(8801-1)pir fresnel lens for sale, flat pir lens for LED lighting, camera, human detector

1.Manufacture for alcohol Tester 2.OEM for alcohol Tester 3.Transmittance 4.Not easy to deformation 5.The overall appearance

 

 

    The Finel lens is an infrared probe "glasses", it is the human like glasses, with appropriate or not directly affect the use effect, with improper produces misoperation and leakage action, cause an user or developer to lose confidence.With properly and give full play to human body induction effect, make its application domain expands unceasingly.    

     The Finel lens is based on the French light physicist FRESNEL invention principle using electroplating mold technology and PE (polyethylene) of compressed material.Lens (0.5-0.8mm thickness) surface burn a circle by small to big, outward from shallow to deep of concentric circles, from seemingly serrated profile.The ring line and dense induction angle, focal distance away; the loop line recording of deep focus distance, near.Infrared light is close to the concentric rings of light is concentrated and more strong.The same line of several concentric rings to form a vertical induction zone, consisting of concentric rings between a level induction period.Vertical induction zone more perpendicular angle larger lens induction; induction period longer more more horizontal angle of induction.Section number by induction in the human body motion amplitude is small, less is the human body section moving range is big.Different area between two concentric circles are mutually staggered, reduce the section between the blind area.From region to region, between the paragraphs, sections are formed between the blind area.As the lens by the infrared probe field angle constraints, vertical and horizontal angle of induction of finite, lens area is limited.The lens from the appearance of classified as: long, square, circular, from functional classification: single segmental, dual zone multi segment, in section.

    Below is the common lens appearance diagram:

 

    The three district is commonly used multiple lens section, vertical and planar inductive diagram.

  

    When people enter the sensing range, the release of human infrared light through the lens is assembled in the remote area A or middle distance B area or close in area C of a segment of the concentric rings, concentric ring with infrared probe has a proper length, infrared light is to receive the probe, the probe optical signal into an electrical signal into electronic circuit load.The receiving body infrared light is also known as passive infrared moving target detector.

    Lenses are three main colors, a polyethylene materials, color, slightly transparent, light transmittance is good, not easy to deformation.In two, white is mainly used for adapting the shell color.In three, black is used to prevent strong light interference.The lens can also be combined with the appearance of the product color injection, so that the overall product is more beautiful.

    Every lens has a model (with year + series named), lens parameters:    

1,Appearance description -- shape (long, round, square), size (diameter).In millimeters.

2,Detection range -- a lens can detect the effective distance (m) and angle.

3,The focal length of a lens with a probe -- window distance, accuracy in mm decimal point as the   unit.Rectangular and square lens focal length to arc to unit alignment probe window.    

    The lens and the probe with application -- we used is the dual probe, unraveling the filter glass, its interior has two to 7 - 14um infrared wavelengths are particularly sensitive to TO - 5 material connected with the field effect tube.

 

    The static state space infrared light, because the dual probe using complementary techniques, does not produce an electrical output.Under the dynamic conditions, the body through the probe has been A source or by B source induction, Sa\<Sb or Sa>Sb generate a difference, dual-source lose balance and very sensitive to generate output signals, see Map (3C).When the people against the probe is in perpendicular state movement, Sa=Sb does not generate a difference, dual source is very difficult to produce a signal output.Therefore, the detector installation location and direction in parallel to.According to the above principle probe and lens combination can be made into the following induction of human detector.

    A,Single segmental level and single segmental vertical.

  

    Map (4) single segmental level induction angle is large, it is the probe level field of view big cause, forming a rectangular fan induction zone, single segmental level type or level of curtain type induction, this way can avoid the induction of infrared jamming Map (5) single multistage vertical type induction angle is small, the probe vertical field of view angle is small the reason, form a vertical shape fan induction zone, single zone section of vertical type vertical curtain type sensor, the sensing means can avoid or infrared jamming. Map (6) probe and the lens with the match Sa\<Sb or Sa>Sb generate a difference requirements, so the induction is not sensitive.Dual zone concentric circles similar lenses can achieve the curtain type induction effect.Single zone multi segment and double zone multi segment for local induction.

    B,In period of induction and multiple zones of multistage cone type.  

 

    Map (7) is in period of induction type probe with the lens corresponds to the location and detection effect chart, in period of induction type used for wall hanging type mounting, downward tilt detecting three different regions. Map (8) is in a cone induction type, used for ceiling mounted, direct down detection.By dual probe with circular lens induction pattern is not like a cone, because the probe level greater than the vertical angle of view and the Sa=Sb phenomenon, the cone effect diagram will sag intermediate.If the round lens with a four source probe, induction pattern is more like a cone, see Map (8) detecting effect diagram.In period of induction and multiple zones of multistage cone type induction area is wide, much used in large area detection.

  

    Probe and a lens with does not meet the requirements, the left lens to reverse, above right in the middle of lenses arranged in the probe, there were no remote sensing effect, lower blind area increase, not induction phenomenon.  

  

    C,Offbeat detection method.Probe and lens deviation, produce different detection direction and effect.Probe on the detection of partial, downward direction, see below left.Similarly, the probe side, detecting direction.Probe to detect left, right, see below.Similarly, the right direction of detection probe, left.Probe 45 degrees deflection, reduce human activity limited by directions, see below right.Probe and slightly tilted 45 degrees deflection, suitable for detecting long area.    

    D,Enhanced detection sensitivity method.The front has been elaborated in section number by induction in the human body motion amplitude is smaller, thus, selection of section and thick lens can enhance detection sensitivity, body as long as the induction of effective range is effective move slightly.A high density lens in the 50mm length of 26 section of.  

    E,Enhancing anti interference method.From the front of the principle that number, section is less induction in the human body movement is large, a small number of lens selection section can reduce the misoperation, one is the human body movement amplitude to big two is a small number of lens section forming local detection, reduce the external interference source.

 

    Finel (Fresnel) lens system      

    Finel lens effect has two: one is the focusing effect, the pyroelectric infrared signal refraction (reflection) in PIR, second is the detection region is divided into a number of area and a dark area, make into the detection region of the moving object to temperature changes in the form of PIR produce changes in pyroelectric infrared signal.    

    Finel lens, is simply the lens side with equidistant toothed. Through these teeth lines, can be reached on the specified spectral range of the optical band pass (reflection or refraction) role. The traditional grinding optical bandpass optical filters are expensive.The Finel lens can greatly reduce the cost of.A typical example is the PIR (passive infra-red detectors).PIR is widely used in alarm.If you take a have a look, you'll find out in each PIR has a small plastic cap.This is a Finel lens.Small caps are engraved with the internal tooth profile.The Finel lens can be the incident light frequency peak limited to  about 10 microns (human body infrared radiation peak).Fairly low cost.

    Finel lens main role is to detect spatial infrared effectively focus on sensor.Through the distribution in the lens of the concentric band (Windows) used to achieve infrared aggregation, equivalent to the function of convex lens.This part is mainly to see the band selection lens design and lens material.Consideration of lens parameters mainly include: the luminous flux, different lens concentricity, thickness uniformity, the optical axis of the lens and shape the concentricity, transmittance, focal length error.Finel lens narrowband (Windows) design is generally uneven, from top to bottom is divided into several rows above, below, are less dense, sparse, generally intermediate sides.Because the human face, knee, arm infrared radiation is stronger, just in front of the above lens; the less, because the lower body infrared radiation is weak, the two is to prevent small animal surface infrared radiation interference.Generally made of organic glass with.