Vocabulary sensor

 

(57) Abstract:

Usage: in the field of measuring instruments and more specifically to automatic process control systems of industrial enterprises. The inventive vocabulary sensor includes a common casing 5 pulsed laser emitter 1, the filter 2 at the wavelength of the laser oscillator 1, the lens 3, which is the photodetector 4, the selective amplifier 6 and the oscillator 7. Moreover, the laser beam emitter 1 crosses the main optical axis of the lens 3, and the position of the sensor 4 relative to the lens 3 is selected so that the image spots of the laser light emitter 1 on the object was located within the area of the photodetector 4 only when the object is in a given range of distances to fotoperenosa sensor. 1 Il.

The invention relates to the field of measurement technology and can be used in automatic process control systems of industrial enterprises.

Known vocabulary sensor [1] contains located on opposite sides of the trajectory of the object, the source light beam and the photodetector.

The disadvantage of this fotoperenosa sensor is its low reliability, by which isawanya because of the location of the source light beam and the photodetector on the opposite side of the object.

Also known vocabulary sensor [2] containing in a single case a source of amplitude modulated light radiation in the form of LEDs, collimator, a photodetector, a selective amplifier and oscillator.

The disadvantage of this fotoperenosa sensor is that it also does not provide high reliability. This is due to the influence of extraneous illumination, as well as fuzziness or uncertainty range of distances from the object to the sensor, which is triggered.

The present invention is to improve the reliability fotoperenosa sensor.

This object is achieved in that in Photobacterium the sensor, containing in a single case a source of amplitude modulated light beam, the lens, which is a photodetector, a selective amplifier and oscillator, according to the invention as a source of light radiation is used pulsed laser beam which crosses the main optical axis of the lens, in front of which is a filter at the wavelength of laser radiation, and the position of a sensor relative to the lens is selected so that the image is hen, when the object is in a given range of distances to fotoperenosa sensor.

Comparative analysis of the proposed solutions with the prototype shows that the proposed device is different from the known fact that as the source of light radiation is used pulsed laser beam which crosses the main optical axis of the lens, in front of which is a filter at the wavelength of laser radiation, and the position of a sensor relative to the lens is selected so that the image spots of the laser light emitter on the object was located within the area of the photodetector only when the object is in a given range of distances to fotoperenosa sensor.

Thus, the proposed device complies with the criteria of the invention of "novelty."

The comparison of the proposed solutions not only prototype, but also with other technical solutions in this field of technology is not allowed to reveal to them the distinctive characteristics of the claimed solution, which allowed to conclude that the criterion of "substantial differences".

The claimed solution is shown schematically in the drawing.

Fosti sensor placed in a single housing 5, inside of which are selective amplifier 6 and the oscillator 7.

Elements of the proposed solutions are linked in the following way. The laser emitter 1 emits a beam of coherent monochromatic light, which forms in the presence of an object in the working area of the sensor on the object spot of laser light. Next, using the lens 3, the image of this spot is formed in the plane of the sensitive area of the photodetector. Moreover, the optical filter 2 passes on the photodetector only a laser emitter, diffusely reflected from the object. The photodetector 4 registers this light and generates an alternating electrical signal, amplitude modulated with a pulse repetition rate of the laser oscillator. The signal from the photodetector falls on a selective amplifier and then to the electronics module.

Vocaburary the sensor operates as follows. The beam of the laser oscillator 1 produces at the spot of the laser light, the image is lens 3 is formed on the area of the photodetector 4. Filter 2 cuts stray light with a wavelength different from the laser 1, and a selective amplifier, transport is the changing distance to the object, the image of the spot of light moves in the space of a sensor and there is such a range of distances to the object, within which the image is inside the specified areas of the photodetector. Thus the presence or absence of an object is determined in a fixed range of the distance sensor.

According to the claimed invention, the position of a sensor relative to the lens is selected so that the image of the spot of light on the object was located within the area of the photodetector only when the object is in a given range of distances to fotoperenosa sensor. Calculation fotoperenosa sensor with the following parameters:

The divergence of the laser beam - 1 mrad

The diameter of the laser beam is 1 mm

The distance h between the optical axes of the lens and the laser beam is 40 mm

The angle between the optic axes is 0.02 rad

Lens diameter - 40 mm

The focal length of the lens - 100 mm

The distance from the lens to the site of a sensor - 104 mm

The size of area of the photodetector is 1.5 by 1.5 mm

showed that the distance range in which the image of the spot of laser light is located within the area of the photodetector at a given offset Y2 centre of this area is in the plane of the axes and perpendicular to the axis of the lens, is the following:

Declare vocabulary sensor is implemented as follows. As a laser oscillator is used He-Ne laser radiation power of 5 mW, the modulation of the radiation which is electro-optic modulator. The filter 2 has a bandwidth equal to the wavelength of the laser (0.63 Ám). As the photodetector uses a standard photodiode sensitive area which has a size of 1,5 mm 1,5 mm Lens 3 is a lens with a focal length of 100 mm All parts of the sensor are mounted in a single housing. Moreover, the optical filter, a lens and a photodiode combined in the optical block, which with the adjustment screws can be rotated about the optical axis of the laser emitter.

Due to the fact that in the proposed Photobacterium the sensor optical axis of the lens and the laser emitter is tilted with respect to each other, the distance range in which the detection object has sharp edges defined by the position of a sensor relative to the lens, which in turn increases the reliability of the sensor.

An additional advantage of the proposed fotoperenosa sensor is its high noise immunity fro building the source amplitude modulated light beam, the lens, which is a photodetector, a selective amplifier and oscillator, characterized in that the source of light radiation used pulsed laser emitter mounted with its beam crossing with the main optical axis of the lens, in front of which is a filter with bandwidth equal to the wavelength of the laser emitter and the photodetector is located relative to the lens so that at a given distance range from the object to fotoperenosa sensor formed by the lens, the image spots of the laser light emitter on the object was located within the area of the photodetector.

 

Same patents:

The invention relates to measuring technique and can be used in machine building, ferrous and nonferrous metallurgy in the production of rent, rubber and chemical industry in the manufacture of tubular products without stopping the process

The invention relates to a device for measuring the size of the periodically moving object containing the optoelectronic measuring device that includes a transmitting-receiving elements located in at least one plane changes, perpendicular to the longitudinal axis of the object, and the processing unit, and the plane of the measuring portal is limited by at least two measuring beams arranged at an angle relative to each other

Fiber optic sensor // 2082086
The invention relates to the field of measurement technology, in particular to the field of fiber-optical measuring instruments

The invention relates to measurement devices, namely, devices for measuring the geometric parameters of the shells

The invention relates to measurement techniques, in particular to a method of controlling parameters of objects, and in particular to methods of determining particle sizes, and can be used to determine the size of particles, their size composition and concentration in powders, suspensions, and aerosols

The invention relates to measuring technique and can be used in fiber-optic technology in cable industry in the manufacture of optical fibers and cables, in measurement techniques in the creation and study of fiber-optic sensors, etc

The invention relates to measuring equipment

The invention relates to measuring technique and can be used in machine building, ferrous and nonferrous metallurgy in the production of rent, rubber and chemical industry in the manufacture of tubular products without stopping the process

The invention relates to measuring technique and can be used in machine building, ferrous and nonferrous metallurgy in the production of rent, rubber and chemical industry in the manufacture of tubular products without stopping the process

The invention relates to measuring equipment

The invention relates to a device for measuring the size of the periodically moving object containing the optoelectronic measuring device that includes a transmitting-receiving elements located in at least one plane changes, perpendicular to the longitudinal axis of the object, and the processing unit, and the plane of the measuring portal is limited by at least two measuring beams arranged at an angle relative to each other

The invention relates to the field of optical measurements, namely the displacement interferometers

The invention relates to a measuring and control technique, the technical effect of the invention is to improve performance

The invention relates to measuring equipment

The invention relates to measuring equipment used in electrical engineering, and, in particular, can be used to control the air gap of a synchronous electric machine, such as a hydro generator
Up!