تقنية الرادار في مستشعرات مستوى الرادار

مقدمة

Radar technology is one of the core sensing technologies driving modern industrial level measurement. Unlike traditional contact-based measurement methods, radar technology uses microwave electromagnetic waves to perform non-contact distance detection, allowing level sensors to operate reliably under high temperature, high pressure, vapor, foam, condensation, and dusty industrial conditions.

The true value of radar level sensors does not come from the instrument itself, but from the continuous evolution of radar microwave technology. Different radar frequencies, antenna structures, signal processing methods, and microwave focusing technologies directly determine the sensor’s measurement capability, anti-interference performance, blind zone size, and environmental adaptability.

As radar technology has evolved from early low-frequency microwave systems to today’s high-frequency 80 GHz and 120 GHz radar architectures, industrial level sensing has entered a new stage of intelligent high-resolution measurement.

1. History and Development of Radar Technology

Radar technology originated from electromagnetic wave research in the late 19th century. During World War II, radar systems were rapidly developed for military detection and navigation applications. Microwave transmission, antenna design, and radio signal processing technologies advanced significantly during this period.

After the war, engineers gradually recognized that radar microwave reflection principles could also be used for industrial distance and level measurement.

Early industrial radar systems introduced in the 1960s and 1970s mainly used relatively low microwave frequencies and large horn antennas. Although these systems provided stable long-distance measurement, they had limited resolution and poor obstacle suppression capability.

The development of semiconductor electronics and microwave integrated circuits in the 1980s and 1990s enabled industrial radar sensors to become more compact and commercially practical. Companies such as سيمنز, فيجا, إيمرسون, و إندريس+هاوزر played major roles in advancing intelligent radar level sensing technologies.

The industry later evolved from traditional 6 GHz and 26 GHz radar technologies toward modern 80 GHz and emerging 120 GHz high-frequency radar systems. This transition fundamentally improved:

• قدرة تركيز الحزمة الضوئية
• دقة الإشارة
• تجنب العوائق
• قياس الخزان الصغير
• تقليل المناطق العمياء
• الكشف عن الصدى الضعيف

At the same time, higher-frequency radar technologies introduced new engineering challenges related to condensation, antenna contamination, and microwave attenuation.

2. Core Technical Principle of Radar Technology

Radar level sensing technology operates based on microwave electromagnetic wave reflection.

The radar sensor emits high-frequency microwave signals toward the material surface. When the microwave signal reaches the medium surface, part of the signal energy is reflected back to the antenna. The system analyzes the reflected signal characteristics to calculate the distance between the antenna and the target surface.

The basic radar ranging principle is:

d=ct/2​

أين:

• $d$ = distance
• $c$ = سرعة الضوء
• $t$ = microwave signal travel time

The measured distance is then converted into level information according to tank geometry or reference calibration.

Modern radar level sensors mainly utilize:

• Pulse radar technology
• FMCW radar technology
• High-frequency microwave transmission
• Digital signal processing (DSP)
• Intelligent echo analysis algorithms

Among these technologies, microwave frequency has become one of the most important factors determining overall radar performance.

3. Frequency Evolution of Radar Technology

The evolution of radar frequency technology directly changed the performance characteristics of radar level sensors.

Different frequencies produce different microwave beam angles, penetration capabilities, signal focusing performance, and environmental sensitivities.

4. 26 GHz Radar Technology

26 GHz radar technology was widely used for many years in industrial level measurement and remains important in difficult process conditions.

زاوية الشعاع النموذجية:

• حوالي 8°–10°

ونظرًا لأن زاوية الحزمة واسعة نسبيًا، فإن الرادار الذي يعمل على تردد 26 جيجاهرتز يوفر قدرة اختراق أقوى للموجات الدقيقة.

تُظهر هذه التقنية أداءً جيدًا في البيئات التي تتضمن:

• بخار كثيف
• التكثف
• رغوة
• Process buildup
• Sticky media

The lower microwave frequency makes the radar less sensitive to antenna surface contamination such as:

• قطرات الماء
• Condensation crystals
• Material coating
• Antenna fouling

وذلك لأن الموجات الدقيقة ذات الترددات المنخفضة أقل عرضة للامتصاص أو التشتت بفعل الطبقات السطحية الرقيقة.

Technical Advantages of 26 GHz Radar

قدرة اختراق قوية

يمكن للرادار الذي يعمل على تردد 26 جيجاهرتز أن يخترق بشكل أفضل:

• البخار
• التكثف
• طبقات الرغوة

making it suitable for difficult process vessels.

تحمل أكبر لتلوث الهوائي

تظل إشارة الرادار مستقرة نسبيًا حتى في الحالات التالية:

• يتكثف الماء على الهوائي
• تتراكم المواد اللاصقة
• Process crystallization occurs

وهذا يعزز الاستقرار التشغيلي على المدى الطويل.

Technical Limitations of 26 GHz Radar

The relatively large beam angle also introduces limitations.

نظرًا لأن حزمة الموجات الدقيقة تنتشر على نطاق أوسع، فإن الرادار يتأثر بسهولة أكبر بما يلي:

• جدران الخزان
• Internal ladders
• المحرضون
• الأنابيب
• الدعامات الهيكلية

This can produce false echoes and unstable readings in narrow or complex vessels.

بالإضافة إلى ذلك:

• Blind zones are generally larger
• Small tank measurement is more difficult
• Obstacle suppression capability is weaker

5. 80 GHz and 120 GHz Radar Technology

Modern radar technology has evolved toward much higher microwave frequencies, especially 80 GHz and the latest 120 GHz radar systems.

زاوية الشعاع النموذجية:

• حوالي 1°–4°

تسمح الموجات الدقيقة ذات الترددات العالية بتركيز الحزمة بشكل ضيق للغاية.

هذا يتحسن بشكل كبير:

• Target accuracy
• Echo resolution
• تجنب العوائق
• Small target detection

The narrow microwave beam enables radar sensors to “look” directly at the target surface while avoiding surrounding structures.

Technical Advantages of 80 GHz / 120 GHz Radar

زوايا شعاع ضيقة للغاية

يمكن للرادار عالي التردد تجنب ما يلي بسهولة:

• المحرضون
• الأنابيب الداخلية
• Tank supports
• Vessel obstacles

This greatly improves measurement reliability in complex tanks.

مناطق عمياء صغيرة جدًا

يتيح الرادار ذو التردد العالي تقليص حجم المناطق الميتة بالقرب من الهوائي.

وهذا يسمح بذلك:

• حجم خزان أكبر قابل للاستخدام
• تحسينات في تطبيقات الخزانات الصغيرة
• Better top-mounted installation flexibility

قدرة قوية على مقاومة التداخل

The focused microwave beam reduces unwanted reflections from surrounding structures.

هذا يتحسن:

• Signal clarity
• Echo discrimination
• الكشف عن الانعكاس الضعيف
• قدرة قياس الغبار

يُظهر الرادار عالي التردد أداءً ممتازًا بشكل خاص في تطبيقات المواد البودرية والصلبة السائبة.

6. Technical Challenges of High-Frequency Radar

Although 80 GHz and 120 GHz radar technologies provide major performance advantages, they also introduce new engineering challenges.

High-frequency microwaves are significantly more sensitive to antenna surface conditions.

Sensitivity to Condensation and Water Films

يمكن بسهولة:

• ممتص
• متفرقة
• مُخفَّف

بواسطة طبقات سطحية رقيقة مثل:

• قطرات الماء
• أغشية التكثيف
• بقايا متبلورة
• تراكم المواد اللزجة

This occurs because higher-frequency microwaves interact more strongly with small surface irregularities and moisture layers.

As a result, antenna contamination becomes much more critical in high-frequency radar systems.

Increased Antenna Surface Requirements

Modern 80 GHz and 120 GHz radar systems require:

• Cleaner antenna surfaces
• Better condensation control
• Improved antenna materials
• Optimized sealing structures

to maintain long-term measurement stability.

7. How Radar Frequency Technology Enables Instrument Functions

Radar frequency technology directly determines the capabilities of radar level sensors.

Lower Frequency Radar Enables Stronger Environmental Tolerance

26 GHz radar technology enables:

• Better steam penetration
• Stronger condensation resistance
• Improved foam tolerance
• Better dirty process adaptability

This makes it suitable for harsh process industries.

High-Frequency Radar Enables Precision Measurement

80 GHz and 120 GHz radar technologies enable:

• Ultra-narrow beam focusing
• Small blind zones
• High-resolution echo analysis
• Complex tank obstacle avoidance

This significantly improves intelligent measurement capability.

DSP and Intelligent Algorithms Enable Stable Signal Processing

Modern radar systems combine microwave technology with:

• Digital signal processing
• قمع الصدى الزائف
• Dynamic gain adjustment
• Intelligent filtering
• تحسين الإشارات التكيفي

These technologies greatly improve operational stability under complex industrial conditions.

8. Industry 4.0 Evolution of Radar Technology

In the Industry 4.0 era, radar technology itself has undergone major technological evolution.

لم تعد عملية التحديث تقتصر على قدرات الاتصال فحسب، بل تشمل بنية الاستشعار الراداري بأكملها.

Evolution Toward Intelligent Microwave Processing

Modern radar systems now integrate:

• High-speed DSP chips
• FPGA processing architectures
• Real-time echo computation
• تحليل الإشارات بمساعدة الذكاء الاصطناعي

This allows radar sensors to dynamically optimize measurement quality.

AI-Based Echo Recognition Technology

Modern radar technologies increasingly use intelligent algorithms capable of:

• Identifying false echoes
• Learning tank reflection characteristics
• Automatically suppressing interference
• Improving unstable surface measurement

AI-assisted radar analysis is becoming especially important for:

• الأسطح الرغوية
• السوائل المضطربة
• المواد المسحوقة
• المواد الصلبة السائبة غير المنتظمة

التكامل بين السحابة وإنترنت الأشياء الصناعية

Modern radar technologies now support:

• التشخيص عن بُعد
• مراقبة السحابة
• حوسبة الحافة
• أنظمة التوأم الرقمي
• الصيانة التنبؤية

تتطور مستشعرات الرادار من أجهزة قائمة بذاتها لتصبح عقد بيانات صناعية ذكية.

9. Future Development Trends of Radar Technology

Future radar technologies will continue evolving toward:

• أنظمة الموجات الدقيقة ذات الترددات العالية
• AI-driven signal optimization
• Autonomous diagnostics
• Self-calibration technologies
• ذكاء الحافة
• Wireless radar sensing
• تكامل التوأم الرقمي

قد تتمكن أنظمة الرادار المستقبلية من التكيف ديناميكيًا:

• طاقة الميكروويف
• كسب الإشارة
• تصفية الصدى
• Frequency response

according to changing process conditions.

AI-assisted radar technologies may eventually allow sensors to autonomously learn tank environments and continuously optimize measurement performance without manual configuration.

الخاتمة

The evolution of radar level sensors is fundamentally driven by the evolution of radar microwave technology itself.

Different radar frequencies directly determine:

• Beam angle
• Penetration capability
• Blind zone size
• إزالة العوائق
• القدرة على التكيف مع البيئة
• استقرار الإشارة

26 GHz radar technology remains valuable for harsh process environments involving vapor, condensation, and antenna contamination, while 80 GHz and emerging 120 GHz radar technologies provide superior focusing capability, smaller blind zones, and stronger anti-interference performance.

As Industry 4.0 technologies continue advancing, radar sensing technology is rapidly evolving toward intelligent, AI-assisted, high-frequency sensing architectures capable of delivering highly stable and autonomous industrial level measurement.