The SP24 (S1) Outer Tube is a precision fused quartz component engineered with a wall thickness of 2mm to serve as the protective outer sleeve for doped inner tubes in optical measurement systems. Manufactured from high purity fused silica, this outer tube delivers a uniform and compact wall structure that maintains consistent optical performance throughout its service life. With an outer diameter of 43.7mm, an inner diameter of 39.7mm and a total length of 84.8mm, the SP24 (S1) provides generous clearance for housing doped quartz inner tubes while preserving precise alignment of the optical path. The tube is produced through a controlled forming and finishing process that ensures high dimensional precision, making it a reliable structural component for spectrum calibration equipment, optical attenuation assemblies and testing instruments.

• Uniform and compact tube wall: The 2mm wall is formed evenly around the full circumference, providing a dense, void-free structure that supports stable light transmission and mechanical strength.
• Stable optical performance: High purity fused quartz delivers consistent transparency and low internal stress, keeping optical characteristics uniform along the entire 84.8mm length.
• High temperature and corrosion resistance: The quartz body withstands elevated working temperatures and resists attack from moisture, weak acids and common laboratory reagents without degradation.
• High dimensional precision: Outer diameter, inner diameter and length are held within strict tolerances, ensuring accurate fit and alignment in optical assemblies.
• Precision fit with doped inner tubes: The 39.7mm inner bore is matched to accommodate doped quartz inner tubes with minimal clearance, enabling stable combined operation.

The SP24 (S1) fused quartz tube is designed for optical systems that require a reliable protective sleeve with stable mechanical and optical properties. It is widely used in spectrum calibration equipment, where the outer tube houses doped inner tubes and maintains precise alignment of the calibration light path. In optical attenuation components, the tube provides a rigid, thermally stable enclosure that keeps attenuation performance consistent during repeated measurement cycles. The SP24 (S1) also serves as a matching sleeve for testing instruments, protecting sensitive optical elements and ensuring repeatable positioning of the light source and detector. Because the outer tube is manufactured from high purity fused quartz, it can be deployed in demanding laboratory and industrial environments where temperature fluctuation, chemical exposure and long term service are expected.

• Strict tolerance control: Every tube is dimensionally verified during production, guaranteeing consistent fit and dependable assembly performance.
• Match well with doped inner tubes: The precisely machined bore works seamlessly with samarium doped inner tubes, forming a complete optical assembly with stable absorption behavior.
• No impurity precipitation under high temperature: The high purity quartz matrix remains clean under thermal stress, preventing contamination of the optical path and preserving measurement accuracy.
• Long service life: The combination of thermal resistance, chemical stability and mechanical precision gives the SP24 (S1) a long working life with minimal maintenance.