周期与频率的关系：f=1/T。(其中f为频率，T为周期)。 物质在1s内完成周期性变化的次数叫做频率，常用f表示。为了纪念德国物理学家赫兹的贡献，人们把频率的单位命名为赫兹，简称“赫”，符号为Hz
2021-07-06 07:37
TeTechs光纤耦合太赫兹测量套件是TeTechs公司为大学等科研机构量身定制的教学套件，非常适合给学生演示太赫兹的测量效果。学生可进行动手实验，并可以直观的观察太赫兹波形在自由空间
2016-08-10 16:17
（脑控技术丛书）太赫兹科学技术和应用
2020-03-06 08:02
（脑控技术丛书）太赫兹科学技术和应用
2020-03-03 13:21
大多数飞机系统在400赫兹或28伏直流电下使用115伏交流电，飞机电气部件在许多不同的交流和直流电压下工作。大部分航空三相电源采用电压继电器MD6PUVA监控这些设备，然而，在某些飞机上，26伏
2021-12-29 07:37
描述此参考设计基于 LMG1210 半桥 GaN 驱动器和 GaN 功率的高电子迁移率晶体管 (HEMT)，实现了一款数兆赫兹功率级设计。凭借高效的开关和灵活的死区时间调节，此参考设计不仅可以显著
2018-10-17 15:39
原文链接：http://tecdat.cn/?p=7003美国和其他几个国家的交流电流以60赫兹的频率振荡。这些振荡经常会破坏测量值并且必须减去。在存在60 Hz电源线噪声的情况下研究模拟仪器输入端
2021-12-28 08:00
文章中，一个国际研究小组报告称，通过太赫兹复用器首次成功地传输了两个实时视频信号，总数据速率为50 Gb/s，比蜂窝通信网络大约快100倍。随着对无线数据传输速度和容量的需求越来越高，微波信号的传输
2018-08-31 15:58
Several industrial inspection techniques like X-ray scanning and microwave detection have been successfully used in various security applications over the last few decades. For instance, until recently X-ray scanning dominated nondestructive testing (NDT) methods in security screening applications. However, the hazards of ionization radiation combined with relatively high costs have limited widespread use of X-ray scanners in many applications where human health must not be jeopardized. The postal industry is no exception. Unmediated on-the-spot inspections by postal inspectors remain the most common and effective way to check parcels and envelopes. Quite often such inspection is carried out manually without any modern, automated equipment or computer-aided support.TeraSense Group, Inc has developed a brand-new solution for improving the safety at postal offices and eliminating health hazards for clients and postal workers. We offer the Terahertz High-Speed Imaging Scanner, which is based on our key innovative component: our Ultrafast Terahertz Imaging Camera with image acquisition rates up to 5,000 lines per second. Thanks to its highly sensitive sensor array, we can now bring health and safety measurements in the postal industry to a new level.TeraSense THz scanners have relatively low costs and offer extremely high operating speeds compared with X-ray and microwave techniques. That makes Terahertz waves a suitable and effective security screening solution for use in the postal industry.KEY SPECIFICATIONSTERAHERTZ IMAGINGFOR MAIL AND PARCEL SCREENINGADVANTAGES OF THE THz IMAGING SYSTEM• Powerful tool for prevention of terrorist attacks• Effective tool for revealing drug traffickers • Ability to detect undeclared items in a parcel or envelope• Extremely high throughput capacity due to high imaging speeds• Nondestructive and hazard-free inspection• Low-cost solutionTHz IMAGING CAMERA• Operating frequency: 100 GHz• Image acquisition rate: up to 5000 lines per second• Number of pixels (scalable): 256 x 1 • Field of view (coverage area): 384 x 3 mm2 • Pixel size: 1.5 x 3 mm• Spatial resolution: 3 mm• Fits conveyor belt running speed up to 15 m/s• Original software: TeraFast®Viewer • Interface: mini-USB• Power supply: 24V/20WTHz SOURCE: • Operating frequency: 100 GHz• Power per pixel: 140 µW• Reflection beam-forming optics• Protective isolator for enhanced stabilityHight Speed LinearTerahertz Scannerwith Type II THz SourceSystem set upAnother important application of the Terahertz Scanner is the detection of items that terrorists might send by mail, for example: Traffickers deliver drugs using ordinary mail services, and they often get away with it. Such “supply chains” may stay unrevealed for years because security inspection in postal facilities is performed manually and relies on the professionalism of postal inspectors. Unfortunately, manual inspection is often not enough.This situation can be changed entirely thanks to our Terahertz High-Speed Imaging Scanner — our new security screening system for postal offices. Now it is possible to check envelopes and parcels at industrial conveyor rates (up to 15m/s) and detect substances like the ones listed below: • Marijuana and similar plants• Cocaine• Liquid substancesPostal inspectors can detect such items in real time and on the spot while the conveyor belt is running. It works even if the amount of drugsin a parcel is just a few grams.It is essential that our scanner can detect various types of items inside parcels and envelopes without disturbing their integrity. It is important for postal inspectors to check if the content of the parcel matches the customs declaration. Our Terahertz Scanneris an optimal solution for this application. Terahertz waves are harmless not only to the human body but also to technology. This property will safely allow postal staff to ignore warning labels like “Caution, do not X-ray” and check such parcels like any others.The Terahertz High-Speed Imaging Scanner can be deployed in minutes and does not require any special qualifications to operate. In addition, our scanner is estimated to be cheaper than existing solutions on the market.THz images of sachets of tobacco (5 g, 3 g, 1 g) in envelopes5 g 3 g 1 gA dummy bomb in a boxTHz image of a sachetof flour in an envelopeDETECTION OF UNDECLARED ITEMS• Explosives and their components • Poison• Biological weapons (anthrax and others)TERRORISM PREVENTIONMAIL SCREENING FOR DRUG DETECTIONA sachet of tobacco (3 g)A sachet of flourSome of the most suitable applications of TeraSense THz scanners are listed below.THz image of a dummy bombin a box
2019-10-18 14:00
整理东西整理出了几块RDA5851S模块查了一下相关资料，发现是在车载上用的，还可以进行AT控制看到这里我觉得还好，因为这种可以AT控制的蓝牙模块还是比较常见的，本着试一试的心思，接电源线，想到接功放和喇叭太费事儿，直接连接了一个耳机口，插上耳机，通电蓝牙名称还是很好找的 CAR KIT ，点击蓝牙连接，手机放歌，耳机里传出了声音，一切正常，除了没有蓝牙连接提示音，断开连接提示音。接着用USB转串口接到蓝牙的RX TX上，数据显示乱码，切换波特率，再来。。。.
2022-01-21 14:33
