Human proximity sensor in the use of ATM monitoring

1. Overview

Human proximity sensors also called contactless proximity sensors, is the ideal electronic switch quantity sensor.

When the metal detection of proximity sensor of induction area, switch to non-contact, no pressure, no electrical spark, prompt, accurate issued directive reactions out of position and movement of bodies, even if for general travel journey control, positioning accuracy, operating frequency, service life and ease of installation and adjustment and the harsh environment of suitable capacity, is the General mechanical limit switch can not be compared. It is widely used in machine tools, metallurgical, chemical, textile and printing industries. In the automatic control system can be used as a limit, count, positioning control and automatic protection. Proximity sensor with long life, reliable work, repeat positioning accuracy is high, without mechanical wear, no spark, no noise, vibration-resistant ability and so on. So far, close to the sensor range of increasingly widespread, their own development and innovation of speed is extremely fast.

Human proximity sensor as a security means has gradually been recognized and applied.

In order to better carry out GB/T10488-1997 human proximity sensors for the successful implementation of national standards, so that more people understand the principle of human proximity sensors and applications, are combined with Nanjing yuantuo technology development and production of human proximity sensors to introduce the human proximity sensor principle and application of basic knowledge.

Human proximity sensors in ATM cash machine monitoring:

ATM dedicated human proximity sensor YTMW8631 and human activity monitor YT-EWS, one used to detect human body close to the controller, you can accurately ascertain the near vicinity of character is currently used as alarm and status detection.

Sensing part on attachment figures move has high detection sensitivity, and on the surrounding environment of a sound signal suppression, has a strong anti-interference ability of engaging, can be widely used in ATM, insurance, etc of anti-theft device, easy to install, can be installed horizontally or vertically. On the human body sensors sensitivity adjustable in the city, which makes human proximity sensors can adapt to many different occasions.

Widely used in finance, Commerce, self-service banking, ATM monitoring human proximity alarm, etc.

Internal use of micro-chips for program-controlled processing with high detection sensitivity and reliability of the detection and control fires two parts into one, watch low power consumption, switch signal output, direct trigger alarm video recording, easy to use.

Available features:

(1) through walls and non-metal doors and Windows features that apply to Bank ATM monitoring system concealed built-in installation;

(2) detection of human proximity distance adjustable, adjustable RADIUS (approx) 0-5 m;

(3) the detection area is dual-fan-shaped, large range of coverage of space;

(4) the detection signal amplitude and width double comparison, false positive small;

(5) there is a high performance environment temperature adaptation, at-20 to 50 degrees c shall not affect the detection sensitivity.

(6) the non-contact detection.

(7) are not affected by temperature, humidity, air, noise, dust, light effects, such as suitable for harsh environment.

(8) a strong resistance to radio-frequency interference.

2. the extension technology to human proximity sensor of classification and structure

2.1 two-wire proximity sensor

Two-wire proximity sensor simple installation, easy wiring; broader application, but residual voltage and leakage current shortcomings.

2.2 DC 3-wire

DC 3-wire proximity sensor output NPN and PNP type two, 70s Japan products the vast majority are NPN outputs, NPN, PNP Western Europe both output type.

PNP output proximity sensor in the general application of PLC or computer as control directive more, NPN output proximity sensors used to control DC relay more, in practice, according to the characteristics of the control circuit to select the output format.

3 proximity sensor selection and testing

For different materials testing body and different detection distance, should use a different type of proximity sensors to make it in the system with high cost performance, as this selection should observe the following principles:

3.1 when testing body for metal material, should use high-frequency oscillation type proximity sensors, the type proximity sensors on iron, nickel, A3 steel class testing in detecting the most sensitive.

On aluminum, brass and stainless steel class detection, its detection sensitivity is low.

3.2 when testing body for non-metallic materials, such as; wood, paper, plastic, glass and water, and so on, should use capacitive proximity sensors.

3.3 metal body and metal to make long distance detection and control, you should use photoelectric type proximity sensor or ultrasonic type proximity sensors.

Let's look at the way the video trigger, many manufacturers now use the "motion detection" as triggering the alarm recording of typical way, then we simply examine, ATM location for most installations are facing the street, the street traffic, traffic flow through interest, then the motion detection in this almost didn't play a little role, thus giving rise to a large number of invalid junk video file, the resulting consequences is a bunch of garbage video, find it difficult, hard drive for an extended period of time does not stop working to accelerate its damage.

Next, we will follow a transaction volume of good ATM network, per site per day 200 deal of cases from the above data can be seen, by motion detection as the video trigger, invalid video proportion is very great, look at the video very inconvenient, instead of through human activity monitor to trigger the video and almost eliminate invalid video production, for the future-watch video recordings, computer forensics are very convenient.

Yuantuo technology human proximity sensor

Sensilla works?

① human proximity sensors have a high-frequency transmitter, makes the issue of high-frequency magnetic field coil.

② the measured object close to high-frequency magnetic field causes the detected object surface produce Eddy current and Eddy current and magnetic field induced in the opposite direction.

③ sending machine caused by eddy currents from magnetic field effects of cancellation and stop motion.

④ there through the vibration of the control output ON/OFF.

Among the various types of switches, there is a way to close it objects have the ability to "perception" of components — displacement sensor.

Use displacement sensors sensitive to close to objects meet the control switch General characteristics or purpose of the fault, which is close to the switch.

Because the displacement sensor based on different principles and different approaches, and different displacement sensor for object "perception" differently, so common proximity switches include the following:

Eddy current proximity switch, capacitive proximity sensors, photoelectric proximity switch, the Hall into a switch, Pyroelectric proximity switch, the other type of proximity switch

The main use is:

Nanjing yuantuo technology human proximity sensors, human activity monitor in the Bank cash machine trigger control video, aviation, aerospace technology, safe and industrial production has a wide range of applications.

In daily life, such as hotel, restaurant, garage door, automatic hot air machine has application. With regard to the security guard, such as data files, financial accounting, finance, Treasury and other Powerhouse Museum, which is usually installed by various proximity switches consisting of anti-theft devices. In the measurement techniques, such as length, location of measurement; in control technology, such as displacement, velocity and acceleration measurement and control of the use of proximity switches.