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	Raster Scan	CS Fourier	Single-pixel	Detector array
acquistion speed (potential)	LOW	⅛ Ï ∣∣∣i⅛∣∣∣∣		REAL-TIME
Receiver requirement	Single-pixel detector	Single-pixel detector	Single-pixel detector	Micro- bolometer array
Source power requirement	LOW	MEDIUM		HIGH
Hardware (comments)	Limit by slow mechanical movements	Limit by slow mechanical movements	Need high- speed SLM	low-sensitivity receivers; need high-power QCL

Figure 6.1 : Comparison of CS imaging systems with raster-scan and detector array
systems. Assuming system implementation with a continuous-wave THz source, the
single-pixel imaging system can provide high-speed imaging at room temperature
with a reasonable hardware requirement.

imaging system will definitely be a suitable alternative to systems using focal plane
detector array for high-speed imaging. A thorough investigation of the source and
receiver characteristics of various THz systems is required to select the appropriate
technology to implement the CS THz imaging system.

6.2.3 Terahertz spectroscopic and phase imaging

One of the major strengths of THz imaging, as compared to optical or infrared imag-
ing, is the capability to obtain spectroscopic and phase information. Spectroscopic
information is useful for identification of materials [52] whereas phase information
provides depth information about the imaged object as in Section 4.4. However, a
THz system with these capabilities usually needs to obtain an entire THz waveform,

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