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The figure shows how correctness, precision and accuracy are related. The red dots represent successive measurements from a sensor, while the target indicates the correct value. If the measured values are far apart and far away from the target, this indicates a low precision and correctness. Ideally, measurements should be correct and accurate, meaning they are close together and within the target range.

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ToF sensors have no blind spot. Objects can be detected below the setting range and the sensor switches, but cannot provide any measurement results.

Exacom’s involvement with NENA’s i3 specification and NG 9-1-1 started long before NG 9-1-1 and i3 entered the public safety space. We’ve been working on NG 9-1-1 from the beginning and continue to help develop and expand this important effort.

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Time-of-flight laser distance sensors achieve high measuring ranges of up to 10 m on objects and 100 m on reflectors. Triangulation laser distance sensors, on the other hand, is very accurate. However, the measuring range is restricted to max. 1,000 mm. Various settings can be made to optimize the accuracy of the sensors for distance measurement depending on the application. This means that the accuracy can be further increased by filter functions.

The term laser stands for Light Amplification by Stimulated Emission of Radiation. A laser beam can be generated over a wide range of the optical spectrum. In simple terms, this means that directed light waves are bundled into a beam in high concentration.

NENA is working to upgrade 9-1-1 architecture throughout the USA and Canada to their i3 standard. This will help improve communications in an increasingly mobile society. As new types of data come in regarding emergency events, interactions need to be logged, synthesized, and put into context so that first responders can do their jobs efficiently.

Precision, also known as repetition accuracy, can be determined by successive measurements under consistent conditions. A very precise value therefore delivers almost constant measurements. The precision of a sensor is quantified by reproducibility.

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The CMOS line is a light-sensitive receiving element with a large number of pixels. It is used to evaluate the position at which the laser light hits the line. The electrical charge in the pixels of the CMOS sensors (Complementary Metal-Oxide Semiconductor) is converted into a voltage. The position of the object can be determined based on the light distribution on the CMOS line.

Sensors that operate according to the triangulation principle have a so-called blind spot. This is dependent on the distance from which the reflected light meets the receiving element (CMOS line). If the reflected light does not hit the CMOS line, no measurement can be taken. The blind spot is below the working range and means that objects located in this area are not detected and no measured values are output.

wenglor’s laser distance sensors work with red or blue laser light. Whether red or blue light is used depends on the application. Red laser light has a wavelength of 650 nm. Blue lasers work with a wavelength of 405 nm and therefore have a shorter wavelength. This means that the blue laser beam penetrates less deeply into the object to be measured and delivers precise and stable results. Glowing surfaces in particular are not affected by the blue laser. Laser distance sensors with blue diode are very well suited for organic surfaces, polished metals, shiny plastic surfaces or dark paints.

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Exacom’s solutions are compliant with NENA’s i3 standard. Any system leveraging i3 can be recorded on our platform. Exacom’s NENA NG 9-1-1 i3 logging recorders capture a wide array of media and pull them together in a unified interface where incidents can quickly and accurately be reconstructed.

Starting pointA distance measurement is carried out and the maximum possible deviation is determined. It is always measured on the same object to rule out color errors. The ambient temperature may vary by 10 °C.Values from the data sheet:

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Correctness is a qualitative value. It is defined by linearity deviation, temperature drift, switch-on drift and switching distance deviation.

Laser classes provide information on the potential hazard of the laser to humans. Sensors with laser light are divided into different laser classes according to EN 60825-1 depending on the degree of danger. A distinction is made between the common laser classes 1, 2, 2M, 3R and 3B. wenglor laser distance sensors only use laser classes 1 and 2, which are safe for the human eye. More about laser classes

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The ToF (Time-of-Flight) laser sensors for distance measurement combine reproducible measurement results, reliability and a large measuring range. This makes them suitable for a variety of applications at distances of up to one hundred meters with reflectors or ten meters to objects.

Real-Time Text (RTT) technology, which happens via Message Session Relay Protocol (MSRP), allows consumers to send/receive text characters as they are typed, as well as other simultaneous media like voice and video.

Laser sensors are photoelectronic sensors and, thanks to their contactless measuring principle and high accuracy, are well-suited to object detection, path, position and distance measurement. wenglor laser distance sensors work according to the transit time measurement principle and use laser triangulation. In both procedures, distances are measured with laser light and output as a distance value.

Exacom integrates with multiple industry partners to record i3 audio and related metadata, via the SIPREC protocol. All audio and metadata is available in the recorder for archive, search and replay. Recordings can be transcribed, redacted & more.

A major part of NENA’s NG9-1-1 i3 Standard is the ability for PSAPs to receive text-to-911 (SMS) messages. It is based on the SMS (Short Message Service) protocol but adds additional features such as the ability to send location information.

Laser classes provide information on the potential hazard of the laser to humans. Sensors with laser light are divided into different laser classes according to EN 60825-1 depending on the degree of danger. A distinction is made between the common laser classes 1, 2, 2M, 3R and 3B. wenglor laser distance sensors only use laser classes 1 and 2, which are safe for the human eye. More about laser classes

Industrial Ethernet is a generic term for all Ethernet standards for real-time data transmission between the control and sensor. Industrial Ethernet protocols include, for example, EtherCAT, Ethernet/IP or PROFINET.