Home All Products TSCM Equipments Non-Linear Junction Detectors
Non-Linear Junction Detectors (NLJDs)
Detects all types of electronics - whether active
passive or even switched off.
Non-Linear Junction Detectors Technology Technical Support All-nation Coverage
Product List
Technology
Detect Dormant Devices
Detects all types of electronic devices - whether active, passive, or even turned off.
Intelligent Analysis
uses intelligent algorithms to analyze detected signals from the second and third harmonic receivers and assess the probability that the material is detected as "silicon" or "metal."
High Ultra-Sensitive
Sensitivity: Can detect the latest NANO SIM cards at distances up to 20 cm.
Introduction
Non-linear junction detectors detect the presence of semiconductor circuits used in all modern electronic devices (such as mobile phones, tracking devices, listening devices, hidden cameras, digital recorders, SIM cards, etc.). Importantly, these detectors will identify these devices whether they are turned on and in use, turned on but in standby mode, or even turned off with no power.
Principle
Non-linear junction detectors use semiconductor electronic components to detect all modern electronic products made with silicon substrates. When a high-frequency radio signal passes directly through silicon, it produces a strong second harmonic frequency of that radio signal. Other materials, such as certain bimetals or oxidized metals, can respond to third harmonic signals. A highly sensitive receiver will respond to any signals produced on the second harmonic, even the smallest silicon chips used in SIM cards, mobile phones, eavesdropping devices, recorders, hidden cameras, etc. Importantly, these devices do not need to be in use, on standby, or even connected to any power to be detected. The third harmonic receiver serves as a valuable confirmation for signals that may not be clear or pose no threat, such as those in oxidized metals and bimetals.
Solution
On the Non-Linear Junction Detector page, we showcase all types of non-linear junction detector products, including products with different detection ranges, functionalities, and designs. We can also customize non-linear junction detectors for non-standard frequency bands based on your requirements. Additionally, we offer OEM/ODM services, and you can choose from handheld, fixed, or backpack non-linear junction detectors to meet different usage scenarios.
Applications
Suitable for all types of confidential locations, including government agencies, military bases, corporate meeting rooms, luxury hotels, conference centers, sensitive R&D lab secure meeting rooms, interrogation rooms, and more. These devices ensure information security and environmental confidentiality by detecting and locating hidden wireless eavesdropping devices and unauthorized wireless signals. They are also widely used in large examinations, theaters, and other venues.
Full Functionality
Non-linear junction detectors can be used alone or in conjunction with wireless signal detectors, phone inspection devices, audio jammers, and signal jamming equipment, enabling comprehensive Technical Surveillance Countermeasures (TSCM) investigations.
Press Release
Globalized Logistic Network
SZMID is developing a worldwide logistics network along the way as the business growing. Five warehouses located in 5 main ports were built to cover Europe, America, Middle East and Asia.
4 warehouses

Covering Europe, America,

Middle East and Asia

29million

pcs shipment in 2023

Massive production capacity | Automated warehousing
Automatic operation, less manpower, material resources or storage space. Professional material management: efficient material storage and sorting.
Semi-automatic three-dimensional shelves
WMS system control
ESD and temperature and humidity control
Open Cooperation with Global Partners
We partner with industry leaders in respective areas to offer the best products and solutions to our customers.

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