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PIR325 の電気的特性と機能

PIR325のメーカーはGlolab Corporationです、この部品の機能は「pyroelectric infrared sensor」です。


製品の詳細 ( Datasheet PDF )

部品番号 PIR325
部品説明 pyroelectric infrared sensor
メーカ Glolab Corporation
ロゴ Glolab Corporation ロゴ 




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PIR325 Datasheet, PIR325 PDF,ピン配置, 機能
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INFRARED PARTS
MANUAL
PIR325
FL65
GLOLAB
CORPORATION

1 Page





PIR325 pdf, ピン配列
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Infrared Radiation_____________
Infrared radiation exists in the electromagnetic spectrum at a wavelength that is longer than
visible light. Infrared radiation cannot be seen but it can be detected. Objects that generate heat
also generate infrared radiation and those objects include animals and the human body whose
radiation is strongest at a wavelength of 9.4µm.
Pyroelectric Sensors_____________
The pyroelectric sensor is made of a crystalline material that generates a surface electric charge
when exposed to heat in the form of infrared radiation. When the amount of radiation striking the
crystal changes, the amount of charge also changes and can then be measured with a sensitive
FET device built into the sensor. The sensor elements are sensitive to radiation over a wide
range so a filter window is added to the TO5 package to limit incoming radiation to the 8 to
14µm range which is most sensitive to human body radiation.
Figure 1 shows how typically, the FET source terminal pin 2 connects through a pulldown
resistor of about 100 K to ground and feeds into a two stage amplifier having signal conditioning
circuits. Each of the two cascaded stages has a gain of 100 for a total gain of about 10,000. The
amplifier is typically bandwidth limited to below 10Hz to reject high frequency noise and is
followed by a window comparator that responds to both the positive and negative transitions of
the sensor output signal. A well filtered power source of from 3 to 15 volts should be connected
to the FET drain terminal pin 1.
The PIR325 sensor has two sensing elements connected in a voltage bucking configuration.
This arrangement cancels signals caused by vibration, temperature changes and sunlight. A
body passing in front of the sensor will activate first one and then the other element as shown in
figure 2 whereas other sources will affect both elements simultaneously and be cancelled. The
radiation source must pass across the sensor in a horizontal direction when sensor pins 1 and 2
are on a horizontal plane so that the elements are sequentially exposed to the IR source.
Figure 3 shows the PIR325 electrical specifications and layout in its TO5 package. Please note
that the distance from the front of the sensing elements to the front of the filter window is 0.045
inch (1.143mm). Figures 4 and 5 describe a Fresnel lens designed to be used with the PIR325
sensor.
Figure 6 shows a typical application circuit that drives a relay. R10 and C6 adjust the amount of
time that RY1 remains closed after motion is detected. When used with a PIR325 sensor and
FL65 Fresnel lens, this circuit can detect motion at a distance of up to 90 feet.
Figure 7 shows an application circuit that will indicate the direction that an infrared radiating
source is moving.
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PIR325 電子部品, 半導体
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Fresnel Lens_____________
A Fresnel lens is a Plano Convex lens that has been collapsed on itself as in figure 5 to form a
flat lens that retains its optical characteristics but is much smaller in thickness and therefore has
less absorption losses.
PLANO CONVEX
FRESNEL
FIGURE 4
The FL65 Fresnel lens is made of an infrared transmitting material that has an IR transmission
range of 8 to 14 µm that is most sensitive to human body radiation. It is designed to have its
grooves facing the IR sensing element so that a smooth surface is presented to the subject side
of the lens which is usually the outside of an enclosure that houses the sensor.
The lens element is round with a diameter of 1 inch and has a flange that is 1.5 inches square.
This flange is used for mounting the lens in a suitable frame or enclosure. Mounting can best
and most easily be done with strips of Scotch tape. Silicone rubber adhesive can also be used
to form a more waterproof seal.
The FL65 has a focal length of 0.65 inches from the lens to the sensing element. It has been
determined by experiment to have a field of view of approximately 10 degrees when used with a
PIR325 Pyroelectric sensor. Figure 6 shows the lens dimensions.
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部品番号部品説明メーカ
PIR325

pyroelectric infrared sensor

Glolab
Glolab
PIR325

pyroelectric infrared sensor

Glolab Corporation
Glolab Corporation


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