurement surface in at least one direction and preferably two directions. In this way, the property of the object can be measured over a large area.
  • the apparatus comprises a plurality of remote measuring arrangements for measuring the property of the object at a plurality of surfaces.
  • the means for translating are adapted for translating the measured values of the property at each of the plurality of surfaces to respective visible light.
  • the apparatus comprises a plurality of illuminating arrangements adapted for illuminating the surfaces or areas near the surfaces with the respective visible light.
  • the apparatus may be a portable device that can be taken by an operator to any place where measurements need to be taken.
  • the apparatus is integrated into a lighting system, such as a room lighting system or a street lighting system.
  • a lighting system such as a room lighting system or a street lighting system.
  • the means for illuminating the object or a surface near the object with the visible light may be one or more existing lights of the lighting system.
  • a method comprising the steps of: remotely measuring a property of an object; translating a measured value of the property to visible light; and illuminating the object or an area near the object with the visible light.
  • Fig. 1 shows a block diagram of a first embodiment of the remote measuring apparatus according to the present invention.
  • Fig. 2 shows a block diagram of a second embodiment of the remote measuring apparatus according to the present invention.
  • Fig. 3 schematically shows an exemplary application of the remote measuring apparatus according to the present invention.
  • the remote measuring apparatus 10 remotely measures a property of an object 20. Thereto it comprises a remote measuring arrangement 30.
  • suitable remote measuring arrangements 30 may be chosen.
  • an infra-red temperature sensor may be used.
  • Such an infra-red temperature sensor reads the infra-red emissions from the surface of an object, and in this way provides a means to measure temperature at a distance without contact, requiring no excitation of the object.
  • a laser scanner could be used.
  • a laser scanner emits pulses of light to an object and measures the reflectivity of an object and distance to the object by detecting the intensity and the time-of- flight of the reflected pulses of light.
  • remote measuring arrangement 30 based on UV or X-ray Fluorescence Technology could be used.
  • a remote measuring arrangement 30 detects and categorizes photons resulting from excitation of a target area by an energy source and thereby identifies the presence of the substances of interest.
  • Such devices reference is made to http://www.engadget.conn/2006/07/25/handheld-nneth-gun-for-drug-detection/ and http://www.cdex-inc.com/pr/63006.html, describing a device developed by CDEX Inc.
  • remote measuring arrangements 30 may be readily selected by the skilled person depending on the property that should be measured. It is noted that remote measuring devices are generally known and commercially available, so it is not needed to describe such devices in more detail.
  • the remote measuring arrangement 30 remotely measures a value of a property of the object 20, i.e. without contact. This is achieved by directing the measuring means to a target surface 25 for measurement.
  • the size of the area 25 for measurement depends on the distance of the apparatus 10 to the object 20 and the angle ⁇ of the field of view 35 of the remote measuring arrangement 30.
  • the field of view 35 is the area from which the remote measuring arrangement 30 may take measurements.
  • the remote measuring arrangement 30 is connected to processing means 40 by means of a bidirectional control link.
  • Processing means 40 comprise a microprocessor and an associated memory and are loaded with an appropriate computer program.
  • the remote measuring apparatus 10 may be provided with user input means 45, preferably keys, for enabling the user to control the apparatus 10.
  • the user may be enabled to start and stop measurements, to adjust the settings of the remote measuring arrangement 30, such as the view angle ⁇ thereof, etc.
  • the processing means 40 transmit the corresponding control signals to the remote measuring arrangement 30.
  • the processing means 40 furthermore receive the measured value of the property of the object from the remote measuring arrangement 30.
  • the processing means provide a control signal to illuminating arrangement 50.
  • the illuminating arrangement 50 emits a projection 55 of visible light. In this way the measured value is translated into visible light.
  • the illuminating arrangement 50 may be a single light source, such as an LED or incandescent bulb, or may be a group of light sources, such as a group of LEDs each with different colors.
  • the illuminating arrangement 50 may have a large grid of light sources, such as provided by a video projector. This would enable the visible light projection to produce any projection form and to change rapidly.
  • the illuminating arrangement 50 may also include lenses and movable parts to focus the beam.
  • the illuminating arrangement 50 could also be based on a laser and use movable mirrors to move the beam direction.
  • the visible light is projected on the measurement surface 25.
  • the bundle of visible light may be projected on a surface that is slightly larger or smaller than the surface of measurement 25 or on a surface that is close to the measurement surface 25.
  • the operator of the remote measuring apparatus 10 or any other person looking at the object 20 may easily judge the value of the measurement by looking at the visible light projected on the object. This visible light represents the measurement value obtained by the remote measuring arrangement 30. There is no need to look at the apparatus 10, itself.
  • the remote measuring apparatus 10 may be a portable device. However, it may also be integrated into a pre-existing lighting system such as a room lighting system or a street lighting system. In that case the illuminating arrangement 50 may be one of the lights of the lighting system.
  • the illuminating arrangement 50 may adapt a parameter of the visible light.
  • processing means 40 may switch the illuminating arrangement on and off by means of the control signal. For example, in case of a remote temperature measurement, the illuminating arrangement 50 is only switched on if the measured temperature value reaches a threshold value. If the temperature value is under the threshold value, the light emitting means 50 are switched off.
  • the processing means 40 may control the illuminating arrangement 50 in such a way that in case that the measurement values of the property are considered to be normal, the light emitted is steady (i.e. non- flashing) and if the measurement values are outside the normal range, the light starts flashing.
  • the parameter of the visible light may be the brightness or intensity of the visible light. For example, the intensity of the visible light may be increased, when the measured value increased (e.g. a higher temperature).
  • the parameter of the visible light may also be the color thereof. This color may be varied as a function of the measured value.
  • a plurality of ranges of measured values may each be mapped or translated to a different color.
  • An intuitive color scale could be used. For example: in case of temperature measurements the coldest range could be mapped to a deep blue color, the next to coldest range to a lighter blue color, etc. and the hottest temperature range could be mapped to a bright red color.
  • the processing means 40 may comprise a table wherein the mappings of value ranges of measurement values and the corresponding control signals for adjust the color of the emitted light are stored.
  • the visible light comprises images or text. For example, a
  • warning triangle could be displayed on a hot object, the temperature in degrees Celsius could be displayed or a word indicative of the state of the object such as "hot” could be displayed.
  • the user may be enabled to set the parameter of the visible light or the images or text contained therein by means of the input means 45.
  • the processing means 40 instruct the illuminating arrangement 50 to emit light as long as the remote measuring arrangement 30 is executing measurements.
  • the processing means 40 instruct the illuminating arrangement 50 to emit light as long as the remote measuring arrangement 30 is executing measurements.
  • light is emitted only, in case that the measurement values are reliable and to switch the illuminating arrangement off when this is not the case.
  • the illuminating arrangement 50 may be switched off. In this way it is avoided that the operator is confused by light emitted based on useless measurements.
  • the power consumption is reduced, which is an issue if the power supply is based on batteries.
  • the remote measuring apparatus 10 may be adapted to sweep the remote measuring arrangement 30 and the illuminating arrangement 50, synchronously in the x and y direction in order to get a larger area of coverage.
  • the apparatus 10 may comprise a plurality of remote measurement arrangements and a plurality of illuminating arrangements arranged in an array. This also results in a large coverage area.
  • Fig. 2 shows a one-dimensional array but of course the array may also be two-dimensional.
  • the remote measuring apparatus 10 comprises a plurality of remote measuring arrangements 32, 34, 36 each having a respective field of view 320, 340, 360 enabling the measuring of a respective surface 22, 24, 26.
  • the remote measurement arrangements 32, 34, 26 each have corresponding illuminating arrangements 52, 54, 56 emitting projections 520, 540, 560 of visible light, which are projected on the respective measurement surfaces or points 22, 24, 26.
  • the processing means 40 receive the measurements values from all measuring arrangements and control the light emitted by the corresponding illuminating arrangements by means of appropriate control signals.
  • the remote measurement arrangements 32, 34, 36 and the corresponding illuminating arrangements 52, 54, 56 are intermingled. However, it is also possible to place the remote measurement arrangements 32, 34, 36 together and the illuminating arrangements 52, 54, 56 together.
  • the measuring surfaces 22, 24, 26 are adjacent to one another or they are slightly overlapping, in order to obtain a good measurement coverage.
  • it may be necessary that the angle of view of the remote measurement sensors 32, 34, 36 is adapted as a function of the distance to the object 10. This could be done manually by the user but preferably the apparatus 10 is enabled to adapt these angles of view, automatically.
  • the apparatus 10 according to Fig. 2 is able to project a light pattern on the object 20 representing measurement values at different measurement surfaces.
  • the translation from the measured value into the visible light is executed by processing means loaded with a suitable computer program.
  • this translation may also be performed by suitable hardware components.
  • the apparatus could be installed into a building and connected to the internal lighting structure and so allow the building lights to automatically light up to warn of dangerously hot areas, such as a hob and/or cold parts of the room. This could be done in an intuitive way by lighting up hot parts red and cold parts blue.
  • This concept could be generalized to measuring other properties than temperature: the room lighting could be used to light up places where liquid has been spilled, where there are drug takers, where a gas leak has been detected, etc.
  • a 'thermal image' could be projected onto an object.
  • This could be a visible light projection that maps the thermal gradient of the object into a visible color spectrum.
  • a fireman could see the hottest part of a wall or building or an engineer could see the hottest part of a circuit.
  • a combination of remote absorption measurement for detecting the presence of water and a remote temperature measurement for measuring the temperature thereof could be used in for example a street light to highlight ice on the road/pavement.
  • the presence of ice could be signaled by lighting up the cats-eyes in the road to give early warning for oncoming drivers.
  • a similar application would be an indoor wet/slippery floor warning by lighting up the water.
  • the apparatus according to the present invention may also be used in the medical field for remotely sensing some body parameter.
  • An example thereof is a thermometer that remotely reads the temperature of the skin and projects the reading back on that particular part of the skin.
  • the apparatus according to the present invention can also be used for law- enforcement purposes, for example for drug inspections.
  • the apparatus is pointed at will at persons and visible light is projected only on those persons in the possession of drugs. Alternatively, the color of the light may be changed depending on the measurement result. In this way, the law enforcement officer even in crowded areas can easily see which persons are in the possession of drugs and which persons are not.
  • the measuring apparatus can be a laser distance measuring device that can measure the distance to an object.
  • the visible light projection could then display the distance to points on the object as numbers. But perhaps more useful would be to highlight the flatness of an object, wall or surface, using either the color or intensity of the visible light or a contour map display to represent on the surface its distance from the user.
  • Fig. 3 where the flatness of surface 28 is measured.
  • the distances as indicated by lines w, x, y and z are all measured and can be mathematically be shown to be on a flat surface.
  • the distance indicated by line a however is too short to be on the flat surface, so this part 29 of the surface 28 is determined not to be flat. It may be illuminated in red and the rest of the surface 28 in green.
  • Software processing can be used to cancel out the random changes in distance from the user caused by the user's random movements.

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  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Human Computer Interaction (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

An apparatus (10) and a method are described for remotely measuring a property of an object (20). A measured value of the property is translated to visible light. The object (20) or an area near the object is illuminated with the visible light. The visible light projected on or near the object (20) represents the measurement value. The operator of the remote measuring apparatus (10) or any other person viewing the object (20) being measured can easily judge the value of the measurement without looking at the apparatus (10) itself.

Description

Remote measuring and display
BACKGROUND OF THE INVENTION
Technical field
The present invention relates to an apparatus and a method for remote measuring.
DESCRIPTION OF RELATED ART
Remote measuring devices are well known. Examples are infra-red thermometers and laser scanners. An infra-red thermometer or temperature sensor reads the infra-red emissions from the surface of an object and in this way provides a means to measure temperature at a distance without contact. A laser scanner emits pulses of light to an object and measures the reflectivity of an object and distance to the object by detecting the intensity and the time-of- flight of the reflected pulses of light.
Recently, further devices have appeared on the market, which use the reflectivity or absorption spectrum of an object to measure its properties. These devices excite the object with some form of laser and then measure the emission spectrum characteristics. For example, devices are known that detect particular drugs by analysis of
UV reflectivity /absorption spectra.
All these measuring devices will emit a sound or present a figure on their display to alert the user as to the strength of the reading . A further example of a remote measuring device is disclosed in US
2006/0062275 Al. In this device a color contour of an object is displayed from information that is obtained using an array of thermopile sensors. A color contour of an object is generated by pre-establishing a relationship between IR radiation power and color, measuring the power of incident IR radiation emanating from different locations on the object, mapping the measured IR radiation powers to colors, and generating color contour information that can be displayed on a color display. The color contour information represents the temperature of an object at different locations. Also in this prior art device the measurement values are shown on its display. It is an object of the invention to improve the display of measurement information by remote measurement devices.
SUMMARY OF THE INVENTION This and other objects of the invention are achieved by an apparatus according to claim 1 and a method according to claim 13. Favorable embodiments are defined by the dependent claims 2-12.
According to an aspect of the invention an apparatus is provided comprising means for remotely measuring a property of an object, means for translating a measured value of the property to visible light and means for illuminating the object or an area near the object with the visible light. The visible light projected on or near the object represents the measurement value. The invention allows the operator of the remote measuring apparatus or any other person viewing the object being measured to easily judge the value of the measurement without looking at the apparatus itself. US 2005/0064354 Al discloses a heat warning device for warning that a surface of for example a stove is hot. It comprises heat sensors adjacent to potentially hot surfaces and connected to a controller for ascertaining a surface temperature and communicating the surface temperature to the controller. A fiber optic cable having a plurality of fibers surrounded by a protective sheathing runs from an electric light source controlled by the controller. The plurality of fibers transmits light to illuminate predetermined warning symbols near the surfaces. The illuminated heat warning symbols are visible to an observer who sees that the surfaces are dangerously hot. Whenever a specified surface temperature is reached, the corresponding symbol is lit and remains lit. In this known heat warning device the heat sensors need to be pre-installed adjacent to the surface of which the temperature needs to be measured. Also the optical fibers need to be pre-installed. In the apparatus according to the invention such pre-installed technology is avoided.
According to an embodiment the means for translating are adapted for mapping the measured value to a parameter of the visible light according to a pre-established relationship. This allows the operator or any other observer to determine the measured value based on a parameter of the visible light.
The parameter of the visible light may be the presence of the visible light. For example, light may be emitted when the measured value is over a certain threshold value and not emitted if the measured value is below this threshold value. This embodiment may be implemented in a very simple way. Alternatively, the parameter of the visible light is the flashing of the visible light. Flashing light is a powerful tool for drawing the attention of an observer and therefore is a very suitable way of displaying measurement values, in particular if these measurement values are in a range that is considered as dangerous. According to a further alternative embodiment the parameter of the visible light is the brightness or intensity of the visible light or the color of the visible light. Hereby, the mapping of the measurements values to the visible light may be done in an intuitive way. For example, high measurement values may be shown as bright light or red light, while low measurement values may be shown as weak light or green light. According to a still further embodiment the visible light comprises text. For example, the text can be a number representing the value of a measurement such as "80" or a word describing the value of a measurement such as "hot".
The visible light may also comprise an image. A well chosen image may be very intuitive to show a measurement value. For example, a warning triangle could be displayed on a hot object.
According to a favorable embodiment the means for measuring are adapted to sweep the measurement surface in at least one direction and preferably two directions. In this way, the property of the object can be measured over a large area.
According to a further favorable embodiment the apparatus comprises a plurality of remote measuring arrangements for measuring the property of the object at a plurality of surfaces. The means for translating are adapted for translating the measured values of the property at each of the plurality of surfaces to respective visible light. The apparatus comprises a plurality of illuminating arrangements adapted for illuminating the surfaces or areas near the surfaces with the respective visible light. In this way, the property of the object can be measured over a large area and the visible light representing the measurement values can be projected on this large area.
The apparatus may be a portable device that can be taken by an operator to any place where measurements need to be taken.
Alternatively, the apparatus is integrated into a lighting system, such as a room lighting system or a street lighting system. In this case the means for illuminating the object or a surface near the object with the visible light may be one or more existing lights of the lighting system.
According to a further aspect of the invention a method is provided comprising the steps of: remotely measuring a property of an object; translating a measured value of the property to visible light; and illuminating the object or an area near the object with the visible light. These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and its numerous objects and advantages will become more apparent to those skilled in the art by reference to the following drawings, in conjunction with the accompanying specification, in which:
Fig. 1 shows a block diagram of a first embodiment of the remote measuring apparatus according to the present invention.
Fig. 2 shows a block diagram of a second embodiment of the remote measuring apparatus according to the present invention. Fig. 3 schematically shows an exemplary application of the remote measuring apparatus according to the present invention.
Throughout the figures like reference numerals refer to like elements.
DETAILED DESCRIPTION OF THE PRESENT INVENTION Referring now to Fig. 1, a block diagram of a first embodiment of the remote measuring apparatus 10 according to the invention will be described. The remote measuring apparatus 10 remotely measures a property of an object 20. Thereto it comprises a remote measuring arrangement 30.
Depending on the property of the object that should be measured, suitable remote measuring arrangements 30 may be chosen. For example, in the case that the temperature of the object should be measured, an infra-red temperature sensor may be used. Such an infra-red temperature sensor reads the infra-red emissions from the surface of an object, and in this way provides a means to measure temperature at a distance without contact, requiring no excitation of the object. In case that the distance to an object and the reflectivity thereof should be measured a laser scanner could be used. A laser scanner emits pulses of light to an object and measures the reflectivity of an object and distance to the object by detecting the intensity and the time-of- flight of the reflected pulses of light. In case that the remote measuring apparatus 10 is to be used to identify or validate the presence of substances of interest (e.g., drugs, distilled spirits, explosives, chemical agents) on or in an object, remote measuring arrangement 30 based on UV or X-ray Fluorescence Technology could be used. Such a remote measuring arrangement 30 detects and categorizes photons resulting from excitation of a target area by an energy source and thereby identifies the presence of the substances of interest. For an example of such devices reference is made to http://www.engadget.conn/2006/07/25/handheld-nneth-gun-for-drug-detection/ and http://www.cdex-inc.com/pr/63006.html, describing a device developed by CDEX Inc.
Of course other known remote measuring arrangements 30 may be readily selected by the skilled person depending on the property that should be measured. It is noted that remote measuring devices are generally known and commercially available, so it is not needed to describe such devices in more detail.
The remote measuring arrangement 30 remotely measures a value of a property of the object 20, i.e. without contact. This is achieved by directing the measuring means to a target surface 25 for measurement. The size of the area 25 for measurement depends on the distance of the apparatus 10 to the object 20 and the angle φ of the field of view 35 of the remote measuring arrangement 30. The field of view 35 is the area from which the remote measuring arrangement 30 may take measurements. The remote measuring arrangement 30 is connected to processing means 40 by means of a bidirectional control link. Processing means 40 comprise a microprocessor and an associated memory and are loaded with an appropriate computer program. The remote measuring apparatus 10 may be provided with user input means 45, preferably keys, for enabling the user to control the apparatus 10. For example the user may be enabled to start and stop measurements, to adjust the settings of the remote measuring arrangement 30, such as the view angle φ thereof, etc. The processing means 40 transmit the corresponding control signals to the remote measuring arrangement 30. The processing means 40 furthermore receive the measured value of the property of the object from the remote measuring arrangement 30. Depending on this measured value the processing means provide a control signal to illuminating arrangement 50. Based on this control signal the illuminating arrangement 50 emits a projection 55 of visible light. In this way the measured value is translated into visible light. The illuminating arrangement 50 may be a single light source, such as an LED or incandescent bulb, or may be a group of light sources, such as a group of LEDs each with different colors. The illuminating arrangement 50 may have a large grid of light sources, such as provided by a video projector. This would enable the visible light projection to produce any projection form and to change rapidly. The illuminating arrangement 50 may also include lenses and movable parts to focus the beam. The illuminating arrangement 50 could also be based on a laser and use movable mirrors to move the beam direction. The visible light is projected on the measurement surface 25. Alternatively, the bundle of visible light may be projected on a surface that is slightly larger or smaller than the surface of measurement 25 or on a surface that is close to the measurement surface 25.
The operator of the remote measuring apparatus 10 or any other person looking at the object 20 may easily judge the value of the measurement by looking at the visible light projected on the object. This visible light represents the measurement value obtained by the remote measuring arrangement 30. There is no need to look at the apparatus 10, itself.
The remote measuring apparatus 10 may be a portable device. However, it may also be integrated into a pre-existing lighting system such as a room lighting system or a street lighting system. In that case the illuminating arrangement 50 may be one of the lights of the lighting system.
Based on the control signal received from the processing means 40, the illuminating arrangement 50 may adapt a parameter of the visible light. In the simplest form processing means 40 may switch the illuminating arrangement on and off by means of the control signal. For example, in case of a remote temperature measurement, the illuminating arrangement 50 is only switched on if the measured temperature value reaches a threshold value. If the temperature value is under the threshold value, the light emitting means 50 are switched off.
Many other parameters of the visible light may be used for indicating measurement values to the operator. A first one of them is the flashing of the visible light. For example, the processing means 40 may control the illuminating arrangement 50 in such a way that in case that the measurement values of the property are considered to be normal, the light emitted is steady (i.e. non- flashing) and if the measurement values are outside the normal range, the light starts flashing. Furthermore, the parameter of the visible light may be the brightness or intensity of the visible light. For example, the intensity of the visible light may be increased, when the measured value increased (e.g. a higher temperature). The parameter of the visible light may also be the color thereof. This color may be varied as a function of the measured value. For example, a plurality of ranges of measured values may each be mapped or translated to a different color. An intuitive color scale could be used. For example: in case of temperature measurements the coldest range could be mapped to a deep blue color, the next to coldest range to a lighter blue color, etc. and the hottest temperature range could be mapped to a bright red color. The processing means 40 may comprise a table wherein the mappings of value ranges of measurement values and the corresponding control signals for adjust the color of the emitted light are stored. Alternatively, the visible light comprises images or text. For example, a
(flashing) warning triangle could be displayed on a hot object, the temperature in degrees Celsius could be displayed or a word indicative of the state of the object such as "hot" could be displayed.
The user may be enabled to set the parameter of the visible light or the images or text contained therein by means of the input means 45.
Preferably, the processing means 40 instruct the illuminating arrangement 50 to emit light as long as the remote measuring arrangement 30 is executing measurements. However, it is also possible that light is emitted only, in case that the measurement values are reliable and to switch the illuminating arrangement off when this is not the case. For example, if the apparatus is pointed by accident to a very remote object that is too far a way for a reliable measurement to be executed, the illuminating arrangement 50 may be switched off. In this way it is avoided that the operator is confused by light emitted based on useless measurements. Furthermore, in this case the power consumption is reduced, which is an issue if the power supply is based on batteries. The remote measuring apparatus 10 may be adapted to sweep the remote measuring arrangement 30 and the illuminating arrangement 50, synchronously in the x and y direction in order to get a larger area of coverage.
Alternatively, the apparatus 10 may comprise a plurality of remote measurement arrangements and a plurality of illuminating arrangements arranged in an array. This also results in a large coverage area. Fig. 2 shows a one-dimensional array but of course the array may also be two-dimensional. The remote measuring apparatus 10 comprises a plurality of remote measuring arrangements 32, 34, 36 each having a respective field of view 320, 340, 360 enabling the measuring of a respective surface 22, 24, 26. The remote measurement arrangements 32, 34, 26 each have corresponding illuminating arrangements 52, 54, 56 emitting projections 520, 540, 560 of visible light, which are projected on the respective measurement surfaces or points 22, 24, 26. The processing means 40 receive the measurements values from all measuring arrangements and control the light emitted by the corresponding illuminating arrangements by means of appropriate control signals. In the embodiment shown in Fig. 2, the remote measurement arrangements 32, 34, 36 and the corresponding illuminating arrangements 52, 54, 56 are intermingled. However, it is also possible to place the remote measurement arrangements 32, 34, 36 together and the illuminating arrangements 52, 54, 56 together. Preferably, the measuring surfaces 22, 24, 26 are adjacent to one another or they are slightly overlapping, in order to obtain a good measurement coverage. Thereto, it may be necessary that the angle of view of the remote measurement sensors 32, 34, 36 is adapted as a function of the distance to the object 10. This could be done manually by the user but preferably the apparatus 10 is enabled to adapt these angles of view, automatically. The apparatus 10 according to Fig. 2 is able to project a light pattern on the object 20 representing measurement values at different measurement surfaces.
In the embodiments described with reference to Figs. 1 and 2, the translation from the measured value into the visible light is executed by processing means loaded with a suitable computer program. However, this translation may also be performed by suitable hardware components.
The applications of the remote measuring apparatus 10 according to the invention are numerous. Some examples of applications will now be described. However, it will be clear to the skilled person that many other applications may be contemplated.
The apparatus could be installed into a building and connected to the internal lighting structure and so allow the building lights to automatically light up to warn of dangerously hot areas, such as a hob and/or cold parts of the room. This could be done in an intuitive way by lighting up hot parts red and cold parts blue.
This concept could be generalized to measuring other properties than temperature: the room lighting could be used to light up places where liquid has been spilled, where there are drug takers, where a gas leak has been detected, etc.
A 'thermal image' could be projected onto an object. This could be a visible light projection that maps the thermal gradient of the object into a visible color spectrum. Hereby, for example a fireman could see the hottest part of a wall or building or an engineer could see the hottest part of a circuit. A combination of remote absorption measurement for detecting the presence of water and a remote temperature measurement for measuring the temperature thereof could be used in for example a street light to highlight ice on the road/pavement. As an alternative to lighting up the ice itself, the presence of ice could be signaled by lighting up the cats-eyes in the road to give early warning for oncoming drivers. A similar application would be an indoor wet/slippery floor warning by lighting up the water.
With more chemicals becoming detectable by absorption spectrum devices more applications of this type could be contemplated. If germs can be seen on a surface then the dirty parts of a kitchen could be lit up.
The apparatus according to the present invention may also be used in the medical field for remotely sensing some body parameter. An example thereof is a thermometer that remotely reads the temperature of the skin and projects the reading back on that particular part of the skin. Similarly, it is possible to use the apparatus according to the present invention for glucose measurement.
The apparatus according to the present invention can also be used for law- enforcement purposes, for example for drug inspections. The apparatus is pointed at will at persons and visible light is projected only on those persons in the possession of drugs. Alternatively, the color of the light may be changed depending on the measurement result. In this way, the law enforcement officer even in crowded areas can easily see which persons are in the possession of drugs and which persons are not.
As another example: the measuring apparatus can be a laser distance measuring device that can measure the distance to an object. The visible light projection could then display the distance to points on the object as numbers. But perhaps more useful would be to highlight the flatness of an object, wall or surface, using either the color or intensity of the visible light or a contour map display to represent on the surface its distance from the user. This is schematically shown in Fig. 3, where the flatness of surface 28 is measured. The distances as indicated by lines w, x, y and z are all measured and can be mathematically be shown to be on a flat surface. The distance indicated by line a however is too short to be on the flat surface, so this part 29 of the surface 28 is determined not to be flat. It may be illuminated in red and the rest of the surface 28 in green. Software processing can be used to cancel out the random changes in distance from the user caused by the user's random movements.
As will be recognized by those skilled in the art, the innovative concepts described in the present application can be modified and varied over a wide range of applications.
Accordingly, the scope of patented subject matter should not be limited to any of the specific exemplary teachings discussed, but is instead defined by the following claims. Any reference signs in the claims shall not be construed as limiting the scope thereof.

Claims

CLAIMS:
1. Apparatus (10) comprising : means (30) for remotely measuring a property of an object (20); means (40) for translating a measured value of the property to visible light; and - means (50) for illuminating the object or an area near the object with the visible light.
2. Apparatus (10) according to claim 1 wherein the means (40) for translating are adapted for mapping the measured value to a parameter of the visible light according to a pre- established relationship .
3. Apparatus (10) according to claim 2 wherein the parameter of the visible light is the presence of the visible light.
4. Apparatus (10) according to claim 2 wherein the parameter of the visible light is the flashing of the visible light.
5. Apparatus (10) according to claim 2 wherein the parameter of the visible light is the brightness or intensity of the visible light.
6. Apparatus (10) according to claim 2 wherein the parameter of the visible light is the color of the visible light.
7. Apparatus (10) according to claim 1 wherein the visible light comprises text.
8. Apparatus according to claim 1 wherein the visible light comprises an image.
9. Apparatus (10) according to claim 1 wherein the means for measuring (30) are adapted to sweep the measurement surface in at least one and preferably two directions.
10. Apparatus (10) according to claim 1 wherein the means for measuring comprise a plurality of remote measuring arrangements (32,34,36) for measuring the property of the object (20) at a plurality of surfaces (22,24,26) and wherein the means (40) for translating are adapted for translating the measured values of the property at each of the plurality of surfaces (22,24,26) to respective visible light and wherein the apparatus comprises a plurality of illuminating arrangements (52,54,56) adapted for illuminating the surfaces (22,24,26) or areas near the surfaces (22,24,26) with the respective visible light.
11. Apparatus (10) according to claim 1, wherein the apparatus is a portable device.
12. Lighting system comprising an apparatus (10) according to claim 1.
13. Method comprising the steps of: remotely measuring a property of an object (20); translating a measured value of the property to visible light; and illuminating the object (20) or an area near the object with the visible light.
PCT/IB2008/051247 2007-04-04 2008-04-03 Remote measuring and display WO2008122935A1 (en)

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CN108693874A (en) * 2017-04-12 2018-10-23 鸿富锦精密电子(天津)有限公司 Control system and method for tripod self-propelled vehicle

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